三重嵌套形式Rails 5.1上的不允许参数

Question

我有一个用于以下模型的三重嵌套表单。

roasts、countries、regions

我可以创造一种新的烤肉，它也创造了国家，但不能创造地区。控制台输出：

  Parameters: {"utf8"=>"✓", "authenticity_token"=>"cR5jRFbaslQU5+nWiU8rBWlC9OQ0E9zgMwY1YCF33Z1cwPkmJvsO5GKQ4hTNIB4Mku3EuL19WJTrg4e03gHW4Q==", "roast"=>{"roaster"=>"Square Mile", "name"=>"Red Brick", "countries_attributes"=>{"0"=>{"country_name"=>"UK"}}, "regions"=>{"region_name"=>"Midlands"}, "bestfor"=>"", "roast"=>"", "tastingnotes"=>""}, "commit"=>"Create Roast"}
  User Load (0.7ms)  SELECT  "users".* FROM "users" WHERE "users"."user_id" = $1 ORDER BY "users"."user_id" ASC LIMIT $2  [["user_id", 15], ["LIMIT", 1]]
Unpermitted parameter: :regions

我注意到，对于countries，日志有“countries_attributes”，但regions 只是“regions”，而这也应该是 region_attributes。我将国家控制器中的区域参数嵌套在国家参数中。那是对的吗？我试过它们没有嵌套，这也不起作用：

我的参数：

def roast_params
  params.require(:roast).permit(:roaster, :name, :bestfor, :beans, :roast, :tastingnotes, :notes, :slug, :avatar, countries_attributes: [:country_id, :country_name, regions_attributes: [:id, :region_name]])
end

将其更改为 regions_attributes: [:region_id, :region_name] 没有帮助。

roast.rb

class Roast < ApplicationRecord
  has_many :tastings
  has_many :countries
  has_many :notes, through: :tastings
  has_many :comments, as: :commentable
  accepts_nested_attributes_for :countries

country.rb

class Country < ApplicationRecord
  has_many :regions, inverse_of: :country
  accepts_nested_attributes_for :regions
  belongs_to :roasts

region.rb

class Region < ApplicationRecord
  belongs_to :country, inverse_of: :regions

烘烤控制器

  def new
    @roast = Roast.new
    @roast.countries.build.regions.build
  end

嵌套字段的表单

  <div class="form-group">
    <%= form.fields_for :countries do |countries_form| %>
      <%= countries_form.label :country %>
      <%= countries_form.text_field :country_name, class: "form-control" %>
<br />
      <%= form.fields_for :regions do |regions_form| %>
        <%= regions_form.label :region %>
        <%= regions_form.text_field :region_name, class: "form-control" %>
      <% end %>
    <% end %>
  </div>

Answer 1

我认为

<%= form.fields_for :regions do |regions_form| %>
    <%= regions_form.label :region %>
    <%= regions_form.text_field :region_name, class: "form-control" %>
<% end %>

应该是

<%= countries_form.fields_for :regions do |regions_form| %>
    <%= regions_form.label :region %>
    <%= regions_form.text_field :region_name, class: "form-control" %>
<% end %>