Rails 4 允许使用动态键的嵌套散列

Question

在允许参数中包含动态键的嵌套哈希时遇到问题。我已经提到了关于堆栈溢出的其他类似问题，但到目前为止还没有运气。任何帮助是极大的赞赏。以下是引发的错误。

ActionController::UnpermittedParameters 发现不允许的参数：volunteers_slots_attributes、sign_up_slots_attributes

{"event"=>{
"name"=>"ss", 
"volunteers_slots_attributes"=>{
"0"=>{"_destroy"=>"false", "needed_count"=>""},
"1"=>{"_destroy"=>"false", "needed_count"=>""},
... 
}, 
"sign_up_slots_attributes"=>{
"0"=>{"_destroy"=>"false", "title"=>"", "quantity"=>""}, 
"1"=>{"_destroy"=>"false", "title"=>"", "quantity"=>""}, 
"2"=>{"_destroy"=>"false", "title"=>"", "quantity"=>""},
 .... 
}, 
"supplies_note"=>""}}

控制器：

 def event_params
    params[:event].permit(:name,:supplies_note,
    :volunteers_slots_attributes,
    :sign_up_slots_attributes)
 end

事件模型：

  accepts_nested_attributes_for :sign_up_slots, allow_destroy: true, reject_if: :all_blank
  accepts_nested_attributes_for :volunteers_slots, allow_destroy: true, reject_if: :all_blank

Answer 1

您需要确保 event.rb 模型文件接受嵌套属性。

在您的情况下，它应该包含如下几行：

accepts_nested_attributes_for :volunteers_slots, reject_if: :all_blank, allow_destroy: true
accepts_nested_attributes_for :sign_up_slots, reject_if: :all_blank, allow_destroy: true
# ...

Answer 2

您总是可以使用 params[:event].permit(:name: volunteers_slots_attributes: ['0', '1']) 之类的东西来允许嵌套属性。

Answer 3

你必须像

一样改变你的强参数

params.require(:event).permit( :name, :supplies_note, volunteers_slots_attributes: [ :_destroy, :needed_count ], sign_up_slots_attributes: [ :_destroy, :title, :quantity ] )

Rails 4 允许使用动态键的嵌套散列

Rails 4 permit nested hash with dynamic keys

ruby-on-rails-4