we know that for Yii 2.0 restful API resources has fields, which can be represented by anonymous functions.
For example: ‘name’ in the following official example.
// explicitly list every field, best used when you want to make sure the changes
// in your DB table or model attributes do not cause your field changes (to keep API backward compatibility).
public function fields()
{
return [
// field name is the same as the attribute name
'id',
// field name is "email", the corresponding attribute name is "email_address"
'email' => 'email_address',
// field name is "name", its value is defined by a PHP callback
'name' => function ($model) { <=================== here, the parameter $model for fields 'name'
return $model->first_name . ' ' . $model->last_name;
},
];
}
my question is when using this field, how to pass function parameters (i.e. $model) into the function?
A late update, to answer it for other people who might also wondering
the anonymous function has pre-defined signature
mixed function (ActiveRecord $model, String $field) {
}
$model is an instance of ActiveRecord associated with ActiveController, as specified by $modelClass
$field is the name of this special field, in this case it is ‘name’
class UserController extends \yii\rest\ActiveController
{
public $modelClass = 'app\models\Users'; <============= here is class definition
}
the call stack is as follows:
app\models\{closure}(): /yii2-basic/models/Users.php at line 57 <====== break point at the anonymous function in question
toArray(): /yii2-basic/vendor/yiisoft/yii2/base/ArrayableTrait.php at line 120 <====== shown below
serializeModels(): /yii2-basic/vendor/yiisoft/yii2/rest/Serializer.php at line 278
serializeDataProvider(): /yii2-basic/vendor/yiisoft/yii2/rest/Serializer.php at line 174
serialize(): /yii2-basic/vendor/yiisoft/yii2/rest/Serializer.php at line 143
serializeData(): /yii2-basic/vendor/yiisoft/yii2/rest/Controller.php at line 97
afterAction(): /yii2-basic/vendor/yiisoft/yii2/rest/Controller.php at line 75
runAction(): /yii2-basic/vendor/yiisoft/yii2/base/Controller.php at line 153
runAction(): /yii2-basic/vendor/yiisoft/yii2/base/Module.php at line 455
handleRequest(): /yii2-basic/vendor/yiisoft/yii2/web/Application.php at line 84
run(): /yii2-basic/vendor/yiisoft/yii2/base/Application.php at line 375
/yii2-basic/web/index.php at line 12
here is the signature found in Yii’s source code:
public function toArray(array $fields = [], array $expand = [], $recursive = true)
{
$data = [];
foreach ($this->resolveFields($fields, $expand) as $field => $definition) {
$data[$field] = is_string($definition) ? $this->$definition : call_user_func($definition, $this, $field); <==== ArrayableTrait.php at line 120
}
if ($this instanceof Linkable) {
$data['_links'] = Link::serialize($this->getLinks());
}
return $recursive ? ArrayHelper::toArray($data) : $data;
}
