Question

我有一个名为“BillApp”的练习，基本上它是一个有一些产品的比尔，我应该可以制作账单，计算IVA等。

我有下一个架构：

create_table "bill_items", force: :cascade do |t|
    t.integer  "amount"
    t.integer  "product_id"
    t.integer  "bill_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["bill_id"], name: "index_bill_items_on_bill_id"
    t.index ["product_id"], name: "index_bill_items_on_product_id"
  end

  create_table "bills", force: :cascade do |t|
    t.string   "user_name"
    t.string   "dni"
    t.date     "expiration"
    t.float    "sub_total"
    t.float    "grand_total"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
  end

  create_table "products", force: :cascade do |t|
    t.string   "name"
    t.string   "description"
    t.float    "price"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
  end

比尔模特：

class Bill < ApplicationRecord
  has_many :bill_items
  has_many :products, through: :bill_items
  accepts_nested_attributes_for :bill_items
end

BillItem模型：

class BillItem < ApplicationRecord
  belongs_to :product
  belongs_to :bill
end

产品型号：

class Product < ApplicationRecord
  has_many :bill_items
  has_many :bills, through: :bill_items
end

ProductsController是一个普通的，由脚手架生成，没关系。

BillsController：

class BillsController < ApplicationController
  before_action :set_bill, only: [:show, :update, :destroy, :edit]

  def new
    @bill = Bill.new
    @bill.bill_items.build
  end

  def create
    @bill = Bill.new(bill_params)
    byebug
    @bill.save
  end

  private
    def set_bill
      @bill = Bill.find(params[:id])
    end

    def bill_params
      params.require(:bill).permit(:user_name, :dni, { bill_items_attributes: [:product_id, :amount, :bill_id] })
    end
end

最后比尔的新观点：

<%= form_for(@bill) do |f| %>
  <div>
    <%= f.label :user_name %>
    <%= f.text_field :user_name %>
  </div>
  <div>
    <%= f.label :dni %>
    <%= f.text_field :dni %>
  </div>

  <%= f.fields_for :bill_items do |fp| %>
    <div>
      <%= fp.label :product %>
      <%= fp.collection_select :product_id, Product.all, :id, :name %>
    </div>
    <div>
      <%= fp.label :amount %>
      <%= fp.number_field :amount %>
    </div>
  <% end %>

  <%= f.submit %></div>
<% end %>

问题非常具体，在rails 5中，当它试图调用@ bill.save它失败时，它显示错误：

#<ActiveModel::Errors:0x007fd9ea61ed58 @base=#<Bill id: nil, user_name: "asd", dni: "asd", expiration: nil, sub_total: nil, grand_total: nil, created_at: nil, updated_at: nil>, @messages={:"bill_items.bill"=>["must exist"]}, @details={"bill_items.bill"=>[{:error=>:blank}]}>

但它在Rails 4.2.6中完美运行。整个项目文件夹位于：https://github.com/TheSwash/bill_app 当前在分支功能/ bills_controller

中

有人知道发生了什么事吗？

Answer 1

问题是bill_items验证

在rails 5中，默认情况下需要belongs_to关联

http://blog.bigbinary.com/2016/02/15/rails-5-makes-belong-to-association-required-by-default.html

rails 5中的嵌套属性失败，但在rails 4

1 个答案: