mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
1137 lines
31 KiB
PHP
1137 lines
31 KiB
PHP
<?php
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/**
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* Implements a "lazy loading" DataObjectSet.
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* Uses {@link DataQuery} to do the actual query generation.
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*
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* DataLists are _immutable_ as far as the query they represent is concerned. When you call a method that
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* alters the query, a new DataList instance is returned, rather than modifying the existing instance
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*
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* When you add or remove an element to the list the query remains the same, but because you have modified
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* the underlying data the contents of the list changes. These are some of those methods:
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*
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* - add
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* - addMany
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* - remove
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* - removeMany
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* - removeByID
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* - removeByFilter
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* - removeAll
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*
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* Subclasses of DataList may add other methods that have the same effect.
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*
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* @package framework
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* @subpackage model
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*/
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class DataList extends ViewableData implements SS_List, SS_Filterable, SS_Sortable, SS_Limitable {
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/**
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* The DataObject class name that this data list is querying
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*
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* @var string
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*/
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protected $dataClass;
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/**
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* The {@link DataQuery} object responsible for getting this DataList's records
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*
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* @var DataQuery
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*/
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protected $dataQuery;
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/**
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* The DataModel from which this DataList comes.
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*
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* @var DataModel
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*/
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protected $model;
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/**
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* Create a new DataList.
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* No querying is done on construction, but the initial query schema is set up.
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*
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* @param string $dataClass - The DataObject class to query.
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*/
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public function __construct($dataClass) {
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$this->dataClass = $dataClass;
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$this->dataQuery = new DataQuery($this->dataClass);
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parent::__construct();
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}
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/**
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* Set the DataModel
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*
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* @param DataModel $model
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*/
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public function setDataModel(DataModel $model) {
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$this->model = $model;
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}
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/**
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* Get the dataClass name for this DataList, ie the DataObject ClassName
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*
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* @return string
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*/
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public function dataClass() {
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return $this->dataClass;
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}
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/**
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* When cloning this object, clone the dataQuery object as well
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*/
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public function __clone() {
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$this->dataQuery = clone $this->dataQuery;
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}
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/**
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* Return a copy of the internal {@link DataQuery} object
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*
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* Because the returned value is a copy, modifying it won't affect this list's contents. If
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* you want to alter the data query directly, use the alterDataQuery method
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*
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* @return DataQuery
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*/
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public function dataQuery() {
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return clone $this->dataQuery;
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}
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/**
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* @var bool - Indicates if we are in an alterDataQueryCall already, so alterDataQuery can be re-entrant
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*/
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protected $inAlterDataQueryCall = false;
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/**
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* Return a new DataList instance with the underlying {@link DataQuery} object altered
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*
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* If you want to alter the underlying dataQuery for this list, this wrapper method
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* will ensure that you can do so without mutating the existing List object.
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*
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* It clones this list, calls the passed callback function with the dataQuery of the new
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* list as it's first parameter (and the list as it's second), then returns the list
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*
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* Note that this function is re-entrant - it's safe to call this inside a callback passed to
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* alterDataQuery
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*
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* @param $callback
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* @return DataList
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*/
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public function alterDataQuery($callback) {
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if ($this->inAlterDataQueryCall) {
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$list = $this;
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$res = call_user_func($callback, $list->dataQuery, $list);
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if ($res) $list->dataQuery = $res;
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return $list;
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}
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else {
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$list = clone $this;
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$list->inAlterDataQueryCall = true;
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try {
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$res = call_user_func($callback, $list->dataQuery, $list);
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if ($res) $list->dataQuery = $res;
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}
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catch (Exception $e) {
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$list->inAlterDataQueryCall = false;
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throw $e;
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}
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$list->inAlterDataQueryCall = false;
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return $list;
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}
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}
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/**
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* Return a new DataList instance with the underlying {@link DataQuery} object changed
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*
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* @param DataQuery $dataQuery
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* @return DataList
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*/
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public function setDataQuery(DataQuery $dataQuery) {
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$clone = clone $this;
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$clone->dataQuery = $dataQuery;
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return $clone;
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}
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/**
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* Returns a new DataList instance with the specified query parameter assigned
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*
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* @param string|array $keyOrArray Either the single key to set, or an array of key value pairs to set
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* @param mixed $val If $keyOrArray is not an array, this is the value to set
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* @return DataList
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*/
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public function setDataQueryParam($keyOrArray, $val = null) {
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$clone = clone $this;
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if(is_array($keyOrArray)) {
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foreach($keyOrArray as $key => $val) {
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$clone->dataQuery->setQueryParam($key, $val);
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}
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}
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else {
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$clone->dataQuery->setQueryParam($keyOrArray, $val);
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}
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return $clone;
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}
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/**
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* Returns the SQL query that will be used to get this DataList's records. Good for debugging. :-)
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*
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* @param array $parameters Out variable for parameters required for this query
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* @param string The resulting SQL query (may be paramaterised)
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*/
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public function sql(&$parameters = array()) {
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return $this->dataQuery->query()->sql($parameters);
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}
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/**
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* Return a new DataList instance with a WHERE clause added to this list's query.
