ruby - ActiveModel::MissingAttributeError: 无法写入未知属性 `attendee_id`

Question

我正在尝试在用户模型和出勤模型之间创建关联，其中 attendee_id 引用用户。该关联是用户和音乐会之间的多对多关系。连接表 attendances 有两个字段:attendee 和 :concert。

seed.rb 文件:

require 'faker'

Concert.destroy_all
User.destroy_all
Attendance.destroy_all

15.times do
  Concert.create(band: Faker::RockBand.name, venue: "#{Faker::LordOfTheRings.location}", date: Faker::Date.forward(rand(30)), start_time: "8:00 PM")
end

5.times do |number|
  User.create(first_name: Faker::Name.first_name, last_name: Faker::Name.last_name, email: "#{number}@email.com", password: "password")
end

concerts = Concert.all
users = User.all

15.times do
  Attendance.create(attendee: users.sample, concert: concerts.sample)
end

模型如下:

class Attendance < ApplicationRecord
  belongs_to :attendee, class_name: "User" 
  belongs_to :concert
end
class Concert < ApplicationRecord
  validates :band, :venue, :date, :start_time, presence: true
  has_many :attendances
  has_many :attendees, through: :attendances
end
class User < ApplicationRecord
  validates :first_name, :last_name, :email, presence: true
  validates_format_of :email, with: /@/
  has_secure_password
  has_many :attendances, foreign_key: :attendee_id
  has_many :concerts, through: :attendances
end

这里是迁移:

class CreateAttendances < ActiveRecord::Migration[5.0]
  def change
    create_table :attendances do |t|
      t.references :attendee
      t.references :concert, index: true

      t.timestamps
    end
  end
end

class CreateUsers < ActiveRecord::Migration[5.0]
  def change
    create_table :users do |t|
      t.string :first_name
      t.string :last_name
      t.string :email
      t.string :password_digest

      t.timestamps
    end
  end
end

class CreateConcerts < ActiveRecord::Migration[5.0]
  def change
    create_table :concerts do |t|
      t.string :band
      t.string :venue
      t.datetime :date
      t.time :start_time

      t.timestamps
    end
  end
end

Answer 1

看起来没有 attendee_id 列

bundle exec rails db:reset(与 db:drop + db:create + db:migrate 相同> + db:种子)

对于测试 bundle exec rails db:test:prepare

如果这不能解决问题，我想，我们需要 moar stacktraces)