Merge pull request #2522 from tractorcow/pulls/3.2-gridstate-api-fix

API GridState_Data values can have default values specified during retrieval.

docs/en/reference/grid-field.md

@@ -345,6 +345,23 @@ transfered between page requests by being inserted as a hidden field in the form
 
 A GridFieldComponent sets and gets data from the GridState.
 
+Data within this object can be nested, allowing for organisation of information in a logical fashion. Additionally,
+default values can be specified for any data field by invoking that field as a method, passing the default value
+as the first parameter. If no default is specified then a nested `GridState_Data` is returned, which may be chained
+to subsequently nest data values.
+
+Example:
+
+	:::php
+	
+	public function getManipulatedData(GridField $gridField, SS_List $dataList) {
+		// Accesses the GridState, returns a nested GridState_Data, and retrieve a single field with a default of null
+		$objectID = $gridField->State->MyComponent->RecordID(null);
+		if($objectID) $dataList = $dataList->filter('ParentID', $objectID);
+		return $dataList;
+	}
+
+
 ## Permissions
 
 Since GridField is mostly used in the CMS, the controller managing a GridField instance

forms/gridfield/GridField.php

@@ -17,6 +17,7 @@
  * 
  * @package framework
  * @subpackage fields-gridfield
+ * @property GridState_Data $State The gridstate of this object
  */
 class GridField extends FormField {
 	

forms/gridfield/GridFieldAddExistingAutocompleter.php

@@ -93,20 +93,13 @@ class GridFieldAddExistingAutocompleter
 	 * @return string - HTML
 	 */
 	public function getHTMLFragments($gridField) {
-		$searchState = $gridField->State->GridFieldSearchRelation;
 		$dataClass = $gridField->getList()->dataClass();
 		
 		$forTemplate = new ArrayData(array());
 		$forTemplate->Fields = new ArrayList();
 
-		$searchFields = ($this->getSearchFields())
+		$searchField = new TextField('gridfield_relationsearch', _t('GridField.RelationSearch', "Relation search"));
-			? $this->getSearchFields()
-			: $this->scaffoldSearchFields($dataClass);
 		
-		$value = $this->findSingleEntry($gridField, $searchFields, $searchState, $dataClass);
-
-		$searchField = new TextField('gridfield_relationsearch',
-			_t('GridField.RelationSearch', "Relation search"), $value);
 		$searchField->setAttribute('data-search-url', Controller::join_links($gridField->Link('search')));
 		$searchField->setAttribute('placeholder', $this->getPlaceholderText($dataClass));
 		$searchField->addExtraClass('relation-search no-change-track');
@@ -120,7 +113,7 @@ class GridFieldAddExistingAutocompleter
 		$addAction->setAttribute('data-icon', 'chain--plus');
 
 		// If an object is not found, disable the action
-		if(!is_int($gridField->State->GridFieldAddRelation)) {
+		if(!is_int($gridField->State->GridFieldAddRelation(null))) {
 			$addAction->setReadonly(true);
 		}
 		
@@ -139,17 +132,16 @@ class GridFieldAddExistingAutocompleter
 	 * @return array
 	 */
 	public function getActions($gridField) {
-		return array('addto', 'find');
+		return array('addto');
 	}
 