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*
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* Supports parameterised queries.
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* See SQLQuery::addWhere() for syntax examples, although DataList
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* won't expand multiple method arguments as SQLQuery does.
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*
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* @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or
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* paramaterised queries
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* @return DataList
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*/
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public function where($filter) {
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return $this->alterDataQuery(function($query) use ($filter){
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$query->where($filter);
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});
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}
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/**
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* Return a new DataList instance with a WHERE clause added to this list's query.
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* All conditions provided in the filter will be joined with an OR
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*
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* Supports parameterised queries.
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* See SQLQuery::addWhere() for syntax examples, although DataList
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* won't expand multiple method arguments as SQLQuery does.
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*
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* @param string|array|SQLConditionGroup $filter Predicate(s) to set, as escaped SQL statements or
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* paramaterised queries
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* @return DataList
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*/
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public function whereAny($filter) {
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return $this->alterDataQuery(function($query) use ($filter){
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$query->whereAny($filter);
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});
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}
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/**
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* Returns true if this DataList can be sorted by the given field.
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*
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* @param string $fieldName
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* @return boolean
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*/
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public function canSortBy($fieldName) {
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return $this->dataQuery()->query()->canSortBy($fieldName);
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}
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/**
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*
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* @param string $fieldName
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* @return boolean
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*/
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public function canFilterBy($fieldName) {
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if($t = singleton($this->dataClass)->hasDatabaseField($fieldName)){
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return true;
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}
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return false;
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}
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/**
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* Return a new DataList instance with the records returned in this query
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* restricted by a limit clause.
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*
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* @param int $limit
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* @param int $offset
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*/
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public function limit($limit, $offset = 0) {
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return $this->alterDataQuery(function($query) use ($limit, $offset){
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$query->limit($limit, $offset);
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});
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}
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/**
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* Return a new DataList instance with distinct records or not
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*
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* @param bool $value
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*/
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public function distinct($value) {
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return $this->alterDataQuery(function($query) use ($value){
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$query->distinct($value);
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});
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}
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/**
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* Return a new DataList instance as a copy of this data list with the sort
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* order set.
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*
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* @see SS_List::sort()
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* @see SQLQuery::orderby
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* @example $list = $list->sort('Name'); // default ASC sorting
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* @example $list = $list->sort('Name DESC'); // DESC sorting
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* @example $list = $list->sort('Name', 'ASC');
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* @example $list = $list->sort(array('Name'=>'ASC', 'Age'=>'DESC'));
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*
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* @param String|array Escaped SQL statement. If passed as array, all keys and values are assumed to be escaped.
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* @return DataList
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*/
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public function sort() {
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$count = func_num_args();
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if($count == 0) {
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return $this;
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}
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if($count > 2) {
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throw new InvalidArgumentException('This method takes zero, one or two arguments');
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}
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$sort = $col = $dir = null;
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if ($count == 2) {
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list($col, $dir) = func_get_args();
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}
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else {
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$sort = func_get_arg(0);
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}
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return $this->alterDataQuery(function($query, $list) use ($sort, $col, $dir){
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if ($col) {
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// sort('Name','Desc')
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if(!in_array(strtolower($dir),array('desc','asc'))){
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user_error('Second argument to sort must be either ASC or DESC');
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}
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$query->sort($col, $dir);
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}
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else if(is_string($sort) && $sort){
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// sort('Name ASC')
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if(stristr($sort, ' asc') || stristr($sort, ' desc')) {
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$query->sort($sort);
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} else {
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$query->sort($sort, 'ASC');
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}
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}
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else if(is_array($sort)) {
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// sort(array('Name'=>'desc'));
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$query->sort(null, null); // wipe the sort
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foreach($sort as $col => $dir) {
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// Convert column expressions to SQL fragment, while still allowing the passing of raw SQL
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// fragments.
