tap/app/controllers/users_controller.rb

class UsersController < ApplicationController
  load_and_authorize_resource
  before_action :init, only: :show

  def show
  end

  def edit
  end

  def update
    if @user.update_attributes(user_params)
      flash[:success] = "Successfully updated!"
      redirect_to @user
    else
      @user.reload
      render 'edit'
    end
  end

  def edit_dagschotel
    @dagschotel = @user.dagschotel

    @products = Product.for_sale
    @categories = Product.categories
  end

  def quickpay
    order = @user.orders.build
    order.order_items.build(count: 1, product: @user.dagschotel)
    if order.save
      respond_to do |format|
        format.js { render json: { message: "Quick pay succeeded for #{@user.name}." }, status: :ok }
        format.html {
          flash[:success] = "Quick pay succeeded."
          redirect_to root_path
        }
      end
    else
      respond_to do |format|
        format.js { head :unprocessable_entity }
        format.html {
          flash[:error] = order.errors.full_messages.first
          redirect_to root_path
        }
      end
    end
  end

  private

    def user_params
      params.require(:user).permit(:avatar, :private, :dagschotel_id)
    end

    def init
      @user = User.find_by_id(params[:id]) || current_user
    end
end