invitations_controller.rb
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	class InvitationsController < ApplicationController
	before_action :fetch_invitation, only: [:accept]

	# POST /invitations
	def create
	invitation = Invitation.new(fetch_params)
	if invitation.save
	invitation.notify_user
	flash[:success] = "User #{invitation.user.username} has been invited to the client"
	else
	flash[:alert] = 'Invitation not created'
	end

	redirect_to :back
	end

	# GET /invitations/:host_id/:verification_code
	def accept
	return redirect_to root_path unless @invitation
	host = @invitation.host
	if !@invitation.host.users.include? @invitation.user
	if @invitation.host.users << @invitation.user
	@invitation.destroy
	end
	else
	@invitation.destroy
	end

	redirect_to client_path(host.client)
	end

	private

	def fetch_params
	params.require(:invitation).permit(:user_id, :host_id)
	end

	def fetch_invitation
	@invitation = Invitation.find_by(host_id: params[:host_id],
	verification_code: params[:verification_code])
	end
	end