feature symfony#15279 Added {{ value }} message placeholder to UniqueEntityValidator (jperovic)

This PR was submitted for the 2.8 branch but it was merged into the 3.1-dev branch instead (closes symfony#15279).

Discussion
----------

Added {{ value }} message placeholder to UniqueEntityValidator

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#15268
| License       | MIT
| Doc PR        | -

Apologize if I missed something. This is my first contribution to a large scale project.

Commits
-------

9cf1ce9 Added {{ value }} message placeholder to UniqueEntityValidator

Author: fabpot

src/Symfony/Bridge/Doctrine/CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+3.1.0
+-----
+
+ * added "{{ value }}" message placeholder to UniqueEntityValidator 
+
 3.0.0
 -----
 

src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php

@@ -161,6 +161,7 @@ public function testValidateUniqueness()
 
         $this->buildViolation('myMessage')
             ->atPath('property.path.name')
+            ->setParameter('{{ value }}', 'Foo')
             ->setInvalidValue('Foo')
             ->assertRaised();
     }
@@ -184,6 +185,7 @@ public function testValidateCustomErrorPath()
 
         $this->buildViolation('myMessage')
             ->atPath('property.path.bar')
+            ->setParameter('{{ value }}', 'Foo')
             ->setInvalidValue('Foo')
             ->assertRaised();
     }
@@ -235,6 +237,7 @@ public function testValidateUniquenessWithIgnoreNull()
 
         $this->buildViolation('myMessage')
             ->atPath('property.path.name')
+            ->setParameter('{{ value }}', 'Foo')
             ->setInvalidValue('Foo')
             ->assertRaised();
     }
@@ -266,6 +269,7 @@ public function testValidateUniquenessWithValidCustomErrorPath()
 
         $this->buildViolation('myMessage')
             ->atPath('property.path.name2')
+            ->setParameter('{{ value }}', 'Bar')
             ->setInvalidValue('Bar')
             ->assertRaised();
     }
@@ -398,6 +402,7 @@ public function testAssociatedEntity()
 
         $this->buildViolation('myMessage')
             ->atPath('property.path.single')
+            ->setParameter('{{ value }}', 1)
             ->setInvalidValue(1)
             ->assertRaised();
     }

src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php

@@ -140,6 +140,7 @@ public function validate($entity, Constraint $constraint)
 
         $this->context->buildViolation($constraint->message)
             ->atPath($errorPath)
+            ->setParameter('{{ value }}', $invalidValue)
             ->setInvalidValue($invalidValue)
             ->addViolation();
     }