Rails new - 错误的参数数量（0表示1）

Question

我在new

的orders_controller方法中有以下内容

@order = Order.new

Rails给出了以下错误：

wrong number of arguments (0 for 1)

app/models/order.rb:2:in `<class:Order>'
app/models/order.rb:1:in `<top (required)>'
app/controllers/orders_controller.rb:33:in `new'

我正在使用Rails 3.0.5

谢谢！

编辑：order.rb可以在下面找到

class Order < ActiveRecord::Base
  has_many :line_items, :dependent => destroy

  PAYMENT_TYPES = [ "Check", "Credit card", "Purchase order" ]

  validates :name, :address, :email, :pay_type, :presence => true
  validates :pay_type, :inclusion => PAYMENT_TYPES

  def add_line_items_from_cart(cart)
    cart.line_items.each do |item|
      item.cart_id = nil
      line_items << item
    end
  end
end

Answer 1

您的代码中有拼写错误。您错过了:

中的:destroy

将第2行中的:dependent => destroy更改为:dependent => :destroy。它应该工作。

Answer 2

order.rb中的第一个声明应为：

  has_many :line_items, :dependent => :destroy