named_scope - :group (finds first entry?)

Hi,

I am currently a little confused with trying to manipulate a named
scope that I currently have.

I have two associated models e.g

Catalogue,

has_many :articles

Article:

belongs_to :catalogue

my named scope looks like this (in Class Article)

named scope :finished_articles, { :conditions => [ :finished =>
true ] }

This works fine on it's own, but I need to trim it to show only the
most recent finished article per catalogue (based on created_at field)
- currently I may have many finished articles per catalogue, but want
to find the latest one.

I have tried to use two named scopes, the other looking like this:

named scope :limited, { :group => "catalogue_id" }

which does only leave one entry per catalogue, but rather than being
the most recent entry it is the first created. But I want to gather
the most recently created article - one from each
catalogue.

I just want to be able to reverse this order, but I can't seem to
figure out how to do this (I have a default order already set, but
this only seems to affect the scope after it has been rendered..)
Also
setting the order does not seem to have an effect on how the
instances
are gathered from the database.

Thank you for any suggestions!

it it is rails 3 I think you could use only,

http://www.railway.at/2010/03/09/named-scopes-are-dead/

and

Active record querying ??

http://edgeguides.rubyonrails.org/active_record_querying.html

Hi Pete,

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