用蹭嵌套多个模型

Question

我正在尝试创建嵌套表单，它将为两个关联的模型组合 2 个属性。

假设我有 3 个模型：配方（主模型）、配方成分（配方和成分的连接模型）和成分。

代码如下：

class Recipe < ApplicationRecord
    has_many :directions, inverse_of: :recipe
    has_many :recipe_ingredients, inverse_of: :recipe
    has_many :ingredients, through: :recipe_ingredients
    accepts_nested_attributes_for :ingredients,
                                    reject_if: proc { |attributes| attributes['name'].blank? },
                                    allow_destroy: true
    accepts_nested_attributes_for :directions,
                                    reject_if: proc { |attributes| attributes['step'].blank? },
                                    allow_destroy: true
    accepts_nested_attributes_for :recipe_ingredients,
                                    reject_if: proc { |attributes| attributes['quantity'].blank? },
                                    allow_destroy: true

    validates :tittle, :description, :image, presence: true
    has_attached_file :image, styles: { :medium => "400x400#" }
    validates_attachment_content_type :image, content_type: /Aimage/.*Z/
end
class Ingredient < ApplicationRecord
    has_many :recipe_ingredient, inverse_of: :ingredient
    has_many :recipes, through: :recipe_ingredient
end
class RecipeIngredient < ApplicationRecord
  belongs_to :recipe
  belongs_to :ingredient, inverse_of: :recipe_ingredient
end

我的嵌套：

.col-md-6
                %h3 Skladniki
                #ingredients
                    = f.simple_fields_for :recipe_ingredients do |recipe_ingredient|
                        =render 'recipe_ingredient_fields', f: recipe_ingredient
                    .links
                        = link_to_add_association 'Dodaj skladnik', f, :recipe_ingredients, class: "btn btn-default add-button", :wrap_object => Proc.new {|recipe_ingredient| recipe_ingredient.build_ingredient; recipe_ingredient }

在这里你可以看到我正在尝试访问两个属性：1. 数量（类配方成分） - 这部分还可以2.名称（类成分）-这部分完全是KO

.form-inline.clearfix
        .nested-fields
            = f.input :quantity, :label => "Ilość", input_html: { class: "form-input form-control" }
            = f.fields_for :ingredients_attributes do |ingr|
                = ingr.input :name, :label => "Nazwa", input_html: { class: "form-input form-control" }
            = link_to_remove_association "Usun", f, class: "form-button btn btn-default"

在验证过程中，我收到此错误

食谱成分成分必须存在

原因如下：

Parameters: {"utf8"=>"✓", "authenticity_token"=>"nw14a3HkgSrjE+QpIK4POEzTOqBhtE/EMe+CarWkmI6CSRf0GAdWZGzJQRD4aPurNDNm96TJbt60mc1hl+1JPA==", "recipe"=>{"tittle"=>"Tosty", "description"=>"Testowy przepis", "preparation_time"=>"10.0", "portion"=>"2", "recipe_ingredients_attributes"=>{"1507996685991"=>{"quantity"=>"432", "ingredients_attributes"=>{"name"=>"fasdd"}, "_destroy"=>"false"}, "1507996689888"=>{"quantity"=>"2134432342", "ingredients_attributes"=>{"name"=>"dsad"}, "_destroy"=>"false"}}, "directions_attributes"=>{"0"=>{"step"=>"Krok1", "_destroy"=>"false", "id"=>"1"}, "1"=>{"step"=>"Krok2", "_destroy"=>"false", "id"=>"2"}}}, "commit"=>"Update Recipe", "id"=>"5"}
  Recipe Load (0.3ms)  SELECT  "recipes".* FROM "recipes" WHERE "recipes"."id" = ? LIMIT ?  [["id", 5], ["LIMIT", 1]]
Unpermitted parameter: ingredients_attributes
Unpermitted parameter: ingredients_attributes
   (0.2ms)  begin transaction
  Direction Load (0.3ms)  SELECT "directions".* FROM "directions" WHERE "directions"."recipe_id" = ? AND "directions"."id" IN (1, 2)  [["recipe_id", 5]]
   (0.2ms)  rollback transaction

传递给方法的参数与recipe_params的定义不匹配（recipe_controller 中的私有方法）：

def recipe_params
        params.require(:recipe).permit(:tittle, :description, :image, :portion, :preparation_time, ingredients_attributes: [:id, :name, :_destroy], directions_attributes: [:id, :step, :_destroy], recipe_ingredients_attributes: [:id, :quantity, :_destroy])
    end

关键是...如何解决？所以ingredients_attributes会从recipe_ingredients_attributes传出去？

Answer 1

日志文件

中的错误指出不允许使用 ingredients_attributes 参数。如果检查传递的参数，您可以看到recipe_ingredients_attributes包含ingredients_attributes，而强参数定义（recipe_params方法）不允许这样做：它还必须支持正确的嵌套。

Answer 2

感谢内森。

答案可以在这里枯燥地找到（cocoon git）：https://github.com/nathanvda/cocoon/issues/461