问题
I am trying to build a form in ZF2. The problem comes when I want to populate the options array of a Select input element from a database table. A response to this question Zend FrameWork 2 Get ServiceLocator In Form and populate a drop down list by @timdev pointed me to the ZF2 docs where the 'correct' method is described. I followed this carefully but I suspect that they must have left obvious code out assuming I could fill in the gaps as I cannot get it to work. Can anyone see what I am doing wrong?
I start with a form to which I add a fieldset:
namespace Ctmm\Form;
use Zend\Form\Form;
class AddPropertyForm extends Form {
public function __construct() {
parent::__construct('AddProperty');
$this->setName('addProperty');
$this->setAttribute('method', 'post');
$this->add(array(
'name' => 'property',
'type' => 'PropertyFieldset'
));
} }
I then create the fieldset:
namespace Ctmm\Form;
use Ctmm\Model;
use Zend\Form\Fieldset;
class PropertyFieldset extends Fieldset {
public function __construct(PropertyType $property_type) {
$this->add(array(
'name' => 'property_type',
'type' => 'Zend\Form\Element\Select',
'attributes' => array(
'required' => true,
),
'options' => array(
'label' => 'Property Type',
'value_options' => array(
0 => 'Detached house',
1 => 'Semi-detached house',
2 => 'Terraced house',
3 => 'Bungalow',
4 => 'Maisonette',
5 => 'Flat',
6 => 'Land',
7 => 'Development Opportunity',
),
),
));
}
}
As you can see I inject PropertyType dependency into the fieldset. At this stage, I have not even used this to generate the options array. I have hard coded the array values to avoid adding another source of possible errors. Once I get the form to render I will then try to pull the array data from the PropertyType table.
Now I set up the form element manager in my Module.php:
namespace Ctmm;
use Ctmm\Form\PropertyFieldset;
use Zend\ModuleManager\Feature\FormElementProviderInterface;
class Module implements FormElementProviderInterface {
public function getFormElementConfig() {
return array(
'factories' => array(
'PropertyFieldset' => function($sm) {
$serviceLocator = $sm->getServiceLocator();
$property_type = $serviceLocator->get('Ctmm\Model\PropertyType');
$fieldset = new PropertyFieldset($property_type);
}
)
);
}
}
This code is straight from the docs. I have tried adding
return $fieldset;
to the PropertyFieldset factory, and I have even tried adding
'invokables' => array(
'PropertyFieldset' => 'Ctmm\Form\PropertyFieldset'
)
to the getFormElementConfig array, as well as replacing the factory with the invokable.
The last step is to create the form in my controller action using the form element manager:
public function addAction() {
$formManager = $this->serviceLocator->get('FormElementManager');
$form = $formManager->get('Ctmm\Form\AddPropertyForm');
}
Whatever I do, I get an error saying the Servicemanager cannot create the PropertyFieldset:
Zend\ServiceManager\Exception\ServiceNotFoundException
File:
/home/mike/public_html/ctmm/vendor/zendframework/zendframework/library/Zend/ServiceManager/ServiceManager.php:456
Message:
Zend\ServiceManager\ServiceManager::get was unable to fetch or create an instance for PropertyFieldset
Stack trace:
#0 /home/mike/public_html/ctmm/vendor/zendframework/zendframework/library/Zend/ServiceManager/AbstractPluginManager.php(103): Zend\ServiceManager\ServiceManager->get('PropertyFieldse...', true)
#1 /home/mike/public_html/ctmm/vendor/zendframework/zendframework/library/Zend/Form/Factory.php(110): Zend\ServiceManager\AbstractPluginManager->get('PropertyFieldse...')
#2 /home/mike/public_html/ctmm/vendor/zendframework/zendframework/library/Zend/Form/Form.php(145): Zend\Form\Factory->create(Array)
#3 /home/mike/public_html/ctmm/module/Ctmm/src/Ctmm/Form/AddPropertyForm.php(33): Zend\Form\Form->add(Array)
Line 33 in AddPropertyForm.php is where I try to add my custom PropertyFieldset. Clearly I have an error in the fieldset itself or in the way I am declaring it. I have tried without injecting the PropertyType dependency, but that makes no difference. For completeness, the code for my PropertyType model is:
namespace Ctmm\Model;
class PropertyType {
public $id;
public $property_type;
protected $adapter;
public function __construct($adapter) {
$this->adapter = $adapter;
}
public function exchangeArray($data) {
$this->id = (isset($data['id'])) ? $data['id'] : null;
$this->property_type = (isset($data['property_type'])) ? $data['property_type'] : null;
}
public function getPropertyType() {
return $this->property_type;
}
public function fetchAll() {
$sql_query = "SELECT id, property_type from property_type";
$statement = $this->adapter->createStatement($sql_query);
$results = $statement->execute();
return $results;
}
}
Edit:
I don't have an answer but I have done some more investigation. I created a fieldset directly in the controller to test my PropertyFieldset class and it's dependent model.
$property_type = $this->getServiceLocator()->get('Ctmm\Model\PropertyType');
$fieldset = new PropertyFieldset($property_type);
This did not work immediately. First, I had to take the hinting out of the Fieldset contructor
public function __construct(PropertyFieldset $property_type) {
became
public function __construct($property_type) {
I then had to add
parent::__construct('propertyfieldset');
before it would allow me to add an element.
Once I had added these changes I was able to create a PropertyFieldset object in the controller. I could test this by var_dump()ing it.
Unfortunately, these changes to the PropertyFieldset class did not fix the basic problem, so that when I try to create the form in the controller, it generates the same error as before. I have, at least exonerated the PropertyFieldset class and it's dependent model, which says to me that I have something wrong in the getFormElementConfig() in my Module.php class
回答1:
So I got this to work with a few minor changes:
As you noted the PropertyFieldSet should call the parents construct like so:
parent::__construct('propertyfieldset');
ElementConfig should be like so:
public function getFormElementConfig() {
return array(
'factories' => array(
'PropertyFieldset' => function($sm) {
$serviceLocator = $sm->getServiceLocator();
$property_type = $serviceLocator->get('Ctmm\Model\PropertyType');
$fieldset = new PropertyFieldset($property_type);
return $fieldset;
},
)
);
}
And the AddPropertyForm should be like so:
namespace Ctmm\Form;
use Zend\Form\Form;
class AddPropertyForm extends Form {
public function init() {
parent::__construct('AddProperty');
$this->setName('addProperty');
$this->setAttribute('method', 'post');
$this->add(array(
'name' => 'addproperty',
'type' => 'PropertyFieldset',
));
}
}
Instead of using __construct we use init(). This function is apparently called when instantiated by factory: http://framework.zend.com/apidoc/2.1/classes/Zend.Form.Form.html#init
Regarding building the select, I would pass a TableGateway object to the fieldSet instead of a model. Then using a fetchAll function we could do the following in the form:
class PropertyFieldset extends Fieldset {
public function __construct(PropertyTypeTable $propertyTypeTable) {
parent::__construct('propertyfieldset');
$propertyValOpts = array();
foreach($propertyTypeTable->fetchAll() as $propertyRow) {
array_push($propertyValOpts,$propertyRow->property_type);
}
$this->add(array(
'name' => 'property_type',
'type' => 'Zend\Form\Element\Select',
'attributes' => array(
'required' => true,
),
'options' => array(
'label' => 'Property Type',
'value_options' => $propertyValOpts
),
));
}
}
Hope this helps :)
来源：https://stackoverflow.com/questions/15448919/handling-dependencies-in-zend-framework-2-forms