Implement questions answered vs questions asked

app/controllers/questions_controller.rb

@@ -19,6 +19,7 @@ def filter_questions_by_tag(questions, tagnames)
   public
 
   def index
+    @stats = helpers.filtering(params[:period])
     @title = 'Questions and Answers'
     set_sidebar
     @questions = Node.questions

app/helpers/questions_helper.rb

@@ -0,0 +1,25 @@
+module QuestionsHelper
+  SORTING_OPTIONS = %w(All Week Month Year).freeze
+
+  def filtering(period)
+    return if period.nil?
+
+    if period == 'All'
+      Rails.cache.fetch("all_stats", expires_in: 1.days) do
+        @asked = Node.questions.to_a.size
+        @answered = Answer.all.map(&:node).uniq.size
+        "#{@asked} questions asked and #{@answered} questions answered"
+      end
+    else
+      Rails.cache.fetch("#{period}_stats", expires_in: 1.days) do
+        @asked = Node.questions.where('created >= ?', 1.send(period.downcase).ago.to_i).to_a.size
+        @answered = Answer.where("created_at >= ?", 1.send(period.downcase).ago).map(&:node).uniq.size
+        "#{@asked} questions asked and #{@answered} questions answered in the past #{period}"
+      end
+    end
+  end
+
+  def options
+    SORTING_OPTIONS
+  end
+end

app/views/questions/index.html.erb

@@ -1,4 +1,14 @@
 <div class="col-md-12">
+    <div class ="row">
+        <div class="col-md-6" >
+            <h4><b> <%= @stats if params[:period].present?  %></b></h4>
+        </div>
+        <div class="col-md-4">
+            <%= form_tag request.url, :method => 'get'  do %>
+                <%= select_tag :period, options_for_select(options),onchange: "this.form.submit();", include_blank: "Filter stats", class: "form-control"%>
+            <% end %>
+        </div>
+    </div>
 
   <% if params[:action] == 'answered' %>
   <h2>Recently Answered <small class="hidden-sm">Recently answered questions</small></h2>
@@ -14,7 +24,7 @@
       <%= feature('questions-header') %>
     <% end %>
   </div>
-  <% end %>                                   
+  <% end %>
 
   <hr />