我正在尝试创建一个依赖于多态关系的非常复杂的嵌套形式。我已经完成了大部分工作，但是这一关系不会像我期望的那样执行删除操作。
Recipe有很多RecipeSteps，
RecipeSteps可以是与以下三项之一相关的多态：Techniques，Steps或Recipes
出于某种原因，当我尝试通过嵌套形式从RecipeStep删除recipes#edit并将_delete: 1传递到RecipeStep时，rails拒绝删除belongs_to。响应在下面的代码块的底部列出。
我尝试将与RecipeStep关联的requires: false更改为dependent: destroy，并尝试在会导致FK错误的任何内容上添加recipes_controller.rb。并且我尝试更新:_delete Strong Params以允许所有这些信息通过。我包括:id，RecipeStep和# frozen_string_literal: true
# Adds the polymorphic relation to recipes through recipe_steps
module Stepable
extend ActiveSupport::Concern
included do
has_many :recipe_steps, as: :stepable
has_many :recipes, through: :recipe_steps
end
end
要求的所有其他参数。
我没有收到任何错误，甚至都没有尝试删除。
我正在使用这些宝石：
以下是相关代码：
# frozen_string_literal: true
# == Schema Information
#
# Table name: recipes
#
# id :bigint(8) not null, primary key
# title :string
# description :text
# created_at :datetime not null
# updated_at :datetime not null
#
# Recipe's are containers that can have as many Steps, Techniques, or even
# other Recipes within them.
class Recipe < ApplicationRecord
include Stepable
has_many :recipe_steps
has_many :steps,
through: :recipe_steps,
source: 'stepable',
source_type: 'Step',
dependent: :destroy
has_many :techniques,
through: :recipe_steps,
source: 'stepable',
source_type: 'Technique',
dependent: :destroy
has_many :recipes,
through: :recipe_steps,
source: 'stepable',
source_type: 'Recipe',
dependent: :destroy
has_many :ingredients,
through: :steps
has_many :step_ingredients,
through: :steps,
dependent: :destroy
accepts_nested_attributes_for :recipes,
reject_if: :all_blank,
allow_destroy: true
accepts_nested_attributes_for :techniques,
reject_if: :all_blank,
allow_destroy: true
accepts_nested_attributes_for :steps,
reject_if: :all_blank,
allow_destroy: true
accepts_nested_attributes_for :recipe_steps,
reject_if: :all_blank,
allow_destroy: true
end
# frozen_string_literal: true
class RecipesController < ApplicationController
before_action :set_recipe, only: [:show, :edit, :update, :destroy]
# GET /recipes
# GET /recipes.json
def index
@recipes = Recipe.all.decorate
end
# GET /recipes/1
# GET /recipes/1.json
def show
end
# GET /recipes/new
def new
@recipe = Recipe.new
end
# GET /recipes/1/edit
def edit
end
# POST /recipes
# POST /recipes.json
def create
@recipe = Recipe.new(recipe_params)
respond_to do |format|
if @recipe.save
format.html { redirect_to @recipe, notice: 'Recipe was successfully created.' }
format.json { render :show, status: :created, location: @recipe }
else
format.html { render :new }
format.json { render json: @recipe.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /recipes/1
# PATCH/PUT /recipes/1.json
def update
respond_to do |format|
if @recipe.update(recipe_params)
format.html { redirect_to @recipe, notice: 'Recipe was successfully updated.' }
format.json { render :show, status: :ok, location: @recipe }
else
format.html { render :edit }
format.json { render json: @recipe.errors, status: :unprocessable_entity }
end
end
end
# DELETE /recipes/1
# DELETE /recipes/1.json
def destroy
@recipe.destroy
respond_to do |format|
format.html { redirect_to recipes_url, notice: 'Recipe was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_recipe
@recipe = Recipe.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def recipe_params
params.require(:recipe)
.permit(
:name,
:title,
:description,
recipe_steps_attributes: [
:id,
:position,
:stepable_type,
:stepable_id,
:recipe_id,
:_destroy
],
recipes_attributes: [
:id,
:_destroy
],
techniques_attributes: [
:id,
:title,
:description,
:_destroy
],
steps_attributes: [
:id,
:title,
:description,
:_destroy,
step_ingredients_attributes: [
:id,
:_destroy,
:ingredient_id,
measurements_attributes: [
:id,
:unit,
:scalar,
:purpose,
:_destroy
],
ingredient_attributes: [
:id,
:title,
:description,
:_destroy
]
]
]
)
