Question

我有两个Rails模型，即发票和 Invoice_details 。 Invoice_details属于 发票，发票包含许多Invoice_details。 我无法使用 Accept_nested_attributes_for in Invoice 通过发票模型保存 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'

以下是invoice.rb的代码段：

class Invoice < ApplicationRecord
  has_many :invoice_details
  accepts_nested_attributes_for :invoice_details
end

invoice_details.rb的代码段：

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

传递给控制器的原始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（验证失败：发票详细信息发票必须存在）：

错误是由于您在invoice_id

保存invoice_detail时不允许 invoice

在 Rails 5 中，默认情况下将验证相关对象的存在。您可以通过设置optional :true

来绕过此验证

来自Guides

如果将：optional选项设置为true，则表示存在相关对象无法验证。默认情况下，此选项已设置为假。

<强> 解决方案：

invoice_id invoice_details_attributes

中的invoice_params允许

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

optional :true

OR

如果您不愿意，请设置class InvoiceDetail < ApplicationRecord belongs_to :invoice, optional :true end

<?php
$url = 'http://server.com/image.psd';
$data = json_decode(file_get_contents('http://api.rest7.com/v1/image_convert.php?url=' . $url . '&format=png'));

if (@$data->success !== 1)
{
    die('Failed');
}
$image = file_get_contents($data->file);
file_put_contents('rendered_page.png', $image);

Answer 2

当我通过使用明确声明两个模型之间的双向关系时，我仍然不知道上述事情无效的原因inverse_of。

class Invoice < ApplicationRecord
  has_many :invoiceDetails, inverse_of: :invoice
  accepts_nested_attributes_for :invoiceDetails
end

Rails 似乎没有在 invoice_details 上设置发票属性，然后尝试保存它，触发验证错误。这有点令人惊讶，因为其他 has_many 关系应该具有相同的保存机制并且工作得很好。

经过一段谷歌搜索后，我发现在旧版本的Rails中发生这种行为的帖子很少，我不知道新版本中是否仍然存在。可以在以下链接中查看：

https://github.com/rails/rails/issues/6161#issuecomment-8615049

https://github.com/rails/rails/pull/7661#issuecomment-8614206

https://github.com/rails/rails/issues/6161#issuecomment-6330795

Rails 5活动记录记录无效错误

2 个答案: