FIX: Duplicate link message should link to the post

app/assets/javascripts/discourse/controllers/composer.js.es6

@@ -121,11 +121,12 @@ export default Ember.Controller.extend({
             const [warn, info] = linkLookup.check(href);
 
             if (warn) {
+              console.log(info);
               const body = I18n.t('composer.duplicate_link', {
                 domain: info.domain,
                 username: info.username,
-                ago: relativeAge(moment(info.posted_at).toDate(), { format: 'medium' }),
-                href
+                post_url: info.post_url,
+                ago: relativeAge(moment(info.posted_at).toDate(), { format: 'medium' })
               });
               this.appEvents.trigger('composer-messages:create', {
                 extraClass: 'custom-body',

app/models/topic_link.rb

@@ -216,21 +216,18 @@ class TopicLink < ActiveRecord::Base
   end
 
   def self.duplicate_lookup(topic)
-    builder = SqlBuilder.new("SELECT tl.url, tl.domain, u.username_lower, p.created_at
-                              FROM topic_links AS tl
-                              INNER JOIN posts AS p ON p.id = tl.post_id
-                              INNER JOIN users AS u ON p.user_id = u.id
-                              /*where*/
-                              ORDER BY p.created_at DESC
-                              LIMIT 200")
 
-    builder.where('tl.topic_id = :topic_id', topic_id: topic.id)
+    results = TopicLink
+                .includes(:post => :user)
+                .where(topic_id: topic.id).limit(200)
 
     lookup = {}
-
-    builder.exec.to_a.each do |row|
-      normalized = row['url'].downcase.sub(/^https?:\/\//, '')
-      lookup[normalized] = {domain: row['domain'], username: row['username_lower'], posted_at: row['created_at']}
+    results.each do |tl|
+      normalized = tl.url.downcase.sub(/^https?:\/\//, '')
+      lookup[normalized] = { domain: tl.domain,
+                             username: tl.post.user.username_lower,
+                             post_url: tl.post.url,
+                             posted_at: tl.post.created_at }
     end
 
     lookup

config/locales/client.en.yml

@@ -989,7 +989,7 @@ en:
       drafts_offline: "drafts offline"
 
       group_mentioned: "By mentioning {{group}}, you are about to notify <a href='{{group_link}}'>{{count}} people</a>."
-      duplicate_link: "It looks like your link to <b>{{domain}}</b> was already posted in the topic by <b>@{{username}}</b> in <a href='{{href}}'>an earlier reply on {{ago}}</a>"
+      duplicate_link: "It looks like your link to <b>{{domain}}</b> was already posted in the topic by <b>@{{username}}</b> in <a href='{{post_url}}'>an earlier reply on {{ago}}</a>"
 
       error:
         title_missing: "Title is required"

spec/models/topic_link_spec.rb

@@ -286,6 +286,7 @@ http://b.com/#{'a'*500}
         expect(ch[:domain]).to eq('www.codinghorror.com')
         expect(ch[:username]).to eq(post.username)
         expect(ch[:posted_at]).to be_present
+        expect(ch[:post_url]).to be_present
       end
 
       it 'has the correct results' do