Question

我似乎在rails 4应用程序中将我的关联错误连接起来。这基本上是我的设置（虽然有点做作）

型号：

book.rb

class Book < ActiveRecord::Base
  has_many :books_and_users
  has_many :users, through: :books_and_users
  validates :user_id, presence: true
end

user.rb

class User < ActiveRecord::Base
  has_many :books_and_users
  has_many :books, through: :books_and_users
  validates :name, presence: true
end

book_and_user.rb

class BooksAndUser < ActiveRecord::Base
  self.table_name = "books_and_users"
  belongs_to :book
  belongs_to :user
  validates :user, presence: true
  validates :book, presence: true
end

模式

create_table "books", force: true do |t|
  t.string   "name"
  t.datetime "created_at"
  t.datetime "updated_at"
  t.integer  "user_id"
end

add_index "books", ["user_id"], name: "index_books_on_user_id"

create_table "books_and_users", force: true do |t|
  t.integer "user_id"
  t.integer "book_id"
end

add_index "books_and_users", ["book_id"], name: "index_books_and_users_on_book_id"
add_index "books_and_users", ["user_id"], name: "index_books_and_users_on_user_id"

create_table "users", force: true do |t|
  t.string   "email",                  default: "", null: false
  t.datetime "created_at"
  t.datetime "updated_at"
  t.string   "name"
end

当我想检查在rails控制台中正确设置的模型时，我会执行以下操作：

u = User.first
u.books => NameError: uninitialized constant User::BooksAndUser

我做错了什么？

Answer 1

将book_and_user.rb重命名为books_and_user.rb

NameError：未初始化的常量User :: BooksAndUser in has_many：通过关联

1 个答案: