Rails - Mar 2010 - Noob stuck - complex model relationships and one of two foreign keys not getting saved or updated.

Rather than posting my code and asking "what''s wrong",
here''s a
simpler version:  The problem is my C''s are not saving or updating the
foreign key for B when I create or update a C.  The foreign key value
remains nil.

A has many Bs
A has many Cs

B has many Cs
B belongs to A
     The B model contains an A_id foreign key field

C belongs to A
C belongs to B
     The C model contains both A_id and B_id foreign key fields


So a C can either belong directly to A (with B being null) or it can
belong to both an A and B.  This is not a C belongs to A through B
relationship - Cs can belong directly to an A.  Cs are created using
current_A.Bs.new, so they are already automatically scoped to the
correct A.

When creating or editing a C, a table of possible Bs is created and
displays correctly and I am able to select one of the possible choices
or leave it set to the default (''none selected'' / nil value)
choice.
This all worked fine before I layered on the A model.  I was able to
create Cs that were either free standing or belonged to a B.

Now, the terminal console shows the URL string contains:
"B_id"=>"15",
so it appears that the select function is grabbing the correct id from
the table for the B choice that was selected.  However, when I then
debug the updated C record, the B_id value is always nil.

So, why isn''t the B_id field getting updated in this situation?

Thanks in advance.






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On Mar 16, 5:47 pm, ander31415
<ander31...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Now, the terminal console shows the URL string contains:
"B_id"=>"15",
> so it appears that the select function is grabbing the correct id from
> the table for the B choice that was selected.  However, when I then
> debug the updated C record, the B_id value is always nil.
>
> So, why isn''t the B_id field getting updated in this situation?
>
Hard to say without seeing what you''re actually doing. I know
you''ve
deliberately not posted code, but without code, unless your basic
premise is fundamentally flawed it''s just guesswork.

Fred

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My error (Noob!) - the model for C had set attr_protected for the B_id
field.  So Rails was doing exactly as I instructed it.  I found this
by reviewing the development log, which included a warning that B_id
was protected against mass updates.

Thanks all.


On Mar 16, 3:13 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Mar 16, 5:47 pm, ander31415
<ander31...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
      *** CUT  ***
>
> Hard to say without seeing what you''re actually doing. I know
you''ve
> deliberately not posted code, but without code, unless your basic
> premise is fundamentally flawed it''s just guesswork.
>
> Fred
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