Re: Re: Query Multiple tables

PalaniKannan K
Tue, 14 Sep 2010 07:52:07 -0000

On 13 September 2010 19:54, Jeff
<cohen.jeff-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> On Sep 13, 6:10 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
> > On Sep 13, 11:59 am, PalaniKannan K
<kpalanikan...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:>
> Hi,
> >
> > > select * from table1 inner join table2 on table1.foreign_key >
> > table2.foreign_key
> >
> > > select * from table1 inner join table2 on table1.foreign_key >
> > table2.foreign_key join table3 on
table2.foreign_key=table3.foreign_key
> >
> > > These  are the SQL commands, I need to apply it in Rails. Kindly
tell
> me the
> > > syntax in Rails to apply these SQL commands instead of sql_query.
> >
> > Take a look at the :joins option to find (or the joins scope
> > modifiying thing in rails 3)
> >
> > Fred
> >
>
> I think has_many :through might also be what you''re looking for.
You
> can avoid writing SQL 99% of the time if you learn how to use the
> various flavors of ActiveRecord associations.
>
Dear Jeff,
In model I can apply has_many and belongs_to option. How I can apply those
tables in Controller and View... I am new bee... I tried with some
tutorials, every tutorial i m getting instructions to use has_many and
belongs_to in model. I am getting problem with controllers and view to use
"find" with foreign_keys if I use those options in model.

>
> Jeff
>
>
--
With Regards
Palani Kannan. K

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