Rails 5 has many through associations — почему возникает ошибка Could not find table 'team_users'?

Question

[Diesel-nick]

Когда я создаю миграцию новой функцией в Rails 5 - create_join_table, и делаю ассоциацию has many through для двух таблиц users и teams, почему-то возникает ошибка Could not find table 'team_users'

Migration

rails g migration CreateJoinTableTeamUser team user

20161011185253_create_join_table_team_user.rb

class CreateJoinTableTeamUser < ActiveRecord::Migration[5.0]
  def change
    create_join_table :teams, :users do |t|
      t.index [:team_id, :user_id]
      t.index [:user_id, :team_id]
    end
  end
end

team.rb

class Team < ApplicationRecord
  has_many :team_user
  has_many :users, through: :team_user
end

user.rb

class User < ApplicationRecord
  has_many :team_user
  has_many :teams, through: :team_user
end

team_user.rb

class TeamUser < ApplicationRecord
  include Userstampable::Stampable

  belongs_to :user
  belongs_to :team

  # validates :user_id, presence: true
  # validates :team_id, presence: true
end

Terminal - ошибка

2.3.1 :001 > team = Team.first
...
2.3.1 :002 > me = User.first
...
2.3.1 :003 > team.users << me
...
ActiveRecord::StatementInvalid: Could not find table 'team_users'

Answer 1

[Илья Лебедев]

У тебя вот так:

class CreateJoinTableTeamUser < ActiveRecord::Migration[5.0]
  def change
    create_join_table :teams, :users do |t|
      t.index [:team_id, :user_id]
      t.index [:user_id, :team_id]
    end
  end
end

А надо:

class CreateTeamUser < ActiveRecord::Migration[5.0]
  def change
    create_table :team_users do |t|
      t.integer team_id
      t.integer user_id
    end
  end
end

Соответственно команда:

rails g migration CreateTeamUsers team_id:integer user_id:integer