end
end
# frozen_string_literal: true
# == Schema Information
#
# Table name: recipe_steps
#
# id :bigint(8) not null, primary key
# recipe_id :bigint(8)
# stepable_type :string
# stepable_id :bigint(8)
# position :integer
# created_at :datetime not null
# updated_at :datetime not null
#
# RecipeStep is the through table for relating polymorphic stepable items to
# the recipe.
class RecipeStep < ApplicationRecord
belongs_to :stepable, polymorphic: true, required: false
belongs_to :recipe, required: false
before_create :set_position
accepts_nested_attributes_for :stepable,
reject_if: :all_blank,
allow_destroy: true
default_scope -> { order(position: :asc) }
private
def set_position
self.position = recipe.recipe_steps.count + 1
end
end
Started PATCH "/recipes/3" for ::1 at 2019-02-19 15:55:20 -0500
Processing by RecipesController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"21JWhw/o6ysiInTGv4gJp8pTrvh5jpscpGw2Fhm2o3OyitieRz26nBGeFaZclH21zXHBhjtF7L9ujE3yILl+IQ==", "recipe"=>{"title"=>"Pizza", "description"=>"Three eggs with cilantro, tomatoes, onions, avocados and melted Emmental cheese. With a side of roasted potatoes, and your choice of toast or croissant.", "recipe_steps_attributes"=>{"0"=>{"position"=>"2", "_destroy"=>"1", "id"=>"11"}, "1"=>{"position"=>"10", "_destroy"=>"false", "id"=>"10"}}, "steps_attributes"=>{"0"=>{"title"=>"Ricotta Stuffed Ravioli", "description"=>"Two butter croissants of your choice (plain, almond or cheese). With a side of herb butter or house-made hazelnut spread.", "step_ingredients_attributes"=>{"0"=>{"ingredient_id"=>"1", "measurements_attributes"=>{"0"=>{"unit"=>"", "scalar"=>"0.7", "_destroy"=>"false", "id"=>"15"}, "1"=>{"unit"=>"", "scalar"=>"6.7", "_destroy"=>"false", "id"=>"16"}, "2"=>{"unit"=>"", "scalar"=>"5.8", "_destroy"=>"false", "id"=>"17"}}, "_destroy"=>"false", "id"=>"11"}}, "id"=>"10"}}}, "commit"=>"Save", "id"=>"3"}
Recipe Load (0.3ms) SELECT "recipes".* FROM "recipes" WHERE "recipes"."id" = $1 LIMIT $2 [["id", 3], ["LIMIT", 1]]
↳ app/controllers/recipes_controller.rb:69
(0.2ms) BEGIN
↳ app/controllers/recipes_controller.rb:46
RecipeStep Load (0.8ms) SELECT "recipe_steps".* FROM "recipe_steps" WHERE "recipe_steps"."recipe_id" = $1 AND "recipe_steps"."id" IN ($2, $3) ORDER BY "recipe_steps"."position" ASC [["recipe_id", 3], ["id", 11], ["id", 10]]
↳ app/controllers/recipes_controller.rb:46
Step Load (1.0ms) SELECT "steps".* FROM "steps" INNER JOIN "recipe_steps" ON "steps"."id" = "recipe_steps"."stepable_id" WHERE "recipe_steps"."recipe_id" = $1 AND "recipe_steps"."stepable_type" = $2 AND "steps"."id" = $3 ORDER BY "recipe_steps"."position" ASC [["recipe_id", 3], ["stepable_type", "Step"], ["id", 10]]
↳ app/controllers/recipes_controller.rb:46
StepIngredient Load (0.4ms) SELECT "step_ingredients".* FROM "step_ingredients" WHERE "step_ingredients"."step_id" = $1 AND "step_ingredients"."id" = $2 [["step_id", 10], ["id", 11]]
↳ app/controllers/recipes_controller.rb:46
Measurement Load (0.4ms) SELECT "measurements".* FROM "measurements" WHERE "measurements"."step_ingredient_id" = $1 AND "measurements"."id" IN ($2, $3, $4) [["step_ingredient_id", 11], ["id", 15], ["id", 16], ["id", 17]]
↳ app/controllers/recipes_controller.rb:46
(0.2ms) COMMIT
↳ app/controllers/recipes_controller.rb:46
Redirected to http://localhost:3100/recipes/3
Completed 302 Found in 21ms (ActiveRecord: 3.3ms)
Started GET "/recipes/3" for ::1 at 2019-02-19 15:55:21 -0500
Processing by RecipesController#show as HTML
"recipe_steps_attributes"=>{"0"=>{"position"=>"2", "_destroy"=>"1", "id"=>"11"}重要信息：_destroy
如您所见，recipe_step参数已正确设置，并且不会发送任何不允许的参数错误。但是，甚至没有尝试删除simple form
我没有包含此错误的视图，因为我认为它们运行正常，这可以通过将参数传递给控制器来看出。如果您认为我的cocoon和/或let arr = [{name: 'jack', age: 29}, {name: 'jill', age: 30}]
arr = arr.map(({name}) => ({...{}, name}))
实现可能有错误，请询问，我将添加这些代码段。
答案 0 :(得分：1)
问题在于Recipe与RecipeStep有两种联系：
has_many :recipe_steps has_many :recipe_steps, as: :stepable通过stepable.rb关注事项使这两个都为:recipe_steps是问题所在。我将关注点更改为：
has_many :through_steps, as: :stepable, class_name: 'RecipeStep'，这解决了删除问题。