Re: Query Multiple tables

Jeff
Mon, 13 Sep 2010 17:54:15 -0000

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.

Jeff

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