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try {
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$relCol = $list->getRelationName($col);
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} catch(InvalidArgumentException $e) {
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$relCol = $col;
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}
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$query->sort($relCol, $dir, false);
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}
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}
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});
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}
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/**
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* Return a copy of this list which only includes items with these charactaristics
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*
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* @see SS_List::filter()
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*
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* @example $list = $list->filter('Name', 'bob'); // only bob in the list
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* @example $list = $list->filter('Name', array('aziz', 'bob'); // aziz and bob in list
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* @example $list = $list->filter(array('Name'=>'bob, 'Age'=>21)); // bob with the age 21
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* @example $list = $list->filter(array('Name'=>'bob, 'Age'=>array(21, 43))); // bob with the Age 21 or 43
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* @example $list = $list->filter(array('Name'=>array('aziz','bob'), 'Age'=>array(21, 43)));
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* // aziz with the age 21 or 43 and bob with the Age 21 or 43
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*
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* @todo extract the sql from $customQuery into a SQLGenerator class
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*
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* @param string|array Escaped SQL statement. If passed as array, all keys and values will be escaped internally
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* @return DataList
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*/
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public function filter() {
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// Validate and process arguments
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$arguments = func_get_args();
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switch(sizeof($arguments)) {
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case 1: $filters = $arguments[0]; break;
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case 2: $filters = array($arguments[0] => $arguments[1]); break;
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default:
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throw new InvalidArgumentException('Incorrect number of arguments passed to filter()');
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}
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return $this->addFilter($filters);
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}
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/**
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* Return a new instance of the list with an added filter
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*/
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public function addFilter($filterArray) {
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$list = $this;
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foreach($filterArray as $field => $value) {
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$fieldArgs = explode(':', $field);
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$field = array_shift($fieldArgs);
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$filterType = array_shift($fieldArgs);
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$modifiers = $fieldArgs;
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$list = $list->applyFilterContext($field, $filterType, $modifiers, $value);
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}
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return $list;
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}
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/**
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* Return a copy of this list which contains items matching any of these charactaristics.
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*
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* @example // only bob in the list
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* $list = $list->filterAny('Name', 'bob');
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* // SQL: WHERE "Name" = 'bob'
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* @example // azis or bob in the list
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* $list = $list->filterAny('Name', array('aziz', 'bob');
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* // SQL: WHERE ("Name" IN ('aziz','bob'))
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* @example // bob or anyone aged 21 in the list
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* $list = $list->filterAny(array('Name'=>'bob, 'Age'=>21));
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* // SQL: WHERE ("Name" = 'bob' OR "Age" = '21')
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* @example // bob or anyone aged 21 or 43 in the list
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* $list = $list->filterAny(array('Name'=>'bob, 'Age'=>array(21, 43)));
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* // SQL: WHERE ("Name" = 'bob' OR ("Age" IN ('21', '43'))
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* @example // all bobs, phils or anyone aged 21 or 43 in the list
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* $list = $list->filterAny(array('Name'=>array('bob','phil'), 'Age'=>array(21, 43)));
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* // SQL: WHERE (("Name" IN ('bob', 'phil')) OR ("Age" IN ('21', '43'))
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*
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* @todo extract the sql from this method into a SQLGenerator class
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*
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* @param string|array See {@link filter()}
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* @return DataList
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*/
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public function filterAny() {
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$numberFuncArgs = count(func_get_args());
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$whereArguments = array();
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if($numberFuncArgs == 1 && is_array(func_get_arg(0))) {
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$whereArguments = func_get_arg(0);
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} elseif($numberFuncArgs == 2) {
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$whereArguments[func_get_arg(0)] = func_get_arg(1);
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} else {
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throw new InvalidArgumentException('Incorrect number of arguments passed to exclude()');
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}
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return $this->alterDataQuery(function($query, $list) use ($whereArguments) {
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$subquery = $query->disjunctiveGroup();
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foreach($whereArguments as $field => $value) {
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$fieldArgs = explode(':',$field);
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$field = array_shift($fieldArgs);
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$filterType = array_shift($fieldArgs);
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$modifiers = $fieldArgs;
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// This is here since PHP 5.3 can't call protected/private methods in a closure.
