Has_many通过：关联不在Rails 5.2中注册

所以在这个问题上，我有一个has_and_belongs_to_many在people occasions之间使用连接表。

我有它工作（在帮助我的可爱SO向导的帮助下），但说向导建议has_many through: :association可能更适合我的目的。 不幸的是，它确实存在，但在转移过程中我似乎打破了它。

我的schema.rb现在是这样的，使用gifts连接people occasions ：

  create_table "gifts", force: :cascade do |t| t.string "name" t.decimal "price", precision: 8, scale: 2 t.string "store" t.text "notes" t.boolean "purchased", default: false t.integer "user_id" t.integer "person_id", null: false t.integer "occasion_id", null: false t.datetime "created_at", null: false t.datetime "updated_at", null: false t.index ["occasion_id"], name: "index_gifts_on_occasion_id" t.index ["person_id"], name: "index_gifts_on_person_id" t.index ["user_id"], name: "index_gifts_on_user_id" end create_table "occasions", force: :cascade do |t| t.integer "person_id" t.integer "user_id" t.string "name" t.date "date" t.text "notes" t.datetime "created_at", null: false t.datetime "updated_at", null: false t.index ["user_id"], name: "index_occasions_on_user_id" end create_table "people", force: :cascade do |t| t.string "relationship" t.string "first_name" t.string "middle_name" t.string "last_name" t.date "birthday" t.date "anniversary" t.date "other" t.string "other_date_name" t.text "notes" t.integer "user_id" t.datetime "created_at", null: false t.datetime "updated_at", null: false t.string "group" t.integer "occasions_id" t.index ["user_id"], name: "index_people_on_user_id" end 

我相应地更新了模型：

 class Gift < ApplicationRecord # Validations validates_presence_of :person, :occasion, :user # Relations belongs_to :user belongs_to :occasion belongs_to :person end class Occasion < ApplicationRecord # Relations has_many :gifts has_many :people, through: :gifts belongs_to :user end class Person < ApplicationRecord # Relations belongs_to :user has_many :gifts has_many :occasions, through: :gifts def full_name "#{last_name}, #{first_name}" end end 

我的params（我猜）是潜在问题所在：

 def occasion_params params.require(:occasion).permit(:user_id, :name, :date, :notes, gift_ids: []) end 

和

 def person_params params.require(:person).permit(:relationship, :first_name, :middle_name, :last_name, :birthday, :anniversary, :other, :other_date_name, :notes, :group, :user_id, gift_ids: []) end 

这发生在我的occasions#index页面：

  def index @occasions = Occasion.where(user_id: current_user.id).order("date ASC") @occasion = Occasion.new @gifts = Gift.where(user_id: current_user.id) end 

场景occasion#create方法如下所示：

  def create @occasion = Occasion.new(occasion_params) @occasion.user_id = current_user.id respond_to do |format| if @occasion.save format.html { redirect_to occasions_url, notice: 'Occasion was successfully created.' } format.json { render :show, status: :created, location: @occasion } else format.html { render :new } format.json { render json: @occasion.errors, status: :unprocessable_entity } end end end 

