entity Field Type¶

A special choice field that’s designed to load options from a Doctrine entity. For example, if you have a Category entity, you could use this field to display a select field of all, or some, of the Category objects from the database.

Rendered as	can be various tags (see Select Tag, Checkboxes or Radio Buttons)
Options	class data_class em group_by property query_builder
Overridden Options	choices choice_list
Inherited options	from the choice type: empty_value expanded multiple preferred_choices from the form type: data disabled empty_data error_bubbling error_mapping label label_attr mapped read_only required
Parent type	choice
Class	`EntityType`

Basic Usage¶

The entity type has just one required option: the entity which should be listed inside the choice field:

$builder->add('users', 'entity', array(
    'class' => 'AcmeHelloBundle:User',
    'property' => 'username',
));

In this case, all User objects will be loaded from the database and rendered as either a select tag, a set or radio buttons or a series of checkboxes (this depends on the multiple and expanded values). If the entity object does not have a __toString() method the property option is needed.

Using a Custom Query for the Entities¶

If you need to specify a custom query to use when fetching the entities (e.g. you only want to return some entities, or need to order them), use the query_builder option. The easiest way to use the option is as follows:

use Doctrine\ORM\EntityRepository;
// ...

$builder->add('users', 'entity', array(
    'class' => 'AcmeHelloBundle:User',
    'query_builder' => function(EntityRepository $er) {
        return $er->createQueryBuilder('u')
            ->orderBy('u.username', 'ASC');
    },
));

Using Choices¶

If you already have the exact collection of entities that you want included in the choice element, you can simply pass them via the choices key. For example, if you have a $group variable (passed into your form perhaps as a form option) and getUsers returns a collection of User entities, then you can supply the choices option directly:

$builder->add('users', 'entity', array(
    'class' => 'AcmeHelloBundle:User',
    'choices' => $group->getUsers(),
));

Select Tag, Checkboxes or Radio Buttons¶

This field may be rendered as one of several different HTML fields, depending on the expanded and multiple options:

Element Type	Expanded	Multiple
select tag	`false`	`false`
select tag (with `multiple` attribute)	`false`	`true`
radio buttons	`true`	`false`
checkboxes	`true`	`true`

Field Options¶

class¶

type: string required

The class of your entity (e.g. AcmeStoreBundle:Category). This can be a fully-qualified class name (e.g. Acme\StoreBundle\Entity\Category) or the short alias name (as shown prior).

data_class¶

type: string

This option is used to set the appropriate data mapper to be used by the form, so you can use it for any form field type which requires an object.

$builder->add('media', 'sonata_media_type', array(
    'data_class' => 'Acme\DemoBundle\Entity\Media',
));

em¶

type: string default: the default entity manager

If specified, the specified entity manager will be used to load the choices instead of the default entity manager.

group_by¶

type: string

This is a property path (e.g. author.name) used to organize the available choices in groups. It only works when rendered as a select tag and does so by adding optgroup elements around options. Choices that do not return a value for this property path are rendered directly under the select tag, without a surrounding optgroup.

property¶

type: string

This is the property that should be used for displaying the entities as text in the HTML element. If left blank, the entity object will be cast into a string and so must have a __toString() method.

注解

The property option is the property path used to display the option. So you can use anything supported by the PropertyAccessor component

For example, if the translations property is actually an associative array of objects, each with a name property, then you could do this:

$builder->add('gender', 'entity', array(
   'class' => 'MyBundle:Gender',
   'property' => 'translations[en].name',
));

query_builder¶

type: Doctrine\ORM\QueryBuilder or a Closure

If specified, this is used to query the subset of options (and their order) that should be used for the field. The value of this option can either be a QueryBuilder object or a Closure. If using a Closure, it should take a single argument, which is the EntityRepository of the entity.

Overridden Options¶

choice_list¶

default: EntityChoiceList

The purpose of the entity type is to create and configure this EntityChoiceList for you, by using all of the above options. If you need to override this option, you may just consider using the choice Field Type directly.

choices¶

type: array | \Traversable default: null

Instead of allowing the class and query_builder options to fetch the entities to include for you, you can pass the choices option directly. See Using Choices.

Inherited Options¶

These options inherit from the choice type:

empty_value¶

2.3 新版功能: Since Symfony 2.3, empty values are also supported if the expanded option is set to true.

type: string or Boolean

This option determines whether or not a special “empty” option (e.g. “Choose an option”) will appear at the top of a select widget. This option only applies if the multiple option is set to false.

Add an empty value with “Choose an option” as the text:

$builder->add('states', 'choice', array(
    'empty_value' => 'Choose an option',
));

Guarantee that no “empty” value option is displayed:

$builder->add('states', 'choice', array(
    'empty_value' => false,
));

If you leave the empty_value option unset, then a blank (with no text) option will automatically be added if and only if the required option is false:

// a blank (with no text) option will be added
$builder->add('states', 'choice', array(
    'required' => false,
));

expanded¶

type: Boolean default: false

If set to true, radio buttons or checkboxes will be rendered (depending on the multiple value). If false, a select element will be rendered.

multiple¶

type: Boolean default: false

If true, the user will be able to select multiple options (as opposed to choosing just one option). Depending on the value of the expanded option, this will render either a select tag or checkboxes if true and a select tag or radio buttons if false. The returned value will be an array.