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$t = singleton($list->dataClass())->dbObject($field);
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if($filterType) {
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$className = "{$filterType}Filter";
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} else {
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$className = 'ExactMatchFilter';
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}
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if(!class_exists($className)){
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$className = 'ExactMatchFilter';
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array_unshift($modifiers, $filterType);
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}
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$t = new $className($field, $value, $modifiers);
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$t->apply($subquery);
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}
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});
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}
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/**
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* Note that, in the current implementation, the filtered list will be an ArrayList, but this may change in a
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* future implementation.
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* @see SS_Filterable::filterByCallback()
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*
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* @example $list = $list->filterByCallback(function($item, $list) { return $item->Age == 9; })
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* @param callable $callback
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* @return ArrayList (this may change in future implementations)
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*/
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public function filterByCallback($callback) {
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if(!is_callable($callback)) {
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throw new LogicException(sprintf(
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"SS_Filterable::filterByCallback() passed callback must be callable, '%s' given",
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gettype($callback)
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));
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}
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$output = ArrayList::create();
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foreach($this as $item) {
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if(call_user_func($callback, $item, $this)) $output->push($item);
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}
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return $output;
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}
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/**
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* Translates a {@link Object} relation name to a Database name and apply
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* the relation join to the query. Throws an InvalidArgumentException if
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* the $field doesn't correspond to a relation.
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*
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* @throws InvalidArgumentException
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* @param string $field
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*
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* @return string
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*/
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public function getRelationName($field) {
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if(!preg_match('/^[A-Z0-9._]+$/i', $field)) {
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throw new InvalidArgumentException("Bad field expression $field");
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}
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if(strpos($field,'.') === false) {
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return '"'.$field.'"';
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}
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$relations = explode('.', $field);
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$fieldName = array_pop($relations);
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$relationModelName = $this->dataQuery->applyRelation($field);
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return '"'.$relationModelName.'"."'.$fieldName.'"';
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}
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/**
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* Translates a filter type to a SQL query.
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*
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* @param string $field - the fieldname in the db
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* @param string $filter - example StartsWith, relates to a filtercontext
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* @param array $modifiers - Modifiers to pass to the filter, ie not,nocase
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* @param string $value - the value that the filtercontext will use for matching
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* @todo Deprecated SearchContexts and pull their functionality into the core of the ORM
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*/
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private function applyFilterContext($field, $filter, $modifiers, $value) {
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if($filter) {
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$className = "{$filter}Filter";
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} else {
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$className = 'ExactMatchFilter';
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}
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if(!class_exists($className)) {
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$className = 'ExactMatchFilter';
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array_unshift($modifiers, $filter);
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}
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$t = new $className($field, $value, $modifiers);
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return $this->alterDataQuery(array($t, 'apply'));
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}
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/**
|
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* Return a copy of this list which does not contain any items with these charactaristics
|
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*
|
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* @see SS_List::exclude()
|
|
* @example $list = $list->exclude('Name', 'bob'); // exclude bob from list
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* @example $list = $list->exclude('Name', array('aziz', 'bob'); // exclude aziz and bob from list
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* @example $list = $list->exclude(array('Name'=>'bob, 'Age'=>21)); // exclude bob that has Age 21
|
|
* @example $list = $list->exclude(array('Name'=>'bob, 'Age'=>array(21, 43))); // exclude bob with Age 21 or 43
|
|
* @example $list = $list->exclude(array('Name'=>array('bob','phil'), 'Age'=>array(21, 43)));
|
|
* // bob age 21 or 43, phil age 21 or 43 would be excluded
|
|
*
|
|
* @todo extract the sql from this method into a SQLGenerator class
|
|
*
|
|
* @param string|array Escaped SQL statement. If passed as array, all keys and values will be escaped internally
|
|
* @return DataList
|
|
*/
|
|
public function exclude() {
|
|
$numberFuncArgs = count(func_get_args());
|
|
$whereArguments = array();
|
|
|
|
if($numberFuncArgs == 1 && is_array(func_get_arg(0))) {
|
|
$whereArguments = func_get_arg(0);
|
|
} elseif($numberFuncArgs == 2) {
|
|
$whereArguments[func_get_arg(0)] = func_get_arg(1);
|
|
} else {
|
|
throw new InvalidArgumentException('Incorrect number of arguments passed to exclude()');
|
|
}
|
|
|
|
return $this->alterDataQuery(function($query, $list) use ($whereArguments) {
|
|
$subquery = $query->disjunctiveGroup();
|
|
|
|
foreach($whereArguments as $field => $value) {
|
|
$fieldArgs = explode(':', $field);
|
|
$field = array_shift($fieldArgs);
|
|
$filterType = array_shift($fieldArgs);
|
|
$modifiers = $fieldArgs;
|
|
|
|
// This is here since PHP 5.3 can't call protected/private methods in a closure.
