Rails - Jun 2009 - Dynamically connecting a model to databases in a running app…?

Hi All,

I''ve read many of the existing questions/threads on this subject, but
keep in mind that none of them have directly addressed my issue -- or
they have yet to be answered. Also keep in mind that this is NOT a
situation for database.yml as I won''t know the DB info in advance.

That said, I need a solution for DYNAMICALLY connecting to multiple
databases in a Rails app. My situation is that I have multiple data
logging sites, all with a simple data table (EVENTS, TIMESTAMP,
VALUE). These sites need to (and will) remain as they are due to local
applications that need to use them.

What I need is to create an application that maintains a table of
"MYSQL_LOGINS" and uses each of those logins to connect to any one of
various databases and provide charts/graphs for the data therein.

My "data" model will remain the same for all MySQL databases to which
I connect, I simply need to be able to tell my MODEL to connect to a
different DB on the fly. I''m hoping this is amazingly simple, but
we''ll see.

Best.

On Jun 8, 8:03 pm, gberz3 <gbe...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi All,
>
> I''ve read many of the existing questions/threads on this subject,
but
> keep in mind that none of them have directly addressed my issue -- or
> they have yet to be answered. Also keep in mind that this is NOT a
> situation for database.yml as I won''t know the DB info in advance.
>
> That said, I need a solution for DYNAMICALLY connecting to multiple
> databases in a Rails app. My situation is that I have multiple data
> logging sites, all with a simple data table (EVENTS, TIMESTAMP,
> VALUE). These sites need to (and will) remain as they are due to local
> applications that need to use them.
>
Well you can can establish_connection pretty much whenever you want.
Have you tried that ?

Fred
> What I need is to create an application that maintains a table of
> "MYSQL_LOGINS" and uses each of those logins to connect to any
one of
> various databases and provide charts/graphs for the data therein.
>
> My "data" model will remain the same for all MySQL databases to
which
> I connect, I simply need to be able to tell my MODEL to connect to a
> different DB on the fly. I''m hoping this is amazingly simple, but
> we''ll see.
>
> Best.

On Jun 8, 5:36 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
> Well you can can establish_connection pretty much whenever you want.
> Have you tried that ?
>
> Fred

So you''re suggesting I call it on the model like
"User.establish_connection" as needed?  I wasn''t aware that
was
something reasonable/feasible.  I''ll give it a try.