On Mon, Mar 1, 2010 at 12:29 PM, Ichiro Saga <[email protected]> wrote:

> Hi, guys.
> There are four models in the program, A has_many B through C, B has_many
> A through C, A has_many D, D belongs_to A.  I have a form to create A.
> Inspired by Ryan Bates' railscasts I was able to create A and D in the
> same form, and link A to B(created beforehand) through C in the same
> form as well.  Is it possible to create A and B in the same form?
> Thanks in advance.
>

Ichiro, it might have been better to provide the sample code as follows:

class A <  AR
   has_many :B, :through => :C
   has_many :D
end

class B < AR
  has_many :A, :through => :C
end

class D < AR
   belongs_to :A
end

Next, you should be able to create A and B in the same form using
accepts_nested_attributes_for.  For example,

class A <  AR
   has_many :B, :through => :C
   has_many :D
   accepts_nested_attributes_for :B
end

Note:  You'll need to create the appropriate form as Ryan Bates walks
you through in his nested model form screencasts.

Good luck,

-Conrad

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