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I'm using Symfony 2.1 forms with PropelBundle and I'm trying to refactor a form that had a drop-down list of objects (to select from) to instead use a jquery autocomplete field (working with AJAX). For the dropdown list I was using the following code (which worked perfectly for the drop-down) in my form type:

$builder->add('books', 'collection', array(
    'type'          => 'model',
    'options'       => array(
        'class'     => 'MyVendor\MyBundle\Model\Book',
        'property'  => 'title',
    ),
    'allow_add'     => true,
    'allow_delete'  => true,
    'by_reference'  => false,
    'required'      => false,
));

For the sake of giving a little context, let's say we are creating a new "Reader" object and that we would like to select the Reader's favorite books from a list of available "Book" objects. A collection type is used so that many "favorite books" can be selected in the new "Reader" form. Now, I would like to change the above to use autocomplete. For doing so, I tried to implement a Data Transformer to be able to get a Book object from a simple text field that could be used for the Autocomplete function to pass the Book ID as indicated in the answer to this Question. However, I was not able to figure out how to make the Data Transformer work with a collection type and Propel classes. I created a BookToIdTransformer class as indicated in the Symfony Cookbook and tried the following in the "ReaderType" file:

$transformer = new BookToIdTransformer();
$builder->add(
        $builder->create('books', 'collection', array(
            'type'          => 'text',
            'allow_add'     => true,
            'allow_delete'  => true,
            'by_reference'  => false,
            'required'      => false,
        ))->addModelTransformer($transformer)
);

With the above, I get a "Call to undefined method: getId" exception (apparently the Transformer expects a PropelCollection of Books, not a single Book object..). Does anyone know how to go about it? or let me know if there are other ways to implement the autocomplete in Symfony using Propel and allowing for selecting multiple objects (e.g. a collection of books)?

4

1 に答える 1

14

私が最終的に求めた解決策は、以前の回答とは少し異なります。複数のオブジェクト（「お気に入りの本」など）を選択して関連付けることができるLoopj Tokeninput jQueryプラグインを使用することになったため、「ReaderType」フォームの「collection」フィールドタイプではなく「text」フィールドタイプを使用することになりました。フォーム内のメインオブジェクト（「Reader」オブジェクトなど）に。それを考慮して、（テキストフィールドのコンマ区切りリストで）渡されたオブジェクトのIDをPropelオブジェクトコレクションに変換するための「データトランスフォーマー」を作成しました。コードは、サンプルのajaxオブジェクトコントローラーを含め、次のように共有されます。

「ReaderType」フォームの重要な部分は次のようになります。

$transformer = new BooksToIdsTransformer();
$builder->add(
    $builder->create('books', 'text', array(
        'required' => false,
    ))->addModelTransformer($transformer)
);

「DataTransformer」ファイルは次のようになります。

// src/MyVendor/MyBundle/Form/DataTransformer/BooksToIdsTransformer.php
namespace MyVendor\MyBundle\Form\DataTransformer;

use \PropelObjectCollection;
use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
use MyVendor\MyBundle\Model\BookQuery;

class BooksToIdsTransformer implements DataTransformerInterface
{
    public function transform($books)
    {
        if (null === $books) {
            return "";
        }

        if (!$books instanceof PropelObjectCollection) {
            throw new UnexpectedTypeException($books, '\PropelObjectCollection');
        }
        $idsArray = array();
        foreach ($books as $book) {
            $idsArray[] = $book->getId();
        }
        $ids = implode(",", $idsArray);
        return $ids;
    }

    public function reverseTransform($ids)
    {
        $books = new PropelObjectCollection();

        if ('' === $ids || null === $ids) {
            return $books;
        }

        if (!is_string($ids)) {
            throw new UnexpectedTypeException($ids, 'string');
        }
        $idsArray = explode(",", $ids);
        $idsArray = array_filter ($idsArray, 'is_numeric');
        foreach ($idsArray as $id) {
            $books->append(BookQuery::create()->findOneById($id));
        }
        return $books;
    }
}

「本」のjsonコレクションをTokeninputオートコンプリート関数に返すajaxコントローラーは次のとおりです。

namespace MyVendor\MyBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use MyVendor\MyBundle\Model\BookQuery;


class ClassAjaxController extends Controller
{
    public function bookAction(Request $request)
    {
        $value = $request->get('q');

        $books = BookQuery::create()->findByName('%'.$value.'%');

        $json = array();
        foreach ($books as $book) {
            $json[] = array(
                'id' => $book->getId(),
                'name' => $book->getName()
            );
        }

        $response = new Response();
        $response->setContent(json_encode($json));

        return $response;
    }
}

そして最後に、「routing.yml」ファイルのルーター：

ajax_book:
    pattern:  /ajax_book
    defaults: { _controller: MySiteBundle:ClassAjax:book }
于 2012-08-20T14:46:41.040 に答える