Query multiple models/tables for an "Overview" page

Hey guys. I want to create a overview page for my application that
contains the latest activity on the site, from a few different
sources. Lets say we have messages, comments, files and tasks (much
like Basecamp, if you’ve ever used it) and you want to display them
all in one big list, intermixed, and sorted by date.

I know I could run queries on all the separate models and then combine
the results, but because this will be paginated, I would end up
getting more records than I really need, and having to trash some,
that seems wasteful and and potentially a hit to performance. So, I’d
really like to be able to put a LIMIT on the DB query itself, as well,
if possible.

What do you think is the best way to go about this? Thanks a lot guys!

Seirie wrote:

Hey guys. I want to create a overview page for my application that
contains the latest activity on the site, from a few different
sources. Lets say we have messages, comments, files and tasks (much
like Basecamp, if you’ve ever used it) and you want to display them
all in one big list, intermixed, and sorted by date.

I know I could run queries on all the separate models and then combine
the results, but because this will be paginated, I would end up
getting more records than I really need, and having to trash some,
that seems wasteful and and potentially a hit to performance. So, I’d
really like to be able to put a LIMIT on the DB query itself, as well,
if possible.

If you’re querying multiple tables, then there is no way to do this. If
you’re going to display a total of (say) 30 records, I think you’ll just
have to do LIMIT 30 on each table and discard the rest.

You could do some join trickery to get around this, but I suspect that
AR wouldn’t recognize the results.

What do you think is the best way to go about this? Thanks a lot guys!

Best,
–Â
Marnen Laibow-Koser
http://www.marnen.org
[email protected]

Hmm, alright, I suspected that might be the case. Suppose it’s not
such a big loss. Thanks Marnen!

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