Rails4-强参数-嵌套对象-Rails4-StrongParameters-NestedObjects

155  

As odd as it sound when you want to permit nested attributes you do specify the attributes of nested object within an array. In your case it would be

当您希望允许嵌套属性时，您确实指定了数组中嵌套对象的属性，这听起来很奇怪。对你来说是这样的

Update as suggested by @RafaelOliveira

@RafaelOliveira建议更新

params.require(:measurement)
      .permit(:name, :groundtruth => [:type, :coordinates => []])

On the other hand if you want nested of multiple objects then you wrap it inside a hash… like this

另一方面，如果你想要嵌套多个对象，你可以将它封装在一个散列中，就像这样

params.require(:foo).permit(:bar, {:baz => [:x, :y]})

Rails actually have pretty good documentation on this: http://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-permit

Rails实际上在这方面有很好的文档:http://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-permit

For further clarification, you could look at the implementation of permit and strong_parameters itself: https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/metal/strong_parameters.rb#L246-L247

为了进一步说明，您可以查看许可证和strong_parameters本身的实现:https://github.com/rails/rails/rails/blogs/lib/action_controller/metal/strong_parameters.rb# L246-L247。

19  

I found this suggestion useful in my case:

我发现这个建议对我来说很有用:

  def product_params
    params.require(:product).permit(:name).tap do |whitelisted|
      whitelisted[:data] = params[:product][:data]
    end
  end

Check this link of Xavier's comment on github.

查看Xavier对github的评论链接。

This approach whitelists the entire params[:measurement][:groundtruth] object.

这种方法会使整个params[:measurement][:groundtruth]对象变白。

Using the original questions attributes:

使用原始问题属性:

  def product_params
    params.require(:measurement).permit(:name, :groundtruth).tap do |whitelisted|
      whitelisted[:groundtruth] = params[:measurement][:groundtruth]
    end
  end

4  

Permitting a nested object :

允许嵌套对象:

params.permit( {:school => [:id , :name]}, 
               {:student => [:id, 
                            :name, 
                            :address, 
                            :city]},
                {:records => [:marks, :subject]})