Adds Mongoid backend for UntiedConsumerSync.

lib/untied-consumer-sync-mongoid.rb

@@ -1,10 +1,11 @@
 require "untied-consumer-sync-mongoid/version"
+require "untied-consumer-sync-mongoid/backend/mongoid"
+require "untied-consumer-sync"
 
 module Untied
   module Consumer
     module Sync
       module Mongoid
-        # Your code goes here...
       end
     end
   end

lib/untied-consumer-sync-mongoid/backend/mongoid.rb

@@ -0,0 +1,26 @@
+require "untied-consumer-sync"
+
+module Untied
+  module Consumer
+    module Sync
+      module Backend
+        module Mongoid
+          class ModelHelper
+            include Sync::Backend::Base
+
+            # Public: Finds the instance by the id.
+            #
+            # id - Integer that identifies the objects according to config file.
+            #
+            # Returns the instance (if exists in the database) or nil.
+            def find(id)
+              # Used where so no exception will be raised if the instance
+              # does not exist.
+              @model.unscoped.where(@model_data['mappings']['id'].to_sym => id).first
+            end
+          end
+        end
+      end
+    end
+  end
+end

spec/mongoid_spec.rb

@@ -0,0 +1,7 @@
+require 'spec_helper'
+
+module Untied::Consumer::Sync::Backend::Mongoid
+  describe  ModelHelper do
+    it_behaves_like 'a untied-consumer-sync backend'
+  end
+end