Fixes #11331: Created random generator to fetch nodes randomly as cards

app/controllers/wiki_controller.rb

@@ -60,6 +60,11 @@ def show
     if !@node.nil? # it's a place page!
       @tags = @node.tags
       @tags += [Tag.find_by(name: params[:id])] if Tag.find_by(name: params[:id])
+
+      tag1, tag2 = @node.normal_tags(:followers).includes(:tag).pluck(:name).first(2)
+
+      # get recommendations
+      @recommendations = Tag.get_recommendations(tag1, tag2)
     else # it's a new wiki page!
       @title = I18n.t('wiki_controller.new_wiki_page')
       if current_user

app/models/tag.rb

@@ -478,4 +478,34 @@ def span(start, fin)
   def range(fin, week)
     (fin.to_i - week.weeks.to_i).to_s..(fin.to_i - (week - 1).weeks.to_i).to_s
   end
+
+  def self.get_recommendations(tag1, tag2)
+
+    tag1_content_nids = find_recommended_nodes(tag1)
+    tag2_content_nids = find_recommended_nodes(tag2)
+
+    random_content_nids = tag1_content_nids.sample(3) + tag2_content_nids.sample(3)
+
+    Node.where("nid IN (?)", random_content_nids)
+  end  
+
+  def self.find_recommended_nodes(tagnames, limit = 10)
+
+    date_ranges = [1.years.ago..3.years.ago, 4.years.ago..6.years.ago, 7.years.ago..9.years.ago]
+
+    selected_date_range = date_ranges.sample(1)
+
+    nodes = Node.where("cached_likes > 20 AND views > 100", status: 1)
+                .where(created: selected_date_range)
+                .includes(:tag)
+                .references(:term_data)
+                .where('term_data.name IN (?)', tagnames)
+
+    Node.where('node.nid IN (?)', nodes.collect(&:nid))
+        .includes(:revision, :tag)
+        .references(:node_revisions)
+        .where(status: 1)
+        .limit(limit)
+        .pluck(:nid)
+  end
 end

app/views/dashboard_v2/_sidebar.html.erb

@@ -55,7 +55,20 @@
     </div>
   </div>
 </div>
-
+<div>
+<% if !@recommendations.nil? %>
+  <% @recommendations.each do |node| %>
+    <div class="card" style="width: 18rem;">
+    <img class="card-img-top" src="#" alt="Card image cap">
+    <div class="card-body">
+    <h5 class="card-title"><%= node.nid %></h5>
+    <p class="card-text">Post content here</p>
+    <a href="#" class="btn btn-primary">Read more button here</a>
+    </div>
+    </div>
+  <% end %>
+<% end %>
+</div>
 
 <style>