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

 Mail.find(     :all,      :select => 'count(*) count, country',      :group => 'country',      :conditions => ['validated = ?', 't' ],      :order => 'count DESC',     :limit => 5) 

This should give you records that have a country attribute and a count attribute.