在Rails中建立多个多对多关系的最佳方法是什么？

Question

I am fairly new to RoR - so please be gentle :)

i am trying to setup an environment that has two many to many relationships.

What I am thinking is:

class A
  has_many :c
  has_many :d
  has_many :b, :through=>c
  has_many :b, :through=>d
end

class B
  has_many :c
  has_many :d
  has_many :a, :through=>c
  has_many :a, :through=>d
end

class C
  belongs_top :a
  belongs_to :b
end

class D
  belongs_top :a
  belongs_to :b
end

From all this I have read multiple :through associations to the one attribute in the one class will not work. And the whole purpose of this setup is so I can easily call data with reference to both c and d - ie @ac and @ad, as well as @bc and @bd

Any thoughts?

Thanks in advance.

Damo

Answer 1

You can have multiple has_many :through associations, but you just need to give them different names:

class A
  has_many :c
  has_many :d
  has_many :cb, :through=>c, :class_name => "B"
  has_many :db, :through=>d, :class_name => "B
end