ruby-on-rails - HABTM 与 rails API 的关系不起作用

Question

我是 Ruby on Rails 的新手。我正在使用 Rails 5.1、事件记录序列化程序、门卫和设计 gem 制作 Rails API。

我有一个Order 表，它有很多产品。订单和产品之间是多对多的关系。

订购型号:

class Order < ApplicationRecord      
  validates_presence_of :brute, :net
  has_and_belongs_to_many :products      
end

产品型号:

class Product < ApplicationRecord
  belongs_to :category
  validates_presence_of :name, :price
  validates_uniqueness_of :name
  has_and_belongs_to_many :orders
end

我有一个名为 orders_products 的连接表。

订单序列化器:

class OrderSerializer < ActiveModel::Serializer
  attributes :id, :discount, :brute, :net, :payed, :payed_at, :products      

  def products
    object.products.map do |product|
      ProductSerializer.new(product, scope: scope, root: false, event: object)
    end
  end

end

产品序列化器:

 class ProductSerializer < ActiveModel::Serializer
  attributes :id, :name, :price, :description
  has_one :category
end

订单 Controller :

module Api
  class OrdersController < ApiController
    before_action :set_order, only: [:show, :update, :destroy]

    # GET /api/orders
    def index
      @orders = Order.all

      render json: @orders
    end

    # GET /api/orders/1
    def show
      render json: @order
    end

    # POST /api/orders
    def create
      @order = Order.new(order_params)

      if @order.save
        render json: @order, status: :created, location: api_order_url(@order)
      else
        render json: @order.errors, status: :unprocessable_entity
      end
    end

    # PATCH/PUT /api/orders/1
    def update
      if @order.present?
        if @order.update(order_params)
          render json: @order
        else
          render json: @order.errors, status: :unprocessable_entity
        end
      end
    end

    # DELETE /api/orders/1
    def destroy
      @order.destroy if @order.present?
    end

    private
    # Use callbacks to share common setup or constraints between actions.
    def set_order
      @order = Order.find(params[:id])
    rescue ActiveRecord::RecordNotFound
      Rails.logger.error{ 'Order record is not found' }
      nil
    end

    # Only allow a trusted parameter "white list" through.
    def order_params
      params.require(:order).permit(:discount, :brute, :net, :payed, :payed_at, product_ids: [])
    end
  end
end

当我从 API 生成器应用程序(如 Postman/Insomnia)发布一些订单 json 数据时，订单被保存在订单表中，但没有数据保存在 orders_products 连接表中。

我的订单 json 请求(POST http://localhost:3000/api/orders):

{
        "discount": 110,
        "brute": 100,
        "net": 200,
        "payed": null,
        "payed_at": null,          
        "product_ids": [3]
}

我试图找到解决方案，但我失败了。

Answer 1

最后我解决了你的问题。只需在你的模型中添加一个属性。

订购型号:

class Order < ApplicationRecord
  attribute :product_ids
  validates_presence_of :brute, :net
  has_and_belongs_to_many :products      
end

订单序列化器:

class OrderSerializer < ActiveModel::Serializer
  attributes :id, :discount, :brute, :net, :payed, :payed_at
  has_many :products
end

并在您的订单 api 中创建方法:

# POST /api/orders
    def create
      @order = Order.new(order_params)

      if @order.save
        # Find products
        @products = Product.where(id: order_params[:product_ids])
        # Create join table records
        @products.each { |product| product.orders << @order }

        render json: @order, status: :created, location: api_order_url(@order)
      else
        render json: @order.errors, status: :unprocessable_entity
      end
    end

我已经在本地测试过并且有效!快乐编程:)