querying correctly in tagscontroller to include posts with comments containing hashtag

app/controllers/tags_controller.rb

@@ -56,11 +56,18 @@ class TagsController < ApplicationController
       @posts = StatusMessage.where(:public => true, :pending => false)
     end
 
-    @posts = @posts.tagged_with(params[:name])
+    @tag = ActsAsTaggableOn::Tag.where(:name => params[:name]).first
+    if @tag
+      @posts = @posts.joins("LEFT OUTER JOIN comments ON comments.post_id = posts.id").
+                      joins("INNER JOIN taggings ON (taggings.tag_id = #{@tag.id} AND 
+                             ((taggable_id = posts.id AND taggable_type = 'Post') OR (taggings.taggable_type = 'Comment' AND taggings.taggable_id = comments.id)))")
 
-    max_time = params[:max_time] ? Time.at(params[:max_time].to_i) : Time.now
-    @posts = @posts.where(StatusMessage.arel_table[:created_at].lt(max_time))
-    @posts = @posts.includes({:comments => {:author => :profile}}, :photos).order('posts.created_at DESC').limit(15)
+      max_time = params[:max_time] ? Time.at(params[:max_time].to_i) : Time.now
+      @posts = @posts.where(StatusMessage.arel_table[:created_at].lt(max_time))
+      @posts = @posts.includes({:comments => {:author => :profile}}, :photos).order('posts.created_at DESC').limit(15)
+    else
+      @posts = []
+    end
 
     @posts = PostsFake.new(@posts)
     @commenting_disabled = true

spec/controllers/tags_controller_spec.rb

@@ -69,6 +69,20 @@ describe TagsController do
         get :show, :name => 'hello'
         assigns(:posts).models.should == [stranger_post]
       end
+
+      it 'displays a post with a comment containing the tag search' do
+        bob.post(:status_message, :text => "other post y'all", :to => 'all')
+        other_post = bob.post(:status_message, :text => "sup y'all", :to => 'all')
+        Factory(:comment, :text => "#hello", :post => other_post)
+        get :show, :name => 'hello'
+        assigns(:posts).models.should == [other_post]
+        response.status.should == 200
+      end
+
+      it 'succeeds without posts' do
+        get :show, :name => 'hellyes'
+        response.status.should == 200
+      end
     end
 
     context "not signed in" do