suggested changes that includes:

moving actions for custom domain in its own controller
use separate service class for custom domains
updated help text for custom domains
increased test coverage for custom domains

app/controllers/admin/conference_domains_controller.rb

@@ -0,0 +1,33 @@
+module Admin
+  class ConferenceDomainsController < Admin::BaseController
+    load_and_authorize_resource :conference, find_by: :short_title
+
+    def show
+      # To only allow organizers, organization admin and site administrators
+      authorize! :update, @conference
+      redirect_to admin_conference_conference_domains_edit_path(@conference.short_title) unless @conference.custom_domain.present?
+    end
+
+    def edit
+      authorize! :edit, @conference
+    end
+
+    def update
+      authorize! :update, @conference
+      @conference.assign_attributes(conference_params)
+      if @conference.save
+        redirect_to admin_conference_conference_domain_path(@conference.short_title),
+                    notice: 'Attached new domain name to conference. This does not mean that the new domain should work. Please make sure you follow step 3 to point your domain to this hosted version'
+      else
+        redirect_to admin_conference_conference_domains_edit_path(@conference.short_title),
+                    notice: 'Failed to add the new domain as custom domain to the conference'
+      end
+    end
+
+    private
+
+    def conference_params
+      params.require(:conference).permit(:custom_domain)
+    end
+  end
+end

app/controllers/admin/conferences_controller.rb

@@ -4,23 +4,6 @@ module Admin
     load_resource :program, through: :conference, singleton: true, except: :index
     load_resource :user, only: [:remove_user]
 
-    def custom_domain
-      redirect_to attach_custom_domain_admin_conference_path(@conference.short_title) unless @conference.custom_domain.present?
-    end
-
-    def attach_custom_domain; end
-
-    def update_domain
-      @conference.assign_attributes(conference_params)
-      if @conference.save
-        redirect_to custom_domain_admin_conference_path(id: @conference.short_title),
-                    notice: 'Added new domain name to conference. This does not mean that the new domain should work. Please make sure you follow step 2 to point your domain to this hosted version'
-      else
-        redirect_to custom_domain_admin_conference_path(id: @conference.short_title),
-                    notice: 'Failed to add the new domain as custom domain to the conference'
-      end
-    end
-
     def index
       # Redirect to new form if there is no conference
       if Conference.count == 0

app/models/admin_ability.rb

@@ -110,7 +110,7 @@ class AdminAbility
     track_ids = Track.joins(:program).where('programs.conference_id IN (?)', conf_ids).pluck(:id)
 
     can :manage, Resource, conference_id: conf_ids
-    can [:read, :update, :destroy, :custom_domin], Conference, id: conf_ids
+    can [:read, :update, :destroy], Conference, id: conf_ids
     can :manage, Splashpage, conference_id: conf_ids
     can :manage, Contact, conference_id: conf_ids
     can :manage, EmailSettings, conference_id: conf_ids

app/models/conference.rb

@@ -92,28 +92,6 @@ class Conference < ActiveRecord::Base
     user.present? && registrations.where(user_id: user.id).count > 0
   end
 
-  ##
-  # Checks if domain correctly points to the hosted version
-  # This feature is enabled only if ENV['OSEM_HOSTNAME'] is present
-  #
-  # ====Returns
-  # * +true+ -> If the custom domain has a CNAME record for the hosted version
-  # * +false+ -> If the custom domain does not have a CNAME record for the hosted version
-  def check_custom_domain
-    require 'resolv'
-
-    unless ENV['OSEM_HOSTNAME'].nil?
-      cname_record = Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME)
-      if cname_record.present?
-        return ENV['OSEM_HOSTNAME'] == Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME).first.name.to_s
-      else
-        return false
-      end
-    end
-
-    '--feature disabled--'
-  end
-
   ##
   # Delete all EventSchedules that are not in the hours range
   # After the conference has been successfully updated

