Ruby on rails 如何在Rails中使用has\u和\u-belish\u-to\u-many保存额外字段

我的rails应用程序具有以下结构：

class Movie < ActiveRecord::Base
  has_and_belongs_to_many :celebs, :join_table => "movies_celebs"
end
class Celeb < ActiveRecord::Base
  has_and_belongs_to_many :movies, :join_table => "movies_celebs"
end
class MovieCeleb < ActiveRecord::Base
  belong_to :movie
  belong_to :celeb
end

class电影“电影\u名人”
结束
类Celeb“电影\u名人”
结束
类MovieCeleb

现在MovieCeleb有两个额外的字段CastName（string）、CastType（'Actor/Director）。当我保存电影时，我也会创建名人，并将名人填入名人关系，它会自动将电影和名人保存到数据库中。但是我如何传递CastName和CastType来保存呢

请告知

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提前感谢。

如果您需要验证、回调或连接模型上的额外属性，您应该使用has\u many:through而不是has\u和\u-belies\u-to\u many

见：

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注意，以下内容适用于Rails v2

    script/generate model Movie id:primary_key name:string
    script/generate model Actor id:primary_key movie_id:integer celeb_id:integer cast_name:string cast_type:string
    script/generate model Celeb id:primary_key name:string

model/movie.rb 
    class Movie < ActiveRecord::Base
      has_many :actors
      has_many :celebs, :through => :actors
    end

model/celeb.rb
    class Celeb < ActiveRecord::Base
      has_many :actors
      has_many :movies, :through => :actors
    end

model/actor.rb
    class Actor < ActiveRecord::Base
      belongs_to :movie
      belongs_to :celeb
    end

然后你可能会想看看Ryan Bates的Railcast#47（两个多对多）和#73、#74、#75（复杂形式第1-3部分）

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在#75的网页上有一个多对多表单代码的更新版本。

我正在学习ruby on rails。你能给出一个示例代码吗？使用has_many:through保存数据的最佳方法是什么？单击链接并查看示例。如果你使用has_多：通过代替h_a_b_t_m，你得到两个关系，而不是一个，与电影名人的关系和与电影名人的关系。因此，您可以在movie_celeb关系模型中读取/写入属性。

>script/console
>m = Movie.new
>m.name = "Do Androids Dream Of Electric Sheep"
>m.methods.sort    #this will list the available methods

#Look for the methods 'actors' and 'celebs' - these                 
#are the accessor methods built from the provided models

>m.actors          #lists the actors - this will be empty atm
>c = Celeb.new
>c.name = "Harrison Ford"
>m.celebs.push(c)  #push Harrison Ford into the celebs for Blade Runner
>m.actors          #Will be empty atm because the movie hasnt been saved yet
>m.save            #should now save the Movie, Actor and Celeb rows to relevant tables
>m.actors          #Will now contain the association for

#Movie(id : 1, name : "Do Androids..") - Actor(id : 1, movie_id : 1, celeb_id : 1) -
#Celeb(id : 1, name : "Harrision Ford")

>m = Movie.new     #make a new movie
>m.name = "Star Wars"
>m.celebs.push(c)  #associated the existing celeb with it
>m.save
>movies = Movie.all   #should have the two movies saved now
>actors = Actor.all   #should have 2 associations
>this_actor = Actor.first
>this_actor.cast_type = "ACTOR"
>this_actor.save