最后，当我尝试添加新occasion时，这是服务器日志：

 Started POST "/occasions" for 127.0.0.1 at 2018-10-14 11:03:42 -0700 Processing by OccasionsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"0CaXl8VdEMITUv7/2ouzrF6ArOpe1Wh7QJS3pno8AdAeL834G9rFebfixgsXU7sQ7/HjzGh17yYWhtIGbN18jQ==", "occasion"=>{"name"=>"Here's a Test Occasion", "date"=>"2018-10-31", "notes"=>"", "person_ids"=>["", "22", "24", "25", "26", "27"]}, "commit"=>"Create Occasion"} User Load (4.6ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ /Users/lizbayardelle/.rvm/gems/ruby-2.5.0/gems/activerecord-5.2.1/lib/active_record/log_subscriber.rb:98 Unpermitted parameter: :person_ids (0.2ms) begin transaction ↳ app/controllers/occasions_controller.rb:35 User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ app/controllers/occasions_controller.rb:35 Occasion Create (6.8ms) INSERT INTO "occasions" ("user_id", "name", "date", "notes", "created_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?) [["user_id", 1], ["name", "Here's a Test Occasion"], ["date", "2018-10-31"], ["notes", ""], ["created_at", "2018-10-14 18:03:43.003716"], ["updated_at", "2018-10-14 18:03:43.003716"]] ↳ app/controllers/occasions_controller.rb:35 (2.3ms) commit transaction ↳ app/controllers/occasions_controller.rb:35 Redirected to http://localhost:3000/occasions Completed 302 Found in 131ms (ActiveRecord: 14.2ms) 

任何人都可以关注:association帮助我排除故障吗？

更新的服务器日志

 Started POST "/occasions" for 127.0.0.1 at 2018-10-14 14:33:16 -0700 Processing by OccasionsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"9z9jHd5I9Q+oiRVSxC8T2MpP/X99wcGt8/USh7oEdOc5NjlyAM8gtAw5LaYJ9xtkez6yWUthRvCl53cnrOUJug==", "occasion"=>{"name"=>"Test Occasion", "date"=>"2018-10-01", "notes"=>"", "person_ids"=>["", "22", "24", "25"]}, "commit"=>"Create Occasion"} User Load (3.9ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDER BY "users"."id" ASC LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ /Users/lizbayardelle/.rvm/gems/ruby-2.5.0/gems/activerecord-5.2.1/lib/active_record/log_subscriber.rb:98 Person Load (1.6ms) SELECT "people".* FROM "people" WHERE "people"."id" IN (?, ?, ?) [["id", 22], ["id", 24], ["id", 25]] ↳ app/controllers/occasions_controller.rb:31 (0.2ms) begin transaction ↳ app/controllers/occasions_controller.rb:35 User Load (1.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ app/controllers/occasions_controller.rb:35 CACHE User Load (0.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ app/controllers/occasions_controller.rb:35 CACHE User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ app/controllers/occasions_controller.rb:35 CACHE User Load (0.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]] ↳ app/controllers/occasions_controller.rb:35 (0.1ms) rollback transaction ↳ app/controllers/occasions_controller.rb:35 Completed 422 Unprocessable Entity in 87ms (ActiveRecord: 6.9ms) ActiveRecord::RecordInvalid - Validation failed: Gifts is invalid: app/controllers/occasions_controller.rb:35:in `block in create' app/controllers/occasions_controller.rb:34:in `create' Started POST "/__better_errors/a57498aade504932/variables" for 127.0.0.1 at 2018-10-14 14:33:17 -0700 

Answer 1

未允许的参数:: person_ids

你很亲密！ 您只需要在gift_ids[]更改为person_ids[]

 def occasion_params params.require(:occasion).permit(:user_id, :name, :date, :notes, person_ids: []) end 

此外，在创建Person实例时，您将遇到相同的错误，因为您在person_params中也有gift_ids[] 。 将其更改为occasion_ids[]

 def person_params params.require(:person).permit(:relationship, :first_name, :middle_name, :last_name, :birthday, :anniversary, :other, :other_date_name, :notes, :group, :user_id, occasion_ids: []) end 

更新：

ActiveRecord :: RecordInvalid – validation失败：礼品无效

此错误是由于使用nil user_id创建Gift实例。 您可以向关联添加optional: true以抵消错误为Gift实例添加回调以使用user_id的正确条目创建

 #gift.rb class Gift < ApplicationRecord # Validations validates_presence_of :person, :occasion # Relations belongs_to :user, optional: true belongs_to :occasion belongs_to :person after_create :set_user_id private def set_user_id self.update_column(:user_id, self.occasion.user_id) end end