Rails - BookingsController中的ArgumentError＃创建错误数量的参数（给定1，预期2..3）

Question

我真的在我的Rails应用上苦于上述错误。它突出了登记控制器，特别是“创造”的行动，这部分 -

if (@event.bookings.sum(&:quantity) + @booking.quantity) > @event.number_of_spaces 
     flash[:warning] = "Sorry, this event is fully booked." 
     redirect_to event_path(@event) 
    end 

下面是完整的控制器代码 -

bookings_controller.rb

class BookingsController < ApplicationController 

before_action :authenticate_user! 

def new 
    # booking form 
    # I need to find the event that we're making a booking on 
    @event = Event.find(params[:event_id]) 
    # and because the event "has_many :bookings" 
    @booking = @event.bookings.new 
    # which person is booking the event? 
    @booking.user = current_user 
    @booking.quantity = @booking.quantity 
    @total_amount = @booking_quantity.to_f * @event_price.to_f 

end 

def create 
     # actually process the booking 
     @event = Event.find(params[:event_id]) 
     @booking = @event.bookings.new(booking_params) 
     @booking.user = current_user 
     #@total_amount = @booking.quantity.to_f * @event.price.to_f 

    if (@event.bookings.sum(&:quantity) + @booking.quantity) > @event.number_of_spaces 
     flash[:warning] = "Sorry, this event is fully booked." 
     redirect_to event_path(@event) 
    end 

    if @booking.save 
     if @event.is_free? 
     flash[:success] = "Your place on our event has been booked" 
     redirect_to event_path(@event) 
    else 
     begin 
      # CHARGE THE USER WHO'S BOOKED 
      Stripe::Charge.create(
       amount: @event.price_pennies, 
       currency: "gbp", 
       source: @booking.stripe_token, 
       description: "Booking number #{@booking.id}" 
      ) 

      flash[:success] = "Your place on our event has been booked" 
      redirect_to event_path(@event) 
     rescue => e 
      @booking.destroy # delete the entry we have just created 
      flash[:error] = "Payment unsuccessful" 
      render "new" 
     end 
    end 
    end 
end 


private 

def booking_params 
    params.require(:booking).permit(:stripe_token, :quantity) 
end 



end 

错误弹出，当我试图完成测试预订。

Answer 1

的问题是这样的：

@event.bookings.sum(&:quantity) 

我想你正试图确定预订的总量为特定的事件？

一个很好的办法做到这一点是：

@event.bookings.reduce(0) { |i, b| i + b.quantity } 

，当然还有，这应该是在事件模型的方法，而不是在控制器：

class Event < ActiveRecord::Base 

    ... 

    def total_bookings 
    self.bookings.reduce(0) { |i, b| i + b.quantity } 
    end 
end 

然后是在你的控制器线变成

if (@event.total_bookings + @booking.quantity) > @event.number_of_spaces