ruby-on-rails - Rails 5 params 对象具有空数组作为值被删除

Question

发送如下所示的 Controller 参数时遇到问题:

{ id: "1", stuff: {"A" => [], "B" => [], "C" => [], "D" => []} }

方法只看到 { id: "1" }和整个 stuff参数被删除。

如果数组中有任何值，则可以更改此设置。但是假设所有数组中都有值，除了键 "C" ，除了 "C"，他们都会在那里喜欢:

{ id: "1", stuff: {"A" => ["1"], "B" => ["2", "3"], "D" => ["4"]} }

我在从 Rails 4.2.x -> 5.0.0 升级时遇到了这个问题
关于这里发生的事情的任何建议？我在 munging parameters 周围看到了一些文章/问题，但我不确定这是否是问题所在，因为在他们关于 munging 工作原理的示例表中是 {person: []}变成 {person: nil} ，其中 person 参数没有完全删除。

Answer 1

来自 GH 社区的@sgrif:

This is the expected behavior. There is no way to encode an empty array using an HTML form (e.g. Content-Type: url-form-encoded). The reason your tests passed in Rails 4.2 is because controller tests did not encode their parameters, they simply passed the hash through directly. In Rails 5 it encodes them. If your controller cares about empty arrays, it's likely that you are dealing with JSON requests. You can do that in your test with as: :json. If you're just dealing with form input, you will never receive an empty array.

添加 as: :json最终没有为我工作，但添加 @request.headers["Content-Type"] = 'application/json'在测试开始时确实如此。