Rails - Mar 2010 - has_many models in a form

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.
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On Mon, Mar 1, 2010 at 12:29 PM, Ichiro Saga
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> 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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Thank you for your help, Conrad.  I''ll try it out later.
You are right, I should''ve provided the sample code.  It''s
cleaner and
more clear.
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Conrad Taylor wrote:
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
> 
> --
I don''t know if I need to write a new post, but the issue is related to
the topic.  I did what Conrad suggested and it worked perfectly.  But 
there''s a problem on deleting B on the edit page of A.  Here''s
the A.rb:

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

When I deleted B on the edit page, B was gone, but it''s also deleted 
from table B.  What I want is disassociate B from A and keep B in its 
table when I do the delete.  Is there a way to do it?

Another problem is when I add B to A, if B already exists in table B, 
can I link to B instead of creating a duplicate one in table B?
Thanks.
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