Rails将空数组转换为请求参数中的nil [英] Rails converts empty arrays into nils in params of the request

问题描述

我的应用程序中有一个Backbone模型，它不是典型的平面对象，它是一个很大的嵌套对象，我们将嵌套部分存储在MySQL数据库的TEXT列中.

I have a Backbone model in my app which is not a typical flat object, it's a large nested object and we store the nested parts in TEXT columns in a MySQL database.

我想在Rails API中处理JSON编码/解码，以便从外部看来，即使部分存储为字符串化JSON文本，您也可以POST/GET这个大嵌套的JSON对象.

I wanted to handle the JSON encoding/decoding in Rails API so that from outside it looks like you can POST/GET this one large nested JSON object even if parts of it are stored as stringified JSON text.

但是，我遇到了一个问题，其中Rails神奇地将空数组转换为nil值.例如，如果我发布此信息:

However, I ran into an issue where Rails magically converts empty arrays to nil values. For example, if I POST this:

{
  name: "foo",
  surname: "bar",
  nested_json: {
    complicated: []
  }
}

我的Rails控制器看到以下内容:

My Rails controller sees this:

{
  :name => "foo",
  :surname => "bar",
  :nested_json => {
    :complicated => nil
  }
}

所以我的JSON数据已被更改..

And so my JSON data has been altered..

以前有人遇到过这个问题吗?为什么Rails会修改我的POST数据?

Has anyone run into this issue before? Why would Rails be modifying my POST data?

更新

他们在这里做这件事:

https://github.com/rails/rails /blob/master/actionpack/lib/action_dispatch/http/request.rb#L288

这是〜他们这样做的原因:

And here is ~why they do it:

https://github.com/rails/rails/pull/8862

所以现在的问题是，如何在嵌套的JSON API情况下最好地解决这个问题?

So now the question is, how to best deal with this in my nested JSON API situation?

推荐答案

经过大量搜索，我发现您从Rails 4.1开始，可以完全使用以下方法跳过deep_munge功能"

After much searching, I discovered that you starting in Rails 4.1 you can skip the deep_munge "feature" completely using

config.action_dispatch.perform_deep_munge = false

我找不到任何文档，但是您可以在这里查看此选项的介绍: https://github.com/rails/rails/commit/e8572cf2f94872d81e7145da31d55c6e1b074247

I could not find any documentation, but you can view the introduction of this option here: https://github.com/rails/rails/commit/e8572cf2f94872d81e7145da31d55c6e1b074247

这样做有可能的安全风险，请在此处记录: https://groups. google.com/forum/#!topic/rubyonrails-security/t1WFuuQyavI

There is a possible security risk in doing so, documented here: https://groups.google.com/forum/#!topic/rubyonrails-security/t1WFuuQyavI

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