Allow to order search results by the topic creation date

based on: https://meta.discourse.org/t/allow-to-order-search-results-by-the-topic-creation-date/38544

app/assets/javascripts/discourse/controllers/full-page-search.js.es6

@@ -11,6 +11,8 @@ const SortOrders = [
   {name: I18n.t('search.latest_post'), id: 1, term: 'order:latest'},
   {name: I18n.t('search.most_liked'), id: 2, term: 'order:likes'},
   {name: I18n.t('search.most_viewed'), id: 3, term: 'order:views'},
+  {name: I18n.t('search.latest_topic'), id: 4, term: 'order:latest_topic'},
+
 ];
 
 export default Ember.Controller.extend({
@@ -90,7 +92,9 @@ export default Ember.Controller.extend({
     this._searchOnSortChange = false;
     if (term) {
       SortOrders.forEach(order => {
-        if (term.indexOf(order.term) > -1){
+        let term_start      = term.indexOf(order.term)
+        let char_after_term = term[term_start + (order.term || '').length]
+        if (term_start > -1 && (!char_after_term || char_after_term.match(/\s/))){
           this.set('sortOrder', order.id);
           term = term.replace(order.term, "");
           term = term.trim();

config/locales/client.en.yml

@@ -1276,6 +1276,7 @@ en:
       sort_by: "Sort by"
       relevance: "Relevance"
       latest_post: "Latest Post"
+      latest_topic: "Latest Topic"
       most_viewed: "Most Viewed"
       most_liked: "Most Liked"
       select_all: "Select All"

lib/search.rb

@@ -477,6 +477,9 @@ class Search
         if word == 'order:latest'
           @order = :latest
           nil
+        elsif word == 'order:latest_topic'
+          @order = :latest_topic
+          nil
         elsif word =~ /topic:(\d+)/
           topic_id = $1.to_i
           if topic_id > 1
@@ -680,6 +683,12 @@ class Search
         else
           posts = posts.order("posts.created_at DESC")
         end
+      elsif @order == :latest_topic
+        if opts[:aggregate_search]
+          posts = posts.order("MAX(topics.created_at) DESC")
+        else
+          posts = posts.order("topics.created_at DESC")
+        end
       elsif @order == :views
         if opts[:aggregate_search]
           posts = posts.order("MAX(topics.views) DESC")

spec/components/search_spec.rb

@@ -613,7 +613,28 @@ describe Search do
 
       expect(Search.execute('sam').posts.map(&:id)).to eq([post1.id, post2.id])
       expect(Search.execute('sam order:latest').posts.map(&:id)).to eq([post2.id, post1.id])
+    end
 
+    it 'can order by topic creation' do
+      today        = Date.today
+      yesterday    = 1.day.ago
+      two_days_ago = 2.days.ago
+
+      old_topic    = Fabricate(:topic,
+          title: 'First Topic, testing the created_at sort',
+          created_at: two_days_ago)
+      latest_topic = Fabricate(:topic,
+          title: 'Second Topic, testing the created_at sort',
+          created_at: yesterday)
+
+      old_relevant_topic_post     = Fabricate(:post, topic: old_topic, created_at: yesterday, raw: 'Relevant Topic')
+      latest_irelevant_topic_post = Fabricate(:post, topic: latest_topic, created_at: today, raw: 'Not Relevant')
+
+      # Expecting the default results
+      expect(Search.execute('Topic').posts.map(&:id)).to eq([old_relevant_topic_post.id, latest_irelevant_topic_post.id])
+
+      # Expecting the ordered by topic creation results
+      expect(Search.execute('Topic order:latest_topic').posts.map(&:id)).to eq([latest_irelevant_topic_post.id, old_relevant_topic_post.id])
     end
 
     it 'can tokenize dots' do