附件按tag查询时，只查选定项目中的附件

app/controllers/tags_controller.rb

@@ -178,7 +178,8 @@ private
     attachments_results = nil
     @obj_pages = nil
     @obj = nil
-  
+    @result = nil
+    
     # 这里为了提高系统的响应速度 把搜索结果放到case中去了
     case obj_flag
     when '1' then
@@ -198,7 +199,11 @@ private
       @obj_pages,@forums_results,@results_count = for_pagination(get_forums_by_tag(selected_tags))
     when '6'
       @obj = Attachment.find_by_id(obj_id)
-      @obj_pages, attachments_results, @results_count = for_pagination(get_attachments_by_tag(selected_tags))
+      
+      # modifed by Long Jun
+      # this is used to find the attachments that came from the same project and tagged with the same tag.
+      @result = get_attachments_by_project_tag(selected_tags, @obj)
+      @obj_pages, attachments_results, @results_count = for_pagination(@result)
     else
        @obj = nil
     end

app/helpers/attachments_helper.rb

@@ -85,6 +85,22 @@ module AttachmentsHelper
     Attachment.tagged_with(tag_name).order('created_on desc')
   end
 
+  # this method is used to get all attachments that from one project and tagged one tag
+  # added by Long Jun
+   def get_attachments_by_project_tag(tag_name, obj)
+     @project_id =nil
+     if obj.container_type == 'Version'
+         @project_id = Version.find(obj.container_id).project_id
+       
+    elsif obj.container_type == 'Project'
+        @project_id = obj.container_id
+       
+     end
+      Attachment.tagged_with(tag_name).order('created_on desc').where("(container_id = :project_id and container_type = 'Project') or
+            (container_id in (select id from versions where project_id =:project_id) and container_type = 'Version')", {:project_id => @project_id})
+  end
+
+
   def render_attachments_for_new_project(project, limit=nil)
     # 查询条件
     params[:q] ||= ""