bug #19924 [DoctrineBridge][PropertyInfo] Treat Doctrine decimal type as string (teohhanhui)

This PR was merged into the 2.8 branch.

Discussion
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[DoctrineBridge][PropertyInfo] Treat Doctrine decimal type as string

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A

Using `float` for decimal type defeats the purpose of avoiding rounding errors / loss of precision.

See http://docs.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/types.html#decimal

Commits
-------

62d28f9 [DoctrineBridge][PropertyInfo] Treat Doctrine decimal type as string

src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php

@@ -178,12 +178,12 @@ class DoctrineExtractor implements PropertyListExtractorInterface, PropertyTypeE
                 return Type::BUILTIN_TYPE_INT;
 
             case DBALType::FLOAT:
-            case DBALType::DECIMAL:
                 return Type::BUILTIN_TYPE_FLOAT;
 
             case DBALType::STRING:
             case DBALType::TEXT:
             case DBALType::GUID:
+            case DBALType::DECIMAL:
                 return Type::BUILTIN_TYPE_STRING;
 
             case DBALType::BOOLEAN:

src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php

@@ -49,6 +49,8 @@ class DoctrineExtractorTest extends \PHPUnit_Framework_TestCase
                 'time',
                 'json',
                 'simpleArray',
+                'float',
+                'decimal',
                 'bool',
                 'binary',
                 'customFoo',
@@ -73,6 +75,8 @@ class DoctrineExtractorTest extends \PHPUnit_Framework_TestCase
         return array(
             array('id', array(new Type(Type::BUILTIN_TYPE_INT))),
             array('guid', array(new Type(Type::BUILTIN_TYPE_STRING))),
+            array('float', array(new Type(Type::BUILTIN_TYPE_FLOAT))),
+            array('decimal', array(new Type(Type::BUILTIN_TYPE_STRING))),
             array('bool', array(new Type(Type::BUILTIN_TYPE_BOOL))),
             array('binary', array(new Type(Type::BUILTIN_TYPE_RESOURCE))),
             array('json', array(new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true))),

src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php

@@ -65,6 +65,16 @@ class DoctrineDummy
      */
     private $simpleArray;
 
+    /**
+     * @Column(type="float")
+     */
+    private $float;
+
+    /**
+     * @Column(type="decimal", precision=10, scale=2)
+     */
+    private $decimal;
+
     /**
      * @Column(type="boolean")
      */