# File examples/camping-abingo-test/camping-abingo-test.rb, line 94
                def post
                        @user = User.find_by_username_and_password(input.username, input.password)

                        if @user
                                @state.user_id = @user.id

                                if @state.return_to.nil?
                                        redirect R(Welcome)
                                else
                                        return_to = @state.return_to
                                        @state.return_to = nil
                                        redirect(return_to)
                                end
                        else
                                @info = 'Wrong username or password.'
                        end
                        
                        render :signin               
                end