Exclude current topic from recent topics list of the node

Fixed ruby-china#180

Author: ashchan

app/cells/topics_cell.rb

@@ -45,7 +45,7 @@ def sidebar_for_node_recent_topics(args = {})
     topic = args[:topic]
     limit = topic.replies_count > 20 ? 20 : topic.replies_count
     limit = 1 if limit == 0
-    @topics = topic.node.topics.recent.limit(limit)
+    @topics = topic.node.topics.recent.not_in(id: [topic.id]).limit(limit)
     render
   end
 

spec/cells/topics_cell_spec.rb

@@ -73,7 +73,13 @@
   describe "sidebar_for_node_recent_topics" do
     let(:node) { Factory(:node) }
     let(:topic0) { Factory(:topic, :node => node) }
+
+    it "should not render if node only has one topic" do
+      render_cell(:topics, :sidebar_for_node_recent_topics, :topic => topic0).should_not have_css("div.box ul li")
+    end
+
     it "should render" do
+      topic1 = Factory(:topic, :node => node)
       render_cell(:topics, :sidebar_for_node_recent_topics, :topic => topic0).should have_css("div.box ul li", :count => 1)
     end
 
@@ -82,6 +88,7 @@
       reply1 = Factory(:reply, :topic => topic0)
       reply2 = Factory(:reply, :topic => topic0)
       topic1 = Factory(:topic, :node => node)
+      topic2 = Factory(:topic, :node => node)
       render_cell(:topics, :sidebar_for_node_recent_topics, :topic => topic0).should have_css("div.box ul li", :count => 2)
     end
   end