 	/**
-	 * Manipulate the state to either add a new relation, or doing a small search
+	 * Manipulate the state to add a new relation
 	 * 
 	 * @param GridField $gridField
-	 * @param string $actionName
+	 * @param string $actionName Action identifier, see {@link getActions()}.
-	 * @param string $arguments
+	 * @param array $arguments Arguments relevant for this 
-	 * @param string $data
+	 * @param array $data All form data
-	 * @return string
 	 */
 	public function handleAction(GridField $gridField, $actionName, $arguments, $data) {
 		switch($actionName) {
@@ -157,10 +149,6 @@ class GridFieldAddExistingAutocompleter
 				if(isset($data['relationID']) && $data['relationID']){
 					$gridField->State->GridFieldAddRelation = $data['relationID'];
 				}
-				$gridField->State->GridFieldSearchRelation = '';
-				break;
-			case 'find' && isset($data['autosuggest_search']):
-				$gridField->State->GridFieldSearchRelation = $data['autosuggest_search'];
 				break;
 		}
 	}
@@ -173,16 +161,14 @@ class GridFieldAddExistingAutocompleter
 	 * @return SS_List 
 	 */
 	public function getManipulatedData(GridField $gridField, SS_List $dataList) {
-		if(!$gridField->State->GridFieldAddRelation) {
+		$objectID = $gridField->State->GridFieldAddRelation(null);
+		if(empty($objectID)) {
 			return $dataList;
 		}
-		$objectID = Convert::raw2sql($gridField->State->GridFieldAddRelation);
-		if($objectID) {
 		$object = DataObject::get_by_id($dataList->dataclass(), $objectID);
 		if($object) {
 			$dataList->add($object);
 		}
-		}
 		$gridField->State->GridFieldAddRelation = null;
 		return $dataList;
 	}
@@ -375,33 +361,4 @@ class GridFieldAddExistingAutocompleter
 	public function setResultsLimit($limit) {
 		$this->resultsLimit = $limit;
 	}
-
-	/**
-	 * This will provide a StartsWith search that only returns a value if we are
-	 * matching ONE object only. We wouldn't want to attach used any object to
-	 * the list.
-	 * 
-	 * @param GridField $gridField
-	 * @param string $field
-	 * @param string $searchTerm
-	 * @param string $dataclass
-	 * @return string 
-	 */
-	protected function findSingleEntry($gridField, $field, $searchTerm, $dataclass) {
-		$fullList = DataList::create($dataclass);
-		$searchTerm = Convert::raw2sql($searchTerm);
-		if(!$searchTerm) {
-			return;
-		}
-		$existingList = clone $gridField->getList();
-		$searchResults = $fullList->subtract($existingList->limit(0))->filter($field.':StartsWith', $searchTerm);
-		
-		// If more than one, skip
-		if($searchResults->count() != 1) {
-			return '';
-		}
-		
-		$gridField->State->GridFieldAddRelation = $searchResults->first()->ID;
-		return $searchResults->first()->$field;
-	}
 }

forms/gridfield/GridFieldFilterHeader.php

@@ -87,12 +87,12 @@ class GridFieldFilterHeader implements GridField_HTMLProvider, GridField_DataMan
 	public function getManipulatedData(GridField $gridField, SS_List $dataList) {
 		if(!$this->checkDataType($dataList)) return $dataList;
 		
-		$state = $gridField->State->GridFieldFilterHeader;
+		$columns = $gridField->State->GridFieldFilterHeader->Columns(null);
-		if(!isset($state->Columns)) {
+		if(empty($columns)) {
 			return $dataList;
 		}
 		
-		$filterArguments = $state->Columns->toArray();
+		$filterArguments = $columns->toArray();
 		$dataListClone = clone($dataList);
 		foreach($filterArguments as $columnName => $value ) {
 			if($dataList->canFilterBy($columnName) && $value) {

forms/gridfield/GridFieldPaginator.php

@@ -110,7 +110,7 @@ class GridFieldPaginator implements GridField_HTMLProvider, GridField_DataManipu
 		$state = $gridField->State->GridFieldPaginator;
 		
 		// Force the state to the initial page if none is set
-		if(empty($state->currentPage)) $state->currentPage = 1;
+		$state->currentPage(1);
 		
 		return $state;
 	}

forms/gridfield/GridFieldSortableHeader.php

@@ -98,7 +98,7 @@ class GridFieldSortableHeader implements GridField_HTMLProvider, GridField_DataM
 			}
 			if($title && $gridField->getList()->canSortBy($columnField)) {
 				$dir = 'asc';
-				if($state->SortColumn == $columnField && $state->SortDirection == 'asc') {
+				if($state->SortColumn(null) == $columnField && $state->SortDirection('asc') == 'asc') {
 					$dir = 'desc';
 				}
 				
