adds user's public show page

app/controllers/users_controller.rb

@@ -0,0 +1,54 @@
+class UsersController < ApplicationController
+  has_filters %w{proposals debates comments}, only: :show
+
+  load_and_authorize_resource
+
+  before_action :set_activity_counts, only: :show
+
+  def show
+    load_filtered_activity
+  end
+
+  private
+    def set_activity_counts
+      @activity_counts = HashWithIndifferentAccess.new(
+                          proposals: Proposal.where(author_id: @user.id).count,
+                          debates: Debate.where(author_id: @user.id).count,
+                          comments: Comment.where(user_id: @user.id).count)
+    end
+
+    def load_filtered_activity
+      case params[:filter]
+      when "proposals" then load_proposals
+      when "debates"   then load_debates
+      when "comments"  then load_comments
+      else load_available_activity
+      end
+    end
+
+    def load_available_activity
+      if @activity_counts[:proposals] > 0
+        load_proposals
+        @current_filter = "proposals"
+      elsif  @activity_counts[:debates] > 0
+        load_debates
+        @current_filter = "debates"
+      elsif  @activity_counts[:comments] > 0
+        load_comments
+        @current_filter = "comments"
+      end
+    end
+
+    def load_proposals
+      @proposals = Proposal.where(author_id: @user.id).order(created_at: :desc).page(params[:page])
+    end
+
+    def load_debates
+      @debates = Debate.where(author_id: @user.id).order(created_at: :desc).page(params[:page])
+    end
+
+    def load_comments
+      @comments = Comment.where(user_id: @user.id).includes(:commentable).order(created_at: :desc).page(params[:page])
+    end
+
+end