app/services/conference_domains_service.rb

@@ -0,0 +1,27 @@
+class ConferenceDomainsService
+  def initialize(params)
+    @conference = params[:conference]
+  end
+
+  ##
+  # Checks if domain correctly points to the hosted version
+  # This feature is enabled only if ENV['OSEM_HOSTNAME'] is present
+  #
+  # ====Returns
+  # * +true+ -> If the custom domain has a CNAME record for the hosted version
+  # * +false+ -> If the custom domain does not have a CNAME record for the hosted version
+  def check_custom_domain
+    require 'resolv'
+
+    unless ENV['OSEM_HOSTNAME'].nil?
+      cname_record = Resolv::DNS.new.getresources(@conference.custom_domain, Resolv::DNS::Resource::IN::CNAME)
+      if cname_record.present?
+        return ENV['OSEM_HOSTNAME'] == Resolv::DNS.new.getresources(custom_domain, Resolv::DNS::Resource::IN::CNAME).first.name.to_s
+      else
+        return false
+      end
+    end
+
+    '--feature disabled--'
+  end
+end

app/views/admin/conference_domains/edit.haml

@@ -17,7 +17,7 @@
       Step 2:
     %p
       Enter your existing domain in the field below to point the domain to your conference splashpage.
-      = semantic_form_for(@conference, url: update_domain_admin_conference_path(@conference.short_title)) do |f|
+      = semantic_form_for(@conference, url: admin_conference_conference_domain_path(@conference.short_title)) do |f|
         = f.input :custom_domain, label: false
         = f.action :submit, button_html: { class: 'btn btn-primary', value: 'Attach this domain' }
         %h2

app/views/admin/conference_domains/show.haml

@@ -17,7 +17,7 @@
           %td
             = @conference.custom_domain
           %td
-            - ck_domain = @conference.check_custom_domain
+            - ck_domain = ConferenceDomainsService.new(conference: @conference).check_custom_domain
             - if ck_domain == true
               %span.glyphicon.glyphicon-ok
             - elsif ck_domain == false
@@ -27,14 +27,14 @@
                 = ck_domain
           %td
             .btn-group
-              = link_to 'Edit', attach_custom_domain_admin_conference_path(@conference.short_title),
+              = link_to 'Edit', admin_conference_conference_domains_edit_path(@conference.short_title),
                 method: :get, class: 'btn btn-primary'
               = link_to 'Delete', admin_conference_path(@conference.short_title),
                 method: :delete, class: 'btn btn-danger'
 .row
   .col-md-9.text-right
     = link_to '#status-help', class: 'btn btn-default',  "data-toggle"=>"collapse" do
-      Help?
+      Need Help?
 .row
   .col-md-12
     .collapse#status-help
@@ -42,7 +42,7 @@
         Instructions to add your own domain
       %hr
       %p
-        When you created the conference, the conference splash page is available in the following domain:
+        Normally, your conference's splash page is available at:
         %strong
           osem.io/conferences/#{@conference.short_title}
       %p
@@ -66,9 +66,13 @@
         %li
           Pick a domain you want to host your conference on from a domain registrar or register it with a domain registrar.
         %li
-          Add your own domain name to OSEM ( link to conference/custom_domain#create ) and select the conference it should belong to.
+          Add your own domain name to OSEM
+          = link_to 'here', admin_conference_conference_domains_edit_path(id: @conference.short_title)
         %li
-          The last step is adding a CNAME record in your registrar’s DNS Settings. Different registrars have different ways of adding a CNAME record. The following guides would help you setup a CNAME record depending upon the registrar of your domain. If it doesn’t, you probably should get in touch with your domain registrar and ask him how to register a CNAME record in their platform.
+          The last step is adding a CNAME record in your registrar’s DNS Settings.
+          Different registrars have different ways of adding a CNAME record.
+          The following guides would help you setup a CNAME record depending upon the registrar of your domain.
+          If it doesn’t, you probably should get in touch with your domain registrar and ask him how to register a CNAME record in their platform.
           %ul
             %li
               = link_to 'GoDaddy', 'https://in.godaddy.com/help/add-a-cname-record-19236'

app/views/layouts/_admin_sidebar.html.haml

@@ -29,7 +29,7 @@
         Dashboard
   - if can? :edit, @conference
     %li
-      = link_to(custom_domain_admin_conference_path(@conference.short_title))  do
+      = link_to(admin_conference_conference_domain_path(@conference.short_title))  do
         %span.fa.fa-link
         Custom domain
   - if can? :show, @conference