在创建优惠券实例时，/charges处的NoMethodError未定义nil:NilClass的方法‘coupon’

Question

请在用户付款后，我正在尝试为我的费用控制器中的特定票证创建优惠券，但我一直收到此错误；在/charges未定义方法‘NoMethodError’的nil:NilClass。有什么帮助吗？下面是我的代码；

票证模型

class Ticket < ApplicationRecord
 belongs_to :event
 has_many :order_items, dependent: :destroy
 has_many :coupons, dependent: :destroy

 before_save :set_ticket_sku


 def ticket_sku
  self.sku = SecureRandom.hex
 end



  private
   def set_ticket_sku
      self[:sku] = ticket_sku
   end
  end

优惠券模型

class Coupon < ApplicationRecord
 belongs_to :ticket
 before_save :set_code

  def generate_code
    self.code = SecureRandom.hex
  end



 private
  def set_code
    self[:code] = generate_code
  end
end

费用控制器

class ChargesController < ApplicationController
skip_after_action :verify_authorized
before_action :authenticate_user!

def new
    
end


def create
    @order = current_order
    @order_items = @order.order_items.last 
    @amount = @order.subtotal_in_cents
    @ticket = Ticket.find_by(sku: params[:sku]) 
    @quantity = @order_items.quantity
    
    customer = Stripe::Customer.create({
        email: params['stripeEmail'],
        source: params['stripeToken']
    })

    charge = Stripe::Charge.create({
        customer: customer.id,
        amount: @amount,
        description: "Event Payment",
        currency: 'usd'
    })

    @quantity.times do 
        @ticket.coupons.create!
    end
    redirect_to root_path

rescue Stripe::CardError => e
    flash[:error] = e.message
    redirect_to new_charge_path
end

结束

Answer 1

在充电控制器参数中:sku为零