ruby-on-rails – Rails 4强参数,包含多个对象和整数键

我一次提交一个包含2-4个对象的表单,具体取决于父项的数量.我意识到这可能是非常规的,但我真的希望用户能够在一个表单上一次编辑所有对象.在我的表格上,我正在做：

<%= simple_fields_for "derps[]",derp do |f| %>

<% end %>

然后我在控制器中这样做：

def update
  @derps = []
  @rejects = []
  derps_params.each do |key,hash|
    derp = Derp.find(key)
    derp.assign_attributes(hash)
    @rejects << derp unless derp.save
  end
  if @rejects.empty?
    redirect_to @parent,flash: {success: 'Derps were successfully updated.'}
  else
    @derps = @rejects
    render :edit
  end
end

让我们说有两个对象 – 参数通过：

"derps"=>{"1"=>{"attribute"=>"39","another_attribute"=>"serp","a_third_attribute"=>"yerp"},"2"=>{"attribute"=>"30","another_attribute"=>"49",}}

我在Rails 3中工作时没有强大的参数.我正在升级到rails 4,我正在努力解决这个问题 – 我不断得到“未经许可的参数：1,2”

我假设我需要做以下事情：

def mashes_params
  params.require(:derps).permit(
  id: []

要么

def mashes_params
  params.require(:derps).permit(
  :id,

沿着这条路线的东西,但我已经尝试过每一个我能想到没有运气的方式.

这里有什么想法？

rails c # From within your project directory,short for 'rails console'

params = ActionController::Parameters.new( { derps: { 1 => { attribute: 39,another_attribute: "serp" },2 => { attribute: 30,another_attribute: 49 }  } } )

params # To make sure that the object looks the same

permitted = params.require( :derps ).permit( 1 => [ :attribute,:another_attribute ],2 => [ :attribute,:another_attribute ] )

permitted # To see what you'd get BACk in your controller