管理 Rails ActiveRecord 关联的正确方法是什么？
我是 Rails 新手，所以请耐心等待……
我正在尝试创建一组与 2 个不同模型相关的数据。我目前有以下模型：
class M < ActiveRecord::Base
belongs_to :u
belongs_to :s
end
class U < ActiveRecord::Base
has_many :m
has_many :s, :through => m:
end
class S < ActiveRecord::Base
has_many :m
has_many :u, :through => m;
end
在系统中，用户可以创建许多Us和Ss。但在创建 M 时，应确保存在对“u”和“s”的引用。
我知道我可以执行以下操作：
m1 = M.create()
u1.ms << m1
s1.ms << m1
哪个有所有适当的参考，有更好的方法吗？
I am new to Rails so bear with me…
I am trying to create a set of data related to 2 different models. I currently have the following models:
class M < ActiveRecord::Base
belongs_to :u
belongs_to :s
end
class U < ActiveRecord::Base
has_many :m
has_many :s, :through => m:
end
class S < ActiveRecord::Base
has_many :m
has_many :u, :through => m;
end
In the system, the user can create many Us and Ss. But when creating an M it should make sure that there exist a reference to an "u" and an "s".
I know i can do the following:
m1 = M.create()
u1.ms << m1
s1.ms << m1
Which has all the appropriate reference, is there a better way?
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您应该能够执行
one_u.s = one_s或one_s.u = one_u。根据 Rails 指南，新的
M 模型将由 ActiveRecord 管理。您只需像常见的has_many关联一样设置属性，M行将随之创建（和删除）。You should be able to do either
one_u.s = one_sorone_s.u = one_u.According to the Rails Guides, new
Mmodels will be managed byActiveRecord. You can just set the attribute like a commonhas_manyassociation, and theMrows will be created (and deleted) along with it.