使用 MongoMapper 进行 MongoDB 设计中的多对多与一对多

Question

有一个这样的例子：

class Book
  include MongoMapper::Document
  key :title
  key :author_ids, Array
  many :authors, :in => :author_ids
end

class Author
  include MongoMapper::Document
  key :name
end

它相当于

class Book
  include MongoMapper::Document
  key :title
  many :AuthorHasBook
end

class AuthorHasBook
  include MongoMapper::Document
  key :written_time

  belongs_to :book, :class_name => "Book"
  belongs_to :author, :class_name => "Author"
end

class Author
  include MongoMapper::Document
  key :name
  many :AuthorHasBook
end

Which is better吗？我想如果我需要为“关系”实体添加一些字段，我必须使用第二个解决方案？

提前致谢！

Answer 1

您必须使用

many :author_has_books

MongoMapper 才能获取您的类名并将其关联起来。不确定它是否会以其他方式工作。

唯一的区别是您可以反转多对多关联。