symfony2 get all validation constraints on an entity (yml, xml, annotations)

问题

Im trying to get all validation constraints on an entity and translate theses constraints to Jquery validation rules, right now im able to get annotation defined constraints (thanks to : Symfony2 get validation constraints on an entity), but im having some trouble getting xml and yml ones.

$xml_file_loader = new XmlFileLoader("path_to_my_project/vendor/friendsofsymfony/user-bundle\FOS\UserBundle\Resources\config\validation.xml");

Using a similar code means that i need to know beforehand where the xml/yml file is located, i m trying to write somehow a generic code that can do this automatically.

Isn't there a way to get all constraints at once? if not how can i know the location of xml/yml files, and also in cases of inheritance i need to check for parent constraints... Is this doable?

回答1:

private function getValidations()
    {
        $validations=[];
        $validator=$this->get("validator");
        $metadata=$validator->getMetadataFor(new your_entity());
        $constrainedProperties=$metadata->getConstrainedProperties();
        foreach($constrainedProperties as $constrainedProperty)
        {
            $propertyMetadata=$metadata->getPropertyMetadata($constrainedProperty);
            $constraints=$propertyMetadata[0]->constraints;
            $outputConstraintsCollection=[];
            foreach($constraints as $constraint)
            {
                $class = new \ReflectionObject($constraint);
                $constraintName=$class->getShortName();
                $constraintParameter=null;
                switch ($constraintName) 
                {
                    case "NotBlank":
                        $param="notBlank";
                        break;
                    case "Type":
                        $param=$constraint->type;
                        break;
                    case "Length":
                        $param=$constraint->max;
                        break;
                }
                $outputConstraintsCollection[$constraintName]=$param;
            }
            $validations[$constrainedProperty]=$outputConstraintsCollection;
        }
        return $validations;
    }

Returns:

array(13) (
      [property1] => array(4) (
        [NotBlank] => (string) notBlank
        [NotNull] => (string) notBlank
        [Type] => (string) string
        [Length] => (int) 11
      )
      [property2] => array(4) (
        [NotBlank] => (string) notBlank
        [NotNull] => (string) notBlank
        [Type] => (string) string
        [Length] => (int) 40
      )
      ..........
)

The returned array can be configured or used to define client side validation rules depending on the client-side validation library/code that you are using

$validator=$this->get("validator");
$metadata=$validator->getMetadataFor(new yourentity());

The object $metadata now contains all the metadata about validations that concerns your specific entity.

来源：https://stackoverflow.com/questions/15573935/symfony2-get-all-validation-constraints-on-an-entity-yml-xml-annotations

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