rails3 has_​​and_belongs_to_many定制 [英] rails3 has_and_belongs_to_many customization

问题描述

图书 has_​​and_belongs_to_many 学生
学生 has_​​and_belongs_to_many 图书

Book has_and_belongs_to_many Students
Student has_and_belongs_to_many Books

在BooksStudents模式，我想添加状态字段来存储如果是租来的，买了..等。并能够选择例如 @ student.books.rented 或 @ student.books.where（：books_students =＆GT; {：状态=＆GT ; 2}）

In BooksStudents model I want to add "status" field to store if it is rented, bought ..etc. and be able to select for example @student.books.rented or @student.books.where(:books_students=>{:status=>2})

我可以做到这一点HABTM？

Can I do that with HABTM?

推荐答案

AFAIK没有，您将需要一个的has_many：通过设置..

AFAIK no, you will need a has_many :through setup..

class Book < ActiveRecord::Base
  has_many :books_students  
  has_many :students, :through => :books_students
end

class BooksStudent  < ActiveRecord::Base
  belongs_to :book  
  belongs_to :student 
end 

classStudent  < ActiveRecord::Base 
  has_many :books_students  
  has_many :books, :through => :books_students  
end

这样你就可以这样做 @ student.books 或 @ student.student_books.where（：状态=＆GT; 2）

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