Attribute check for belongs_to resolution

[marktran]

class Resource < Daylight::API
  belongs_to :owner
end

ActiveResource supports (rails/activeresource#50) resolving a belongs_to association via a foreign key:

r = Resource.first 
=> {
  ...
  "owner_id": 42
}

or through the attribute name:

r = Resource.first 
=> {
  ...
  "owner": {
    ...
  }
}

It looks like Daylight is failing on the latter since it expects the foreign key to be present.

Relevant line:

daylight/lib/daylight/associations.rb

Line 101 in cfd2135

reflection.klass.find(send(reflection.foreign_key))