Symfony2中表单中实体字段类型的其他属性 [英] Additional properties to entity Field Type in a form in Symfony2

问题描述

在Symfony2中，是否有一种方法可以将实体中的更多字段映射到从基于实体的表单生成的选择下拉列表的选项标签中？

In Symfony2, is there a way to map more fields from an entity to the option tag of a select dropdown generated from a form which is based on an entity?

我目前有类似的东西：

    $builder->add('creditcard', 'entity',
        array( 'label' => 'Credit Card',
            'required' => true,
            'expanded' => false,
            'class' => 'Acme\Bundle\Entity\CreditCard',
            'property' => 'display_text',
            'multiple' => false,
            'query_builder' => function(\Acme\Bundle\Repository\CreditCardRepository $er)  {
                return $er->createQueryBuilder('b');
            },
            'mapped' => false,
        ));

这很好，但我想生成类似的东西：

This works just fine, but I would like to generate something like:

<option value="id" string_mapped_from_field1="value_of_field1">display_text</option>

谢谢！

推荐答案

好，如果有人带着相同的问题来到这里，这就是我最后要做的事情：

Ok, in case somebody gets here with the same question, this is what I've done in the end:

我创建了一个自定义字段类型（请参见 http://symfony.com/doc/current/cookbook/form/create_custom_field_type.html ）

I've created a custom field type (see http://symfony.com/doc/current/cookbook/form/create_custom_field_type.html)

由于我们最终将成为实体字段，因此您想添加：

Since we is going to be an entity field in the end, you want to add:

    public function getParent() {
        return 'entity';
    }

在表单上使用时：

    $builder->add('creditcard', new CreditCardFieldType(),
        array( 'label' => 'Credit Card',
            'required' => true,
            'expanded' => false,
            'class' => 'Acme\Bundle\Entity\CreditCardCharge',
            'property' => 'object',
            'multiple' => false,
            'query_builder' => function(\Acme\Bundle\Repository\CreditCardChargeRepository $er)  {
                return $er->createQueryBuilder('b');
            },
            'mapped' => false,
        ));

对象是添加到包含整个对象的实体的新属性，因此我添加到了实体：

object is a new property added to the entity that contains the whole object, so I added to the entity:

public function getObject()
{
    return $this;
}

这样，我们可以从模板访问对象，我们只需要为我们自己的自定义字段类型创建一个新模板：

This way we can access to the object from the template, we just need to create a new template for our own custom field type:

{% block creditcard_widget %}
    {% spaceless %}
        {% if required and empty_value is none and not empty_value_in_choices %}
            {% set required = false %}
        {% endif %}
        <select {{ block('widget_attributes') }}{% if multiple %} multiple="multiple"{% endif %}>
            {% if empty_value is not none %}
                <option value=""{% if required and value is empty %} selected="selected"{% endif %}>{{ empty_value|trans({}, translation_domain) }}</option>
            {% endif %}
            {% if preferred_choices|length > 0 %}
                {% set options = preferred_choices %}
                {{ block('choice_creditcard_widget_options') }}
                {% if choices|length > 0 and separator is not none %}
                    <option disabled="disabled">{{ separator }}</option>
                {% endif %}
            {% endif %}
            {% set options = choices %}
            {{ block('choice_creditcard_widget_options') }}
        </select>
    {% endspaceless %}
{% endblock creditcard_widget %}

{% block choice_creditcard_widget_options %}
    {% spaceless %}
        {% for group_label, choice in options %}
            {% if choice is iterable %}
                <optgroup label="{{ group_label|trans({}, translation_domain) }}">
                    {% set options = choice %}
                    {{ block('choice_creditcard_widget_options') }}
                </optgroup>
            {% else %}
                <option value="{{ choice.data.creditcard }}" charge="{{  choice.data.charge }}" {% if choice is selectedchoice(data.creditcard_charges_id) %} selected="selected"{% endif %}>{{ choice.data.text|trans({}, translation_domain) }}</option>
            {% endif %}
        {% endfor %}
    {% endspaceless %}
{% endblock choice_creditcard_widget_options %}

并在您的config.yml中将其注册为小树枝：

And register it for twig in your config.yml:

twig:
    form:
        resources:
            - 'AcmeBundle:Form:creditcardfield.html.twig'

不确定这是最好的解决方案，但是可以解决问题。希望对您有所帮助。

Not sure it is the best solution but it does the trick. Hope it helps.

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