manages permissions for debate editing

app/controllers/debates_controller.rb

@@ -1,6 +1,7 @@
 class DebatesController < ApplicationController
   before_action :set_debate, only: [:show, :edit, :update]
-  before_action :authenticate_user!, only: [:new, :create]
+  before_action :authenticate_user!, except: [:show, :index]
+  before_action :validate_ownership, only: [:edit, :update]
 
   def index
     if params[:tag]
@@ -42,4 +43,8 @@ class DebatesController < ApplicationController
       params.require(:debate).permit(:title, :description, :tag_list, :terms_of_service)
     end
 
+    def validate_ownership
+      raise ActiveRecord::RecordNotFound unless @debate.editable_by?(current_user)
+    end
+
 end

app/views/debates/show.html.erb

@@ -35,5 +35,7 @@
   <%= render @debate.root_comments %>
 </div>
 
+<% if current_user && @debate.editable_by?(current_user) %>
   <%= link_to 'Edit', edit_debate_path(@debate) %> |
+<% end %>
 <%= link_to 'Back', debates_path %>

spec/features/debates_spec.rb

@@ -45,10 +45,33 @@ feature 'Debates' do
     expect(page).to have_content "por: #{author.name}"
   end
 
-  scenario 'Update' do
+  scenario 'Update should not be posible if logged user is not the author' do
     debate = create(:debate)
+    expect(debate).to be_editable
+    login_as(create(:user))
 
+    expect {
       visit edit_debate_path(debate)
+    }.to raise_error ActiveRecord::RecordNotFound
+  end
+
+  scenario 'Update should not be posible if debate is not editable' do
+    debate = create(:debate)
+    vote = create(:vote, votable: debate)
+    expect(debate).to_not be_editable
+    login_as(debate.author)
+
+    expect {
+      visit edit_debate_path(debate)
+    }.to raise_error ActiveRecord::RecordNotFound
+  end
+
+  scenario 'Update should be posible for the author of an editable debate' do
+    debate = create(:debate)
+    login_as(debate.author)
+
+    visit debate_path(debate)
+    click_link 'Edit'
     fill_in 'debate_title', with: 'Dimisión Rajoy'
     fill_in 'debate_description', with: 'Podríamos...'