|
|
$t = singleton($list->dataClass())->dbObject($field);
|
|
if($filterType) {
|
|
$className = "{$filterType}Filter";
|
|
} else {
|
|
$className = 'ExactMatchFilter';
|
|
}
|
|
if(!class_exists($className)){
|
|
$className = 'ExactMatchFilter';
|
|
array_unshift($modifiers, $filterType);
|
|
}
|
|
$t = new $className($field, $value, $modifiers);
|
|
$t->exclude($subquery);
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* This method returns a copy of this list that does not contain any DataObjects that exists in $list
|
|
*
|
|
* The $list passed needs to contain the same dataclass as $this
|
|
*
|
|
* @param SS_List $list
|
|
* @return DataList
|
|
* @throws BadMethodCallException
|
|
*/
|
|
public function subtract(SS_List $list) {
|
|
if($this->dataclass() != $list->dataclass()) {
|
|
throw new InvalidArgumentException('The list passed must have the same dataclass as this class');
|
|
}
|
|
|
|
return $this->alterDataQuery(function($query) use ($list){
|
|
$query->subtract($list->dataQuery());
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Return a new DataList instance with an inner join clause added to this list's query.
|
|
*
|
|
* @param string $table Table name (unquoted and as escaped SQL)
|
|
* @param string $onClause Escaped SQL statement, e.g. '"Table1"."ID" = "Table2"."ID"'
|
|
* @param string $alias - if you want this table to be aliased under another name
|
|
* @param int $order A numerical index to control the order that joins are added to the query; lower order values
|
|
* will cause the query to appear first. The default is 20, and joins created automatically by the
|
|
* ORM have a value of 10.
|
|
* @param array $parameters Any additional parameters if the join is a parameterised subquery
|
|
* @return DataList
|
|
*/
|
|
public function innerJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) {
|
|
return $this->alterDataQuery(function($query) use ($table, $onClause, $alias, $order, $parameters){
|
|
$query->innerJoin($table, $onClause, $alias, $order, $parameters);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Return a new DataList instance with a left join clause added to this list's query.
|
|
*
|
|
* @param string $table Table name (unquoted and as escaped SQL)
|
|
* @param string $onClause Escaped SQL statement, e.g. '"Table1"."ID" = "Table2"."ID"'
|
|
* @param string $alias - if you want this table to be aliased under another name
|
|
* @param int $order A numerical index to control the order that joins are added to the query; lower order values
|
|
* will cause the query to appear first. The default is 20, and joins created automatically by the
|
|
* ORM have a value of 10.
|
|
* @param array $parameters Any additional parameters if the join is a parameterised subquery
|
|
* @return DataList
|
|
*/
|
|
public function leftJoin($table, $onClause, $alias = null, $order = 20, $parameters = array()) {
|
|
return $this->alterDataQuery(function($query) use ($table, $onClause, $alias, $order, $parameters){
|
|
$query->leftJoin($table, $onClause, $alias, $order, $parameters);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Return an array of the actual items that this DataList contains at this stage.
|
|
* This is when the query is actually executed.
