application_controller.rb
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	class ApplicationController < ActionController::Base
	# Prevent CSRF attacks by raising an exception.
	# For APIs, you may want to use :null_session instead.
	protect_from_forgery with: :exception

	attr_writer :breadcrumb
	helper_method :admin?

	def admin?
	not params.key?(:user)
	end

	def admin_only!
	return if admin?

	redirect_to root_path, alert: 'Admin only area!'
	end

	private

	def group
	@group \|\|= group_scope.find(params[:group_id] \|\| params[:id])
	end

	def domain
	@domain \|\|= domain_scope.find(params[:domain_id] \|\| params[:id])
	end

	def record
	@record \|\|= record_scope.find(params[:record_id] \|\| params[:id])
	end

	def group_scope
	@group_scope \|\|= admin? ? Group.all : current_user.groups
	end

	def domain_scope
	@domain_scope \|\|= admin? ? Domain.all : Domain.where(group: group_scope)
	end

	def record_scope
	@record_scope \|\|= domain.records
	end

	end