Properties with @Groups annotations included in output when no SerializationContext given.

[pdugas]

Q	A
Bug report?	Yes
Feature request?	No
BC Break report?	No
RFC?	No

Steps required to reproduce the problem

1. Define a class with one or more properties with no annotations and one or more with @Groups.

use JMS\Serializer\Annotation\Groups;

class Eg
{   
    private $id = 1;

    /** @Groups({"WithFoo"}) */
    private $foo = 'foo';
}

2. Serialize an instance of the class without specifying a SerializationContext.

$this->assertSame(['id'=>1], json_decode($serializer->serialize(new Eg(), 'json')));

3. Check the output.

Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
 Array &0 (
     'id' => 1
+    'foo' => 'foo'
 )

Expected Result

• The foo property should not have been included in the result.

Actual Result

• See above. foo property is incorrectly included.
• I can make the test pass by explicitly adding the Default group.

$this->assertSame(
    ['id'=>1], 
    json_decode($serializer->serialize(
        new Eg(), 'json',
        SerializationContext::create()->setGroups(['Default'])
    ))
);

The way I read the documentation, only the Default group should be serialized by default. Am I wrong?

[goetas]

If you don't pass to the context some groups, the serialization groups exclusion strategy is not used at all, thus all props are serialized

[pdugas]

Got it @goetas. I've adjusted my usage so I always specify the Default group when serializing the returned data from my API and optionally add groups like "withfoo" and "withbar" based on a query parameter from the client. Works great. Thanks.