Don't track links within discourse unless they're to other topics.

app/models/topic_link.rb

@@ -49,6 +49,9 @@ class TopicLink < ActiveRecord::Base
             route = Rails.application.routes.recognize_path(parsed.path)
             topic_id = route[:topic_id]
             post_number = route[:post_number] || 1
+
+            # We aren't interested in tracking internal links to non-topics
+            next unless topic_id
           end
 
           # Skip linking to ourselves

spec/models/topic_link_spec.rb

@@ -44,31 +44,9 @@ describe TopicLink do
 
   end
 
-  describe 'domain-less link' do 
-    let(:post) { @topic.posts.create(user: @user, raw: "<a href='/users'>hello</a>") }
-    let!(:link) do 
-      TopicLink.extract_from(post)
-      @topic.topic_links.first
-    end
-
-    it 'is extracted' do 
-      link.should be_present 
-    end
-
-    it 'has the correct domain' do 
-      link.domain.should == test_uri.host
-    end
-
-    it "is not destroyed when we call extract from again" do
-      TopicLink.extract_from(post)
-      link.reload
-      link.should be_present
-    end
-
-  end
-
   describe 'internal links' do
 
+    context 'topic link' do
       before do
         @other_topic = Fabricate(:topic, user: @user)
         @other_post = @other_topic.posts.create(user: @user, raw: "some content")
@@ -165,6 +143,31 @@ describe TopicLink do
 
     end
 
+    context "link to a non-topic on discourse" do
+      let(:post) { @topic.posts.create(user: @user, raw: "<a href='/users/#{@user.username_lower}'>user</a>") }
+      before do
+        TopicLink.extract_from(post)
+      end
+
+      it 'does not extract a link' do 
+        @topic.topic_links.should be_blank
+      end
+    end
+
+    context "@mention links" do
+      let(:post) { @topic.posts.create(user: @user, raw: "Hey @#{@user.username_lower}") }
+
+      before do
+        TopicLink.extract_from(post)
+      end
+
+      it 'does not extract a link' do 
+        @topic.topic_links.should be_blank
+      end
+    end    
+   
+  end
+
   describe 'internal link from pm' do 
     before do 
       @pm = Fabricate(:topic, user: @user, archetype: 'private_message')