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<?php |
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class PointsOfInterestLayerExtension extends DataExtension |
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{ |
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public static $many_many = array( |
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'PointsOfInterestLayers' => 'PointsOfInterestLayer', |
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); |
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public static $belongs_many_many_extraFields = array( |
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'PointsOfInterestLayers' => array( |
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'SortOrder' => 'Int', |
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), |
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); |
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/** |
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* Update cms fields - add list of POIs. |
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* |
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* @param FieldList $fields list of existing fields on the object |
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*/ |
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2 |
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public function updateCMSFields(FieldList $fields) |
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{ |
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$gridConfig2 = GridFieldConfig_RelationEditor::create(); |
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$gridConfig2->getComponentByType( |
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'GridFieldAddExistingAutocompleter')-> |
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setSearchFields(array('Name') |
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); |
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$gridConfig2->getComponentByType('GridFieldPaginator')->setItemsPerPage(100); |
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$gridField2 = new GridField('POI Layers', 'POI Layers:', |
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$this->owner->PointsOfInterestLayers(), |
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$gridConfig2 |
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); |
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$fields->addFieldToTab('Root.MapLayers', $gridField2); |
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} |
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/** |
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* Use extension point to add the markers |
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* @param MapAPI &$map reference to object representing the map |
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* @param $autozoom will be altered to true for autozoom, false not to |
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*/ |
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public function updateBasicMap(&$map, &$autozoom) |
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{ |
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foreach($this->owner->PointsOfInterestLayers() as $layer) { |
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$layericon = $layer->DefaultIcon(); |
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if ($layericon->ID === 0) { |
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$layericon = null; |
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} |
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foreach ($layer->PointsOfInterest() as $poi) { |
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if ($poi->MapPinEdited) { |
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if ($poi->MapPinIconID == 0 && $layericon) { |
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$poi->CachedMapPinURL = $layericon->getAbsoluteURL(); |
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} |
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$map->addMarkerAsObject($poi); |
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// we have a point of interest, so turn on auto zoom |
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$autozoom = true; |
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} |
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} |
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} |
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$map->setClusterer(true); |
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} |
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/** |
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* Only set has geo to true if layers exist |
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* @param boolean &$hasGeo will be set to true if any layers |
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*/ |
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public function updateHasGeo(&$hasGeo) |
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{ |
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if ($this->owner->PointsOfInterestLayers()->count() > 0) { |
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$hasGeo = true; |
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} |
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} |
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} |
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Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: