suggested changes

change description of organization_admin
remove assign_role callback

app/controllers/admin/organizations_controller.rb

@@ -1,7 +1,6 @@
 module Admin
   class OrganizationsController < Admin::BaseController
     load_and_authorize_resource :organization
-    after_action :assign_role, only: :create
 
     def index
       @organizations = Organization.all
@@ -46,10 +45,6 @@ module Admin
 
     private
 
-    def assign_role
-      current_user.add_role :organization_admin, @organization
-    end
-
     def organization_params
       params.require(:organization).permit(:name, :description, :picture)
     end

app/models/organization.rb

@@ -12,6 +12,6 @@ class Organization < ActiveRecord::Base
   private
 
   def create_roles
-    Role.where(name: 'organization_admin', resource: self).first_or_create(description: "For the administrators of an organization (who shall have full access to the organization and it's conferences)")
+    roles.where(name: 'organization_admin').first_or_create(description: 'For the administrators of an organization and its conferences')
   end
 end

lib/tasks/roles.rake

@@ -3,7 +3,7 @@ namespace :roles do
   task add: :environment do
 
     Organization.all.each do |org|
-      Role.where(name: 'organization_admin', resource: org).first_or_create(description: "For the administrators of an organization (who shall have full access to the organization and it's conferences)")
+      Role.where(name: 'organization_admin', resource: org).first_or_create(description: 'For the administrators of an organization and its conferences')
     end
 
     Conference.all.each do |c|