refactored DomainConstraint and conference_controller_spec

use params id instead of OSEM_HOSTNAME to load conference

app/controllers/conferences_controller.rb

@@ -1,7 +1,7 @@
 class ConferencesController < ApplicationController
   protect_from_forgery with: :null_session
   before_action :respond_to_options
-  load_and_authorize_resource find_by: :short_title
+  load_and_authorize_resource find_by: :short_title, except: :show
 
   def index
     @current = Conference.where('end_date >= ?', Date.current).reorder(start_date: :asc)
@@ -9,15 +9,19 @@ class ConferencesController < ApplicationController
   end
 
   def show
-    # have to change "localhost" to ENV['OSEM_HOSTNAME'] in production
-    check_custom_domain if request.host != 'localhost'
+    @conference = if params[:id]
+                    Conference.find_by_short_title(params[:id])
+                  else
+                    load_conference_by_domain
+                  end
+    authorize! :show, @conference
     @program = @conference.program
   end
 
   private
 
-  def check_custom_domain
-    @conference = @conference.nil? ? Conference.find_by(custom_domain: request.domain) : @conference
+  def load_conference_by_domain
+    Conference.find_by(custom_domain: request.domain)
   end
 
   def respond_to_options

config/initializers/domain_constraint.rb

@@ -1,6 +1,6 @@
 class DomainConstraint
   def self.matches?(request)
-  	@domains = Conference.pluck(:custom_domain).compact
-    @domains.include?(request.domain)
+    domains = Conference.where.not(custom_domain: nil).pluck(:custom_domain)
+    domains.include?(request.domain)
   end
-end
+end

spec/controllers/conferences_controller_spec.rb

@@ -23,12 +23,17 @@ describe ConferencesController do
         get :show, id: conference.short_title
         expect(response).to render_template :show
       end
+    end
 
-      it 'assigns correct conference from a custom domain' do
+    context 'accessing conference via custom domain' do
+      before do
         conference.update_attribute(:custom_domain, 'lvh.me')
         @request.host = 'lvh.me'
+      end
 
+      it 'assigns correct conference' do
         get :show
+
         expect(response).to render_template :show
         expect(assigns(:conference)).to eq conference
       end