嵌套fields_for导轨4

Question

我有问题许可证关于RALS双嵌套fields_for 4.示例关系：

Service - > has_many :product_services 
    accepts_nested_attributes_for :product_services, allow_destroy: true 
    Product Service -> has_many :foto_product_services 
    accepts_nested_attributes_for :foto_product_services, allow_destroy: true 

服务 - > new.html.slim

= form_for @service, :html => {:multipart => true} do |f| 
    = f.fields_for :product_services do |builder| 
    = render 'field_product', f: builder 
= f.submit 

服务 - > _field_product.html .slim

= f.text_field :price, :class => 'text_field input-lg width-100' 
= f.fields_for :foto_product_services do |builder| 
    = builder.file_field "avatar[]", type: :file, multiple: true 

许可证PARAMS在我的服务控制器

def service_params 
    params.require(:service).permit(:service_category_id, :title, :description, :product_services_attributes => [:title, "_destroy"], :foto_product_services_attributes => [:avatar]) 
end 

当我点击按钮提交后选择照片产品，我得到错误未经许可的参数：foto_product_services_attributes。

Answer 1

你有很深的嵌套的属性，所以foto_product_services_attributes应该是product_services_attributes内：

params.require(:service).permit(:service_category_id, :title, :description, :product_services_attributes => [:title, "_destroy", :foto_product_services_attributes => [:avatar]])