我有一个订单模型，其中包含一个名为item_details的对象数组。
当我创建一个新订单时，我希望迭代item_details并创建包含订单id的OrderDetail的新示例。
OrderDetail是一个连接表，因此我希望在创建Order之后创建示例，以便在OrderDetails中包含order_id。
我该怎么做呢？我把item_details的数据类型设置为json，这样我就可以把它保存到我的数据库中。
之前我把它作为文本/字符串，它是保存一个符号作为字符串。
订购样品

{
    "id": 5,
    "customer_id": 1,
    "order_date": "2023-01-03",
    "total_cost": 0,
    "item_details": [
        {
            "product_id": 3,
            "quantity": 3
        },
        {
            "product_id": 9,
            "quantity": 4
        }
    ],

图式

create_table "order_details", force: :cascade do |t|
    t.integer "product_id"
    t.integer "order_id"
    t.integer "quantity"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
  end

  create_table "orders", force: :cascade do |t|
    t.integer "customer_id"
    t.string "order_date"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.json "item_details"
  end

型号

class Order < ApplicationRecord
    belongs_to :customer
    has_many :order_details
    has_many :products, through: :order_details

end

class OrderDetail < ApplicationRecord

    validates :quantity, numericality: { only_integer: true }

    belongs_to :order
    belongs_to :product  

end

串行器

class OrderSerializer < ActiveModel::Serializer
  attributes :id, :customer_id, :order_date, :total_cost, :item_details

  belongs_to :customer
  has_many :order_details
  has_many :products

  def total_cost
    cost = []
    self.object.order_details.each do |details|
      product = self.object.products.find {|product| product.id == details.product_id}
      cost << product.price * details.quantity
    end
    return cost.sum
  end

 class OrderDetailSerializer < ActiveModel::Serializer
  attributes :id, :product_id, :order_id, :quantity, :product

  belongs_to :order
  belongs_to :product
end

订单管理员

class OrdersController < ApplicationController
    wrap_parameters format: []
    skip_before_action :authorized, only: :create

    def index
        orders = Order.all
        if orders
        render json: orders
        else
            render json: {error: "Order Not Found" }, status: :not_found
        end
    end

    def show
        order = Order.find_by(id: params[:id])
        if order
            render json: order
        else
            render json: { error: "Order Not Found" }, status: :not_found
        end
    end

    def create
        order = Order.create(order_params)
        if order.valid?
            order.item_details.each do |i|
                OrderDetail.create(order_id: params[:id], product_id: i[:product_id], quantity: i[:quantity])
            end
            render json: order
        else
            render json: { errors: order.errors.full_messages }, status: :unprocessable_entity
        end
    end

    def update
        order = Order.find_by(id: params[:id])
        if order
            order.update(order_params)
            render json: order
        else
            render json: { error: "Order Not Found" }, status: :not_found
        end
    end

    def destroy
        order = Order.find_by(id: params[:id])
        if order
            order.destroy
            head :no_content
        else
            render json: {error: "Order Not Found"}, status: :not_found
        end
    end

    private

    def order_params
        params.permit(:customer_id, :order_date, item_details: [:product_id, :quantity] )
    end

end

订单详细信息控制器

class OrderDetailsController < ApplicationController

    skip_before_action :authorized, only: :create

    def index
        order_details = OrderDetail.all
        if order_details
        render json: order_details
        else
            render json: {error: "Not Found"}, status: :not_found
        end
    end

    def create
        order_detail = OrderDetail.create(order_details_params)
        if order_detail.valid?
            render json: order_detail
        else
            render json: { errors: order_detail.errors.full_messages }, status: :unprocessable_entity
        end
    end

    def update
        order_detail = OrderDetail.find_by(id: params[:id])
        if order_detail
            order_detail.update(order_details_params)
            render json: order_detail
        else
            render json: { error: "Not Found" }, status: :not_found
        end
    end

    private

    def order_details_params
        params.permit(:order_id, :product_id, :quantity)
    end

end