added sorting DSL

app/controllers/default_widget_controller.rb

@@ -11,23 +11,26 @@ class DefaultWidgetController< OrbitWidgetController
   end
 
   def query_for_default_widget
-
     @ori_class_name =  @default_widget["query"].split('.')[0]
     @ori_query =  @default_widget["query"]
     result = nil
     result_objects = nil
     if !params["tag_id"].blank?
       if params["category_id"].blank? #has tag no cate
-        result =  eval("#{@ori_query}.where(:tagged_ids.in => params['tag_id'])")
+        result =  eval(@ori_query)
+        result.selector[:tagged_ids] = { "$in" => params['tag_id'].collect{|t| BSON::ObjectId(t)}}
       else #has tag and cate
-        result = eval("#{@ori_query}.where(:#{get_category_field_name}.in=>params['category_id'], :tagged_ids.in => params['tag_id'])")
+        result =  eval(@ori_query)
+        result.selector[get_category_field_name] = { "$in" => params['category_id'].collect{|t| BSON::ObjectId(t)}}
+        result.selector[:tagged_ids] = { "$in" => params['tag_id'].collect{|t| BSON::ObjectId(t)}}
       end
     elsif params["category_id"].blank?  #no tag no cate
       result = eval(@ori_query)
     else #no tag has cate
-      result = eval("#{@ori_query}.where(:#{get_category_field_name}.in=>params['category_id'])")
+      result = eval(@ori_query)
+      result.selector[get_category_field_name] = { "$in" => params['category_id'].collect{|t| BSON::ObjectId(t)}}
     end
-    result.available_for_lang(I18n.locale).can_display.desc(:created_at)
+    eval("result.#{@default_widget[:sorting_query]}")
   end
 
   def search_result
@@ -95,9 +98,9 @@ class DefaultWidgetController< OrbitWidgetController
   end
   
   def get_category_field_name
-    @ori_class_name = @ori_class_name.constantize
+    @ori_class_name = @ori_class_name.constantize unless @ori_class_name.is_a? Class
     @ori_class_name.fields.each_key do |key|
-      return key if key.include?('category_id')
+      return key.to_s if key.include?('category_id')
     end
     nil
   end