在ActiveModel :: Serializer中序列化错误哈希 [英] Serializing the errors hash in ActiveModel::Serializer

问题描述

我正在使用ActiveModel :: Serializer为我的API自定义JSON响应.在大多数情况下，这种方法都可以正常工作，除非无法成功保存模型.

I'm using ActiveModel::Serializer to customize the JSON responses for my API. This works fine in most cases, except when it fails to save a model successfully.

例如，

def create
  def create
    book = Book.new(book_params)
    book.save

    respond_with book, location: nil
  end
end

据我所知，response_with操作基本上将执行如下所示的代码(以生成响应).

As I understand it, the respond_with action will basically execute code that looks something like this (in order to generate the response).

  if resource.errors.any?
    render json: {:status => 'failed', :errors => resource.errors}
  else
    render json: {:status => 'created', :object => resource}
  end

这确实与我看到的内容匹配-如果我的模型无法成功保存，我将看到错误哈希作为响应.但是，我不知道如何为错误哈希指定序列化器.

This does match up with what I'm seeing - if my model fails to save successfully I see the errors hash as the response. However, I can't figure out how I specify a serializer for the errors hash.

我尝试定义ErrorsSerializer，如果我运行

I tried defining an ErrorsSerializer and if I run

ActiveModel::Serializer.serializer_for(book.errors)

在控制台中，似乎找到了我的序列化器，但没有被使用.在这种情况下如何自定义JSON响应?

in the console it seems to find my serializer, but it doesn't get used. How do I customize the JSON response in this scenario?

推荐答案

我相信在这种情况下的问题是，对于failed状态，您不会像对象一样调用render，例如created状态.

I believe that the problem in this case is that for the failed status you won't call render with an object, like for created status.

您可以在调用render时使用自定义的序列化程序，在这种情况下，您可能可以使用类似的

You can use a custom Serializer when calling render, for this case you can probably use something like

if resource.errors.any?
  render serializer: ErrorSerializer, json: {:status => 'failed', :errors => resource.errors}
else
  render json: {:status => 'created', :object => resource}
end

尝试一下，让我们知道结果吧:)

Give it a try and keep us informed of the result :)

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