This commit moves support for the :include serialization option for
serializing associated objects out of ActiveRecord in into ActiveModel.
The following methods support the :include option:
* serializable_hash
* to_json
* to_xml
Instances must respond to methods named by the values of the :includes
array (or keys of the :includes hash). If an association method returns
an object that is_a?(Enumerable) (which AR has_many associations do), it
is assumed to be a collection association, and its elements must respond
to :serializable_hash. Otherwise it must respond to :serializable_hash
itself.
While here, fix#858, XmlSerializer should not singularize already
singular association names.
- as_json in ActiveModel should return a hash
and handle :only/:except/:methods options
- Array and Hash should call as_json on their elements
- json methods should not modify options argument
[#5374 state:committed]
Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>