|
|
*
|
|
* @return array
|
|
*/
|
|
public function toArray() {
|
|
$query = $this->dataQuery->query();
|
|
$rows = $query->execute();
|
|
$results = array();
|
|
|
|
foreach($rows as $row) {
|
|
$results[] = $this->createDataObject($row);
|
|
}
|
|
|
|
return $results;
|
|
}
|
|
|
|
/**
|
|
* Return this list as an array and every object it as an sub array as well
|
|
*
|
|
* @return array
|
|
*/
|
|
public function toNestedArray() {
|
|
$result = array();
|
|
|
|
foreach($this as $item) {
|
|
$result[] = $item->toMap();
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Walks the list using the specified callback
|
|
*
|
|
* @param callable $callback
|
|
* @return DataList
|
|
*/
|
|
public function each($callback) {
|
|
foreach($this as $row) {
|
|
$callback($row);
|
|
}
|
|
|
|
return $this;
|
|
}
|
|
|
|
public function debug() {
|
|
$val = "<h2>" . $this->class . "</h2><ul>";
|
|
|
|
foreach($this->toNestedArray() as $item) {
|
|
$val .= "<li style=\"list-style-type: disc; margin-left: 20px\">" . Debug::text($item) . "</li>";
|
|
}
|
|
$val .= "</ul>";
|
|
return $val;
|
|
}
|
|
|
|
/**
|
|
* Returns a map of this list
|
|
*
|
|
* @param string $keyField - the 'key' field of the result array
|
|
* @param string $titleField - the value field of the result array
|
|
* @return SS_Map
|
|
*/
|
|
public function map($keyField = 'ID', $titleField = 'Title') {
|
|
return new SS_Map($this, $keyField, $titleField);
|
|
}
|
|
|
|
/**
|
|
* Create a DataObject from the given SQL row
|
|
*
|
|
* @param array $row
|
|
* @return DataObject
|
|
*/
|
|
protected function createDataObject($row) {
|
|
$defaultClass = $this->dataClass;
|
|
|
|
// Failover from RecordClassName to ClassName
|
|
if(empty($row['RecordClassName'])) {
|
|
$row['RecordClassName'] = $row['ClassName'];
|
|
}
|
|
|
|
// Instantiate the class mentioned in RecordClassName only if it exists, otherwise default to $this->dataClass
|
|
if(class_exists($row['RecordClassName'])) {
|
|
$item = Injector::inst()->create($row['RecordClassName'], $row, false, $this->model);
|
|
} else {
|
|
$item = Injector::inst()->create($defaultClass, $row, false, $this->model);
|
|
}
|
|
|
|
//set query params on the DataObject to tell the lazy loading mechanism the context the object creation context
|
|
$item->setSourceQueryParams($this->dataQuery()->getQueryParams());
|
|
|
|
return $item;
|
|
}
|
|
|
|
/**
|
|
* Returns an Iterator for this DataList.
|
|
* This function allows you to use DataLists in foreach loops
|
|
*
|
|
* @return ArrayIterator
|
|
*/
|
|
public function getIterator() {
|
|
return new ArrayIterator($this->toArray());
|
|
}
|
|
|
|
/**
|
|
* Return the number of items in this DataList
|
|
*
|
|
* @return int
|
|
*/
|
|
public function count() {
|
|
return $this->dataQuery->count();
|
|
}
|
|
|
|
/**
|
|
* Return the maximum value of the given field in this DataList
|
|
*
|
|
* @param string $fieldName
|
|
* @return mixed
|
|
*/
|
|
public function max($fieldName) {
|
|
return $this->dataQuery->max($fieldName);
|
|
}
|
|
|
|
/**
|
|
* Return the minimum value of the given field in this DataList
|
|
*
|
|
* @param string $fieldName
|
|
* @return mixed
|
|
*/
|
|
public function min($fieldName) {
|
|
return $this->dataQuery->min($fieldName);
|
|
}
|
|
|
|
/**
|
|
* Return the average value of the given field in this DataList
|
|
*
|
|
* @param string $fieldName
|
|
* @return mixed
|
|
*/
|
|
public function avg($fieldName) {
|
|
return $this->dataQuery->avg($fieldName);
|
|
}
|
|
|
|
/**
|
|
* Return the sum of the values of the given field in this DataList
|
|
*
|
|
* @param string $fieldName
|
|
* @return mixed
|
|
*/
|
|
public function sum($fieldName) {
|
|
return $this->dataQuery->sum($fieldName);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns the first item in this DataList
|
|
*
|
|
* @return DataObject
|
|
*/
|
|
public function first() {
|
|
foreach($this->dataQuery->firstRow()->execute() as $row) {
|
|
return $this->createDataObject($row);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the last item in this DataList
|
|
*
|
|
* @return DataObject
|
|
*/
|
|
public function last() {
|
|
foreach($this->dataQuery->lastRow()->execute() as $row) {
|
|
return $this->createDataObject($row);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns true if this DataList has items
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function exists() {
|
|
return $this->count() > 0;
|
|
}
|
|
|
|
/**
|
|
* Find the first DataObject of this DataList where the given key = value
|
|
*
|
|
* @param string $key
|
|
* @param string $value
|
|
* @return DataObject|null
|
|
*/
|
|
public function find($key, $value) {
|
|
return $this->filter($key, $value)->first();
|
|
}
|
|
|
|
/**
|
|
* Restrict the columns to fetch into this DataList
|
|
*
|
|
* @param array $queriedColumns
|
|
* @return DataList
|
|
*/
|
|
public function setQueriedColumns($queriedColumns) {
|
|
return $this->alterDataQuery(function($query) use ($queriedColumns){
|
|
$query->setQueriedColumns($queriedColumns);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Filter this list to only contain the given Primary IDs
|
|
*
|
|
* @param array $ids Array of integers
|
|
* @return DataList
|
|
*/
|
|
public function byIDs(array $ids) {
|
|
return $this->filter('ID', $ids);
|
|
}
|
|
|
|
/**
|
|
* Return the first DataObject with the given ID
|
|
*
|
|
* @param int $id
|
|
* @return DataObject
|
|
*/
|
|
public function byID($id) {
|
|
return $this->filter('ID', $id)->first();
|
|
}
|
|
|
|
/**
|
|
* Returns an array of a single field value for all items in the list.
