如何制作可选的强参数键但过滤嵌套参数? [英] How to make an optional strong parameters key but filter nested params?

问题描述

我的控制器中有这个:

params.require(:item).permit!

让我们假设这个 rspec 规范按预期工作:

Let's assume this rspec spec, which works as expected:

put :update, id: @item.id, item: { name: "new name" }

然而，以下原因导致ActionController::ParameterMissing:

put :update, id: @item.id, item: nil

它与我用于其他操作的控制器宏有关，通过它我无法控制正在发送的参数(宏检查用户凭据，所以我并不真正关心实际测试 #update 操作，而我只是为它测试 before_filters).

It has to do with controller macros that I use for other actions and through which I cannot control the params being sent (the macros checks for user credentials, so I don't really care about actually testing an #update action, rather I just test before_filters for it).

所以我的问题是:我如何使 params[:item] 成为可选的，但仍然过滤其中的属性(如果它存在)?

So my question is: How do I make params[:item] optional, yet still filter attributes within it if it's present?

推荐答案

关于:

params.require(:item).permit！if params[:item]

您不能要求可选参数.这是矛盾的.

You cannot require an optional parameter. That is contradictory.

正如 mtjhax 在他的评论中提到的，here 有建议使用fetch 代替:params.fetch(:item, {}).permit!

as mtjhax mentioned in his comment, there is advice from here to use fetch instead: params.fetch(:item, {}).permit!

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