silverstripe-framework/forms/MultiSelectField.php

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<?php
use SilverStripe\Model\Relation;
/**
* Represents a SelectField that may potentially have multiple selections, and may have
* a {@link ManyManyList} as a data source.
*/
abstract class MultiSelectField extends SelectField {
/**
* List of items to mark as checked, and may not be unchecked
*
* @var array
*/
protected $defaultItems = array();
/**
* Extracts the value of this field, normalised as an array.
* Scalar values will return a single length array, even if empty
*
* @return array List of values as an array
*/
public function getValueArray() {
return $this->getListValues($this->Value());
}
/**
* Default selections, regardless of the {@link setValue()} settings.
* Note: Items marked as disabled through {@link setDisabledItems()} can still be
* selected by default through this method.
*
* @param array $items Collection of array keys, as defined in the $source array
* @return $this Self reference
*/
public function setDefaultItems($items) {
$this->defaultItems = $this->getListValues($items);
return $this;
}
/**
* Default selections, regardless of the {@link setValue()} settings.
*
* @return array
*/
public function getDefaultItems() {
return $this->defaultItems;
}
/**
* Load a value into this MultiSelectField
*/
public function setValue($val, $obj = null) {
// If we're not passed a value directly,
// we can look for it in a relation method on the object passed as a second arg
if($obj instanceof DataObject) {
$this->loadFrom($obj);
} else {
return parent::setValue($val);
}
return $this;
}
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/**
* Load the value from the dataobject into this field
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*
* @param DataObjectInterface $record
*/
public function loadFrom(DataObjectInterface $record) {
$fieldName = $this->getName();
if(empty($fieldName) || empty($record)) {
return;
}
$relation = $record->hasMethod($fieldName)
? $record->$fieldName()
: null;
// Detect DB relation or field
if($relation instanceof Relation) {
// Load ids from relation
$value = array_values($relation->getIDList());
parent::setValue($value);
} elseif($record->hasField($fieldName)) {
$value = $this->stringDecode($record->$fieldName);
parent::setValue($value);
}
}
/**
* Save the current value of this MultiSelectField into a DataObject.
* If the field it is saving to is a has_many or many_many relationship,
* it is saved by setByIDList(), otherwise it creates a comma separated
* list for a standard DB text/varchar field.
*
* @param DataObject $record The record to save into
*/
public function saveInto(DataObjectInterface $record) {
$fieldName = $this->getName();
if(empty($fieldName) || empty($record)) {
return;
}
$relation = $record->hasMethod($fieldName)
? $record->$fieldName()
: null;
// Detect DB relation or field
$items = $this->getValueArray();
if($relation instanceof Relation) {
// Save ids into relation
$relation->setByIDList($items);
} elseif($record->hasField($fieldName)) {
// Save dataValue into field
$record->$fieldName = $this->stringEncode($items);
}
}
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/**
* Encode a list of values into a string, or null if empty (to simplify empty checks)
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*
* @param array $value
* @return string|null
*/
public function stringEncode($value) {
return $value
? json_encode(array_values($value))
: null;
}
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/**
* Extract a string value into an array of values
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*
* @param string $value
* @return array
*/
protected function stringDecode($value) {
// Handle empty case
if(empty($value)) {
return array();
}
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// If json deserialisation fails, then fallover to legacy format
$result = json_decode($value, true);
if($result !== false) {
return $result;
}
throw new \InvalidArgumentException("Invalid string encoded value for multi select field");
}
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/**
* Validate this field
*
* @param Validator $validator
* @return bool
*/
public function validate($validator) {
$values = $this->getValueArray();
$validValues = $this->getValidValues();
// Filter out selected values not in the data source
$self = $this;
$invalidValues = array_filter(
$values,
function($userValue) use ($self, $validValues) {
foreach($validValues as $formValue) {
if($self->isSelectedValue($formValue, $userValue)) {
return false;
}
}
return true;
}
);
if(empty($invalidValues)) {
return true;
}
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// List invalid items
$validator->validationError(
$this->getName(),
_t(
'MultiSelectField.SOURCE_VALIDATION',
"Please select values within the list provided. Invalid option(s) {value} given",
array('value' => implode(',', $invalidValues))
),
"validation"
);
return false;
}
/**
* Transforms the source data for this CheckboxSetField
* into a comma separated list of values.
*
* @return ReadonlyField
*/
public function performReadonlyTransformation() {
$source = $this->getSource();
// Map selected values to titles
$data = array();
foreach($this->getValueArray() as $value) {
if(array_key_exists($value, $source)) {
$data[] = $source[$value];
} else {
$data[] = $value;
}
}
$values = implode(', ', $data);
$field = $this->castedCopy('ReadonlyField');
$field->setValue($values);
return $field;
}
}