|
|
*
|
|
* @param string $colName
|
|
* @return array
|
|
*/
|
|
public function column($colName = "ID") {
|
|
return $this->dataQuery->column($colName);
|
|
}
|
|
|
|
// Member altering methods
|
|
|
|
/**
|
|
* Sets the ComponentSet to be the given ID list.
|
|
* Records will be added and deleted as appropriate.
|
|
*
|
|
* @param array $idList List of IDs.
|
|
*/
|
|
public function setByIDList($idList) {
|
|
$has = array();
|
|
|
|
// Index current data
|
|
foreach($this->column() as $id) {
|
|
$has[$id] = true;
|
|
}
|
|
|
|
// Keep track of items to delete
|
|
$itemsToDelete = $has;
|
|
|
|
// add items in the list
|
|
// $id is the database ID of the record
|
|
if($idList) foreach($idList as $id) {
|
|
unset($itemsToDelete[$id]);
|
|
if($id && !isset($has[$id])) {
|
|
$this->add($id);
|
|
}
|
|
}
|
|
|
|
// Remove any items that haven't been mentioned
|
|
$this->removeMany(array_keys($itemsToDelete));
|
|
}
|
|
|
|
/**
|
|
* Returns an array with both the keys and values set to the IDs of the records in this list.
|
|
*
|
|
*/
|
|
public function getIDList() {
|
|
$ids = $this->column("ID");
|
|
return $ids ? array_combine($ids, $ids) : array();
|
|
}
|
|
|
|
/**
|
|
* Returns a HasManyList or ManyMany list representing the querying of a relation across all
|
|
* objects in this data list. For it to work, the relation must be defined on the data class
|
|
* that you used to create this DataList.
|
|
*
|
|
* Example: Get members from all Groups:
|
|
*
|
|
* DataList::Create("Group")->relation("Members")
|
|
*
|
|
* @param string $relationName
|
|
* @return HasManyList|ManyManyList
|
|
*/
|
|
public function relation($relationName) {
|
|
$ids = $this->column('ID');
|
|
return singleton($this->dataClass)->$relationName()->forForeignID($ids);
|
|
}
|
|
|
|
public function dbObject($fieldName) {
|
|
return singleton($this->dataClass)->dbObject($fieldName);
|
|
}
|
|
|
|
/**
|
|
* Add a number of items to the component set.
|
|
*
|
|
* @param array $items Items to add, as either DataObjects or IDs.
|
|
* @return DataList
|
|
*/
|
|
public function addMany($items) {
|
|
foreach($items as $item) {
|
|
$this->add($item);
|
|
}
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Remove the items from this list with the given IDs
|
|
*
|
|
* @param array $idList
|
|
* @return DataList
|
|
*/
|
|
public function removeMany($idList) {
|
|
foreach($idList as $id) {
|
|
$this->removeByID($id);
|
|
}
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Remove every element in this DataList matching the given $filter.
|
|
*
|
|
* @param string $filter - a sql type where filter
|
|
* @return DataList
|
|
*/
|
|
public function removeByFilter($filter) {
|
|
foreach($this->where($filter) as $item) {
|
|
$this->remove($item);
|
|
}
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Remove every element in this DataList.
