ruby-on-rails - Rails 5 Active Record 记录无效错误

Question

我有两个 Rails 模型，即 Invoice 和 Invoice_details。一个Invoice_details 属于 Invoice，一个Invoice 有多个Invoice_details。我无法使用 accepts_nested_attributes_for in Invoice 通过 Invoice 模型保存 Invoice_details。

我收到以下错误:

(0.2ms)  BEGIN
(0.2ms)  ROLLBACK
Completed 422 Unprocessable Entity in 25ms (ActiveRecord: 4.0ms)         
ActiveRecord::RecordInvalid (Validation failed: Invoice details invoice must exist):
app/controllers/api/v1/invoices_controller.rb:17:in `create'

下面是 invoice.rb 的代码片段:

class Invoice < ApplicationRecord
  has_many :invoice_details
  accepts_nested_attributes_for :invoice_details
end

invoice_details.rb 的代码片段:

class InvoiceDetail < ApplicationRecord
  belongs_to :invoice
end

Controller 代码:

class Api::V1::InvoicesController < ApplicationController
  respond_to :json

  def index
    comp_id = params[:comp_id]
    if comp_id
      invoices = Invoice.where(:company_id => comp_id)
      render json: invoices, status: 201
    else
      render json: { errors: "Company ID is NULL" }, status: 422
    end
  end

  def create
    Rails.logger.debug invoice_params.inspect
    invoice = Invoice.new(invoice_params)
    if invoice.save!
      render json: invoice, status: 201
    else
      render json: { errors: invoice.errors }, status: 422
    end
  end

  def invoice_params
    params.require(:invoice).permit(:total_amount,:balance_amount, :customer_id, invoice_details_attributes:[:product_id])
  end
end

传递给 Controller ​​的原始 JSON 数据:

{
    "invoice":{
        "total_amount":"100",
        "balance_amount":"0",
        "customer_id":"1",
        "invoice_details_attributes":[{
            "product_id":"4"
        }]
    }
}

invoice_details 架构

|id | invoice_id | product_id | created_at | updated_at|

发票架构

|id| total_amount |balance_amount | generation_date | created_at | updated_at | customers_id|

Answer 1

ActiveRecord::RecordInvalid (Validation failed: Invoice details invoice must exist):

错误是由于您不允许invoice_id同时为invoice保存invoice_detail

在 Rails 5 中，默认情况下会验证关联对象的存在。您可以通过设置 optional :true

来绕过此验证

来自Guides

If you set the :optional option to true, then the presence of the associated object won't be validated. By default, this option is set to false.

解决方案:

在 invoice_params 的 invoice_details_attributes 中允许 invoice_id

def invoice_params
  params.require(:invoice).permit(:total_amount,:balance_amount, :customer_id, invoice_details_attributes: [:product_id, :invoice_id])
end

或

如果你不想，那么设置optional :true

class InvoiceDetail < ApplicationRecord
  belongs_to :invoice, optional :true
end