发布于 2015-08-27 16:35:40 | 169 次阅读 | 评论: 0 | 来源: 网络整理
The Image constraint works exactly like the File constraint, except that its mimeTypes and mimeTypesMessage options are automatically setup to work for image files specifically.
Additionally it has options so you can validate against the width and height of the image.
See the File constraint for the bulk of the documentation on this constraint.
| Applies to | property or method |
| Options |
|
| Class | Image |
| Validator | ImageValidator |
This constraint is most commonly used on a property that will be rendered
in a form as a file form type. For example,
suppose you’re creating an author form where you can upload a “headshot”
image for the author. In your form, the headshot property would be a
file type. The Author class might look as follows:
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentHttpFoundationFileFile;
class Author
{
protected $headshot;
public function setHeadshot(File $file = null)
{
$this->headshot = $file;
}
public function getHeadshot()
{
return $this->headshot;
}
}
To guarantee that the headshot File object is a valid image and that
it is between a certain size, add the following:
# src/Acme/BlogBundle/Resources/config/validation.yml
AcmeBlogBundleEntityAuthor
properties:
headshot:
- Image:
minWidth: 200
maxWidth: 400
minHeight: 200
maxHeight: 400
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentValidatorConstraints as Assert;
class Author
{
/**
* @AssertImage(
* minWidth = 200,
* maxWidth = 400,
* minHeight = 200,
* maxHeight = 400
* )
*/
protected $headshot;
}
<!-- src/Acme/BlogBundle/Resources/config/validation.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
<class name="AcmeBlogBundleEntityAuthor">
<property name="headshot">
<constraint name="Image">
<option name="minWidth">200</option>
<option name="maxWidth">400</option>
<option name="minHeight">200</option>
<option name="maxHeight">400</option>
</constraint>
</property>
</class>
</constraint-mapping>
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentValidatorMappingClassMetadata;
use SymfonyComponentValidatorConstraints as Assert;
class Author
{
public static function loadValidatorMetadata(ClassMetadata $metadata)
{
$metadata->addPropertyConstraint('headshot', new AssertImage(array(
'minWidth' => 200,
'maxWidth' => 400,
'minHeight' => 200,
'maxHeight' => 400,
)));
}
}
The headshot property is validated to guarantee that it is a real image
and that it is between a certain width and height.
You may also want to guarantee the headshot image to be square. In this
case you can disable portrait and landscape orientations as shown in the
following code:
# src/Acme/BlogBundle/Resources/config/validation.yml
AcmeBlogBundleEntityAuthor
properties:
headshot:
- Image:
allowLandscape: false
allowPortrait: false
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentValidatorConstraints as Assert;
class Author
{
/**
* @AssertImage(
* allowLandscape = false
* allowPortrait = false
* )
*/
protected $headshot;
}
<!-- src/Acme/BlogBundle/Resources/config/validation.xml -->
<class name="AcmeBlogBundleEntityAuthor">
<property name="headshot">
<constraint name="Image">
<option name="allowLandscape">false</option>
<option name="allowPortrait">false</option>
</constraint>
</property>
</class>
// src/Acme/BlogBundle/Entity/Author.php
namespace AcmeBlogBundleEntity;
use SymfonyComponentValidatorMappingClassMetadata;
use SymfonyComponentValidatorConstraints as Assert;
class Author
{
// ...
public static function loadValidatorMetadata(ClassMetadata $metadata)
{
$metadata->addPropertyConstraint('headshot', new AssertImage(array(
'allowLandscape' => false,
'allowPortrait' => false,
)));
}
}
You can mix all the constraint options to create powerful validation rules.
This constraint shares all of its options with the File constraint. It does, however, modify two of the default option values and add several other options.
type: array or string default: image/*
You can find a list of existing image mime types on the IANA website.
type: string default: This file is not a valid image.
type: integer
If set, the width of the image file must be greater than or equal to this value in pixels.
type: integer
If set, the width of the image file must be less than or equal to this value in pixels.
type: integer
If set, the height of the image file must be greater than or equal to this value in pixels.
type: integer
If set, the height of the image file must be less than or equal to this value in pixels.
type: float
If set, the aspect ratio (width / height) of the image file must be less
than or equal to this value.
type: float
If set, the aspect ratio (width / height) of the image file must be greater
than or equal to this value.
type: Boolean default: true
If this option is false, the image cannot be a square. If you want to force
a square image, then set leave this option as its default true value
and set allowLandscape and allowPortrait both to false.
type: Boolean default: true
If this option is false, the image cannot be landscape oriented.
type: Boolean default: true
If this option is false, the image cannot be portrait oriented.
type: string default: The size of the image could not be detected.
If the system is unable to determine the size of the image, this error will be displayed. This will only occur when at least one of the size constraint options has been set.
type: string default: The image width is too big ({{ width }}px).
Allowed maximum width is {{ max_width }}px.
The error message if the width of the image exceeds maxWidth.
type: string default: The image width is too small ({{ width }}px).
Minimum width expected is {{ min_width }}px.
The error message if the width of the image is less than minWidth.
type: string default: The image height is too big ({{ height }}px).
Allowed maximum height is {{ max_height }}px.
The error message if the height of the image exceeds maxHeight.
type: string default: The image height is too small ({{ height }}px).
Minimum height expected is {{ min_height }}px.
The error message if the height of the image is less than minHeight.
type: string default: The image ratio is too big ({{ ratio }}).
Allowed maximum ratio is {{ max_ratio }}
The error message if the aspect ratio of the image exceeds maxRatio.
type: string default: The image ratio is too small ({{ ratio }}).
Minimum ratio expected is {{ min_ratio }}
The error message if the aspect ratio of the image is less than minRatio.
type: string default: The image is square ({{ width }}x{{ height }}px).
Square images are not allowed
The error message if the image is square and you set allowSquare to false.
type: string default: The image is landscape oriented ({{ width }}x{{ height }}px).
Landscape oriented images are not allowed
The error message if the image is landscape oriented and you set allowLandscape to false.
type: string default: The image is portrait oriented ({{ width }}x{{ height }}px).
Portrait oriented images are not allowed
The error message if the image is portrait oriented and you set allowPortrait to false.