|
|
*
|
|
* @return DataList
|
|
*/
|
|
public function removeAll() {
|
|
foreach($this as $item) {
|
|
$this->remove($item);
|
|
}
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* This method are overloaded by HasManyList and ManyMany list to perform more sophisticated
|
|
* list manipulation
|
|
*
|
|
* @param mixed $item
|
|
*/
|
|
public function add($item) {
|
|
// Nothing needs to happen by default
|
|
// TO DO: If a filter is given to this data list then
|
|
}
|
|
|
|
/**
|
|
* Return a new item to add to this DataList.
|
|
*
|
|
* @todo This doesn't factor in filters.
|
|
*/
|
|
public function newObject($initialFields = null) {
|
|
$class = $this->dataClass;
|
|
return Injector::inst()->create($class, $initialFields, false, $this->model);
|
|
}
|
|
|
|
/**
|
|
* Remove this item by deleting it
|
|
*
|
|
* @param DataClass $item
|
|
* @todo Allow for amendment of this behaviour - for example, we can remove an item from
|
|
* an "ActiveItems" DataList by chaning the status to inactive.
|
|
*/
|
|
public function remove($item) {
|
|
// By default, we remove an item from a DataList by deleting it.
|
|
$this->removeByID($item->ID);
|
|
}
|
|
|
|
/**
|
|
* Remove an item from this DataList by ID
|
|
*
|
|
* @param int $itemID - The primary ID
|
|
*/
|
|
public function removeByID($itemID) {
|
|
$item = $this->byID($itemID);
|
|
|
|
if($item) {
|
|
return $item->delete();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reverses a list of items.
|
|
*
|
|
* @return DataList
|
|
*/
|
|
public function reverse() {
|
|
return $this->alterDataQuery(function($query){
|
|
$query->reverseSort();
|
|
});
|
|
}
|
|
|
|
/**
|
|
* This method won't function on DataLists due to the specific query that it represent
|
|
*
|
|
* @param mixed $item
|
|
*/
|
|
public function push($item) {
|
|
user_error("Can't call DataList::push() because its data comes from a specific query.", E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* This method won't function on DataLists due to the specific query that it represent
|
|
*
|
|
* @param mixed $item
|
|
*/
|
|
public function insertFirst($item) {
|
|
user_error("Can't call DataList::insertFirst() because its data comes from a specific query.", E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* This method won't function on DataLists due to the specific query that it represent
|
|
*
|
|
*/
|
|
public function shift() {
|
|
user_error("Can't call DataList::shift() because its data comes from a specific query.", E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* This method won't function on DataLists due to the specific query that it represent
|
|
*
|
|
*/
|
|
public function replace() {
|
|
user_error("Can't call DataList::replace() because its data comes from a specific query.", E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* This method won't function on DataLists due to the specific query that it represent
|
|
*
|
|
*/
|
|
public function merge() {
|
|
user_error("Can't call DataList::merge() because its data comes from a specific query.", E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* This method won't function on DataLists due to the specific query that it represent
|
|
*
|
|
*/
|
|
public function removeDuplicates() {
|
|
user_error("Can't call DataList::removeDuplicates() because its data comes from a specific query.",
|
|
E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* Returns whether an item with $key exists
|
|
*
|
|
* @param mixed $key
|
|
* @return bool
|
|
*/
|
|
public function offsetExists($key) {
|
|
return ($this->limit(1,$key)->First() != null);
|
|
}
|
|
|
|
/**
|
|
* Returns item stored in list with index $key
|
|
*
|
|
* @param mixed $key
|
|
* @return DataObject
|
|
*/
|
|
public function offsetGet($key) {
|
|
return $this->limit(1, $key)->First();
|
|
}
|
|
|
|
/**
|
|
* Set an item with the key in $key
|
|
*
|
|
* @param mixed $key
|
|
* @param mixed $value
|
|
*/
|
|
public function offsetSet($key, $value) {
|
|
user_error("Can't alter items in a DataList using array-access", E_USER_ERROR);
|
|
}
|
|
|
|
/**
|
|
* Unset an item with the key in $key
|
|
*
|
|
* @param mixed $key
|
|
*/
|
|
public function offsetUnset($key) {
|
|
user_error("Can't alter items in a DataList using array-access", E_USER_ERROR);
|
|
}
|
|
|
|
}
|