Merge pull request #275 from mlovic/filter-topic

Allow debates to be filtered by topic

app/controllers/debates_controller.rb

@@ -1,5 +1,5 @@
 class DebatesController < ApplicationController
-  before_action :parse_order, only: :index
+  before_action :parse_order, :parse_tag_filter, only: :index
   before_action :authenticate_user!, except: [:index, :show]
 
   load_and_authorize_resource
@@ -77,4 +77,9 @@ class DebatesController < ApplicationController
       @order = @valid_orders.include?(params[:order]) ? params[:order] : 'created_at'
     end
 
+    def parse_tag_filter
+      valid_tags = ActsAsTaggableOn::Tag.all.map(&:name)
+      @tag_filter = params[:tag] if valid_tags.include?(params[:tag])
+    end
+
 end