注解

If you are working with a collection of Doctrine entities, it will be helpful to read the documentation for the collection Field Type as well. In addition, there is a complete example in the cookbook article How to Embed a Collection of Forms.

preferred_choices¶

type: array default: array()

If this option is specified, then a sub-set of all of the options will be moved to the top of the select menu. The following would move the “Baz” option to the top, with a visual separator between it and the rest of the options:

$builder->add('foo_choices', 'choice', array(
    'choices' => array('foo' => 'Foo', 'bar' => 'Bar', 'baz' => 'Baz'),
    'preferred_choices' => array('baz'),
));

Note that preferred choices are only meaningful when rendering as a select element (i.e. expanded is false). The preferred choices and normal choices are separated visually by a set of dotted lines (i.e. -------------------). This can be customized when rendering the field:

Twig

{{ form_widget(form.foo_choices, { 'separator': '=====' }) }}

PHP

<?php echo $view['form']->widget($form['foo_choices'], array('separator' => '=====')) ?>

注解

This option expects an array of entity objects, unlike the choice field that requires an array of keys.

These options inherit from the form type:

data¶

type: mixed default: Defaults to field of the underlying object (if there is one)

When you create a form, each field initially displays the value of the corresponding property of the form’s domain object (if an object is bound to the form). If you want to override the initial value for the form or just an individual field, you can set it in the data option:

$builder->add('token', 'hidden', array(
    'data' => 'abcdef',
));

注解

The default values for form fields are taken directly from the underlying data structure (e.g. an entity or an array). The data option overrides this default value.

disabled¶

2.1 新版功能: The disabled option was introduced in Symfony 2.1.

type: boolean default: false

If you don’t want a user to modify the value of a field, you can set the disabled option to true. Any submitted value will be ignored.

empty_data¶

type: mixed

The actual default value of this option depends on other field options:

If multiple is false and expanded is false, then '' (empty string);
Otherwise array() (empty array).

This option determines what value the field will return when the submitted value is empty.

But you can customize this to your needs. For example, if you want the gender choice field to be explicitly set to null when no value is selected, you can do it like this:

$builder->add('gender', 'choice', array(
    'choices' => array(
        'm' => 'Male',
        'f' => 'Female'
    ),
    'required'    => false,
    'empty_value' => 'Choose your gender',
    'empty_data'  => null
));

注解

If you want to set the empty_data option for your entire form class, see the cookbook article How to Configure empty Data for a Form Class.

error_bubbling¶

type: Boolean default: false unless the form is compound

If true, any errors for this field will be passed to the parent field or form. For example, if set to true on a normal field, any errors for that field will be attached to the main form, not to the specific field.

error_mapping¶

2.1 新版功能: The error_mapping option was introduced in Symfony 2.1.

type: array default: empty

This option allows you to modify the target of a validation error.

Imagine you have a custom method named matchingCityAndZipCode that validates whether the city and zip code match. Unfortunately, there is no “matchingCityAndZipCode” field in your form, so all that Symfony can do is display the error on top of the form.

With customized error mapping, you can do better: map the error to the city field so that it displays above it:

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'error_mapping' => array(
            'matchingCityAndZipCode' => 'city',
        ),
    ));
}

Here are the rules for the left and the right side of the mapping:

The left side contains property paths;
If the violation is generated on a property or method of a class, its path is simply propertyName;
If the violation is generated on an entry of an array or ArrayAccess object, the property path is [indexName];
You can construct nested property paths by concatenating them, separating properties by dots. For example: addresses[work].matchingCityAndZipCode;
The left side of the error mapping also accepts a dot ., which refers to the field itself. That means that any error added to the field is added to the given nested field instead;
The right side contains simply the names of fields in the form.

label¶

type: string default: The label is “guessed” from the field name

Sets the label that will be used when rendering the field. Setting to false will suppress the label. The label can also be directly set inside the template:

Twig

{{ form_label(form.name, 'Your name') }}

PHP

echo $view['form']->label(
    $form['name'],
    'Your name'
);

label_attr¶

type: array default: array()

Sets the HTML attributes for the <label> element, which will be used when rendering the label for the field. It’s an associative array with HTML attribute as a key. This attributes can also be directly set inside the template:

Twig

{{ form_label(form.name, 'Your name', {'label_attr': {'class': 'CUSTOM_LABEL_CLASS'}}) }}

PHP

echo $view['form']->label(
    $form['name'],
    'Your name',
    array('label_attr' => array('class' => 'CUSTOM_LABEL_CLASS'))
);

mapped¶

type: boolean default: true

If you wish the field to be ignored when reading or writing to the object, you can set the mapped option to false.

read_only¶

type: Boolean default: false

If this option is true, the field will be rendered with the readonly attribute so that the field is not editable.

required¶

type: Boolean default: true

If true, an HTML5 required attribute will be rendered. The corresponding label will also render with a required class.

This is superficial and independent from validation. At best, if you let Symfony guess your field type, then the value of this option will be guessed from your validation information.

注解

The required option also affects how empty data for each field is handled. For more details, see the empty_data option.