howto handle edit forms with FileType inputs in sy

in a symfony2 application a entity Message has a one-to-many relation to documents. Documents represents user uploads. i created a form. I realized two Forms: MessageForm and DocumentForm. DocumentForm lives inside a collection FormField in MessageForm. Uploading and processing files does work.

But if i want to edit the entity Message the Form contains as many empty FileInputs as there are Documents existing. desired behaviour would be:

FileInputs to upload new files
Filename (link) to existing files
Possibility to delete existing files

This should be handled inside the form. Changes should be done when the form is submitted.

How can this be realized?

回答1:

Solution is to write a custom form type extension. as described on http://symfony.com/doc/2.1/cookbook/form/create_form_type_extension.html.

filetype extension

    <?php

    use Symfony\Component\Form\AbstractTypeExtension;
    use Symfony\Component\Form\FormView;
    use Symfony\Component\Form\FormInterface;
    use Symfony\Component\Form\Util\PropertyPath;
    use Symfony\Component\OptionsResolver\OptionsResolverInterface;

    /**
     * Class FileTypeExtension
     *
     * @see http://symfony.com/doc/2.1/cookbook/form/create_form_type_extension.html
     */
    class FileTypeExtension extends AbstractTypeExtension
    {
        /**
        * Returns the name of the type being extended.
        *
        * @return string The name of the type being extended
        */
        public function getExtendedType()
        {
            return 'file';
        }

        /**
         * Add the image_path option
         *
         * @param OptionsResolverInterface $resolver
         */
        public function setDefaultOptions(OptionsResolverInterface $resolver)
        {
            $resolver->setOptional(array('file_path', 'file_name'));
        }

        /**
         * Pass the image url to the view
         *
         * @param FormView $view
         * @param FormInterface $form
         * @param array $options
         */
        public function buildView(FormView $view, FormInterface $form, array $options)
        {
            if (array_key_exists('file_path', $options)) {
                $parentData = $form->getParent()->getData();

                if (null !== $parentData) {
                    $propertyPath = new PropertyPath($options['file_path']);
                    $fileUrl = $propertyPath->getValue($parentData);
                } else {
                    $fileUrl = null;
                }

                $view->set('file_url', $fileUrl);
            }

            if (array_key_exists('file_name', $options)) {
                $parentData = $form->getParent()->getData();

                if (null !== $parentData) {
                    $propertyPath = new PropertyPath($options['file_name']);
                    $fileName = $propertyPath->getValue($parentData);
                } else {
                    $fileName = null;
                }

                $view->set('file_name', $fileName);
            }
        }
    }

customized file_widget

    {% block file_widget %}
        {% spaceless %}

            {% if file_url is not null %}
                <div><a href="{{ file_url }}">{{ file_name }}</a></div>
                <div style="display:none">{{ block('form_widget') }}</div>
            {% else %}
                {{ block('form_widget') }}
            {% endif %}

        {% endspaceless %}
    {% endblock %}

services.yml

    parameters:
        foobar.file_type_extension.class: Foobar\Form\Extension\FileTypeExtension

    services:
        foobar.file_type_extension:
            class: %replacethis.file_type_extension.class%
            tags:
              - { name: form.type_extension, alias: file }

inside a formtype

    $builder->add('file','file', array(
                "label" => "Datei",
                "required" => true,
                "attr" => array(),
                "file_path" => "webPath",
                "file_name" => "name"
            ));

that's it ;)

回答2:

In addition to the above answere - wich will let you build a file input wich can be rendered as a link (if it has an url) or a field (if it doesn't) - you might take a look at

http://symfony.com/doc/2.0/cookbook/form/form_collections.html

Wich in conjunction with some jQuery will let you add fields in UI.