Fix serializable resource extensions.

Author: beauby

lib/jsonapi/rails/deserializable/resource_extensions.rb

@@ -6,13 +6,13 @@ module Deserializable
       module ResourceExtensions
         def deserialize_has_one_rel!(rel, &block)
           id = rel['data'] && rel['data']['id']
-          type = rel['data'] && rel['data']['type'].singularize.constantize
+          type = rel['data'] && rel['data']['type'].singularize.camelize
           instance_exec(rel, id, type, &block)
         end
 
         def deserialize_has_many_rel!(rel, &block)
           ids = rel['data'].map { |ri| ri['id'] }
-          types = rel['data'].map { |ri| ri['type'].singularize.constantize }
+          types = rel['data'].map { |ri| ri['type'].singularize.camelize }
           instance_exec(rel, ids, types, &block)
         end
       end