@@ -107,10 +107,10 @@ class GridFieldSortableHeader implements GridField_HTMLProvider, GridField_DataM
 					"sort$dir", array('SortColumn' => $columnField)
 				)->addExtraClass('ss-gridfield-sort');
 
-				if($state->SortColumn == $columnField){
+				if($state->SortColumn(null) == $columnField){
 					$field->addExtraClass('ss-gridfield-sorted');
 
-					if($state->SortDirection == 'asc')
+					if($state->SortDirection('asc') == 'asc')
 						$field->addExtraClass('ss-gridfield-sorted-asc');
 					else
 						$field->addExtraClass('ss-gridfield-sorted-desc');
@@ -165,9 +165,10 @@ class GridFieldSortableHeader implements GridField_HTMLProvider, GridField_DataM
 		if(!$this->checkDataType($dataList)) return $dataList;
 
 		$state = $gridField->State->GridFieldSortableHeader;
-		if ($state->SortColumn == "") {
+		$sortColumn = $state->SortColumn();
+		if (empty($sortcolumn)) {
 			return $dataList;
 		}
-		return $dataList->sort($state->SortColumn, $state->SortDirection);
+		return $dataList->sort($sortColumn, $state->SortDirection('asc'));
 	}
 }

forms/gridfield/GridState.php

@@ -59,7 +59,7 @@ class GridState extends HiddenField {
 	}
 	
 	/**
-	 * @var GridState_Data
+	 * @return GridState_Data
 	 */
 	public function getData() {
 		if(!$this->data) {
@@ -136,8 +136,25 @@ class GridState_Data {
 	}
 	
 	public function __get($name) {
-		if(!isset($this->data[$name])) {
+		return $this->getData($name, new GridState_Data());
-			$this->data[$name] = new GridState_Data();
+	}
+	
+	public function __call($name, $arguments) {
+		// Assume first parameter is default value
+		$default = empty($arguments) ? new GridState_Data() : $arguments[0];
+		return $this->getData($name, $default);
+	}
+	
+	/**
+	 * Retrieve the value for the given key
+	 * 
+	 * @param string $name The name of the value to retrieve
+	 * @param mixed $default Default value to assign if not set
+	 * @return mixed The value associated with this key, or the value specified by $default if not set
+	 */
+	public function getData($name, $default = null) {
+		if(empty($this->data[$name])) {
+			$this->data[$name] = $default;
 		} else if(is_array($this->data[$name])) {
 			$this->data[$name] = new GridState_Data($this->data[$name]);
 		}

tests/forms/GridFieldTest.php

@@ -107,6 +107,30 @@ class GridFieldTest extends SapphireTest {
 		$this->assertTrue($obj->getState(false) instanceof GridState);
 	}
 	
+	/**
+	 * Tests usage of nested GridState values
+	 * 
+	 * @covers GridState_Data::__get
+	 * @covers GridState_Data::__call
+	 * @covers GridState_Data::getData
+	 */
+	public function testGetStateData() {
+		$obj = new GridField('testfield', 'testfield');
+		
+		// Check value persistance
+		$this->assertEquals(15, $obj->State->NoValue(15));
+		$this->assertEquals(15, $obj->State->NoValue(-1));
+		$obj->State->NoValue = 10;
+		$this->assertEquals(10, $obj->State->NoValue);
+		$this->assertEquals(10, $obj->State->NoValue(20));
+		
+		// Check nested values
+		$this->assertInstanceOf('GridState_Data', $obj->State->Nested);
+		$this->assertInstanceOf('GridState_Data', $obj->State->Nested->DeeperNested());
+		$this->assertEquals(3, $obj->State->Nested->DataValue(3));
+		$this->assertEquals(10, $obj->State->Nested->DeeperNested->DataValue(10));
+	}
+
 	/**
 	 * @covers GridField::getColumns
 	 */