ruby on rails - Counting and grouping at the same time

Question

I have a Mail model with the following schema:

t.string   "mail"
t.integer  "country"
t.boolean  "validated"
t.datetime "created_at"
t.datetime "updated_at"

And I want to find the top 5 countries in the database, so i go ahead and type

@top5 = Mail.find(:all,:group =>  'country',:conditions => [ "validated = ?" , "t" ], :limit => 5 )

This will tell me the groups(i need an order by i dont know how to write)

@top5 = Mail.count(:all,:group =>  'country',:conditions => [ "validated = ?" , "t" ], :limit => 5 )

This will tell me how many mails are in each group

Im wondering if i can group and count in just one go

Answer 1

Try:

Mail.count(:group => 'country', :conditions => ['validated = ?', 't'])

I'm not sure count accepts :limit though.

EDIT:

I think this is more readable:

Mail.count(:group => :country, :conditions => {:validated => true})