RE: [Rails] Model.find(:all) - return a list of ids

I currently call find(:all, ...) on one of my models and it
return a page of models.

I am now looking at adding a memcached server and want the
find(:all..) to only return model ids, the models will be
individually retrieved from the cache.

Is this something that ActiveRecord supports or should I
write a custom bit of sql?

You can do custom sql, or use the :select option to limit the columns
returned:

model.find(:all, :select=>'id') returns an array of models with only the
ids loaded

model.find(:all, :select=>'id').collect(&:id) returns an array of ids

if you like using the rest of the find options to help generate your sql
for you.

- donald