Re: Multiple Join Tables between Two Tables? Another solution?

Robert Gann
Mon, 25 Jun 2007 19:10:32 -0000

Thanks!  I''ve been using Agile Web Development for Rails as a
reference.  My
solution was inspired by a section entitled Using Models as Join Tables.  I
had noticed that the :through option was mentioned on the next page, but did
not see how to use that.

I''ll give it a try.  Thanks again!  Having four join tables just did
not
seem right.

On 6/25/07, Michael Latta <lattam-ee4meeAH724@public.gmane.org>
wrote:
>
> I would recommend against having 4 tables for joins.  Just have
> one :through association with a model that has acts_as_list to order
> them.
>
> Michael
>
>
>
> On Jun 25, 2007, at 11:34 AM, rcgann wrote:
>
> >
> > I''m a RoR newbie, so I''d like to be sure
I''m on the right track.  I''m
> > coding an application where I have one table with students and another
> > table with first year seminars (fyss).  The students have listed 4 fys
> > preferences in order.
> >
> > Since the FYS seminars are listed in order and we are trying to give
> > student their first choices, I cannot use a 1 - n relationship between
> > table students and table fyss.
> >
> > My design uses a models as join tables.  It works as follows:
> >
> > - I have a table students with an id and a name.
> > - I have a table fyss with an id and a course title.
> > - I have a table fyschoice1s with an id, a student_id, and a fys_id.
> > - I have a table fyschoice2s with an id, a student_id, and a fys_id.
> > - I have a table fyschoice3s with an id, a student_id, and a fys_id.
> > - I have a table fyschoice4s with an id, a student_id, and a fys_id.
> >
> > The last four tables have a 1 - 1 relationship between, for example,
> > students and fsychoices1 and between fyss and fyschoices1.
> >
> > Is this the best solution?  I''d deeply appreciate any
guidance.
> > Thanks in advance.
> >
> >
> > > >
>
>
>

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