Help "ruby-fying" this SQL

I just need some help to finish turning this SQL :

SELECT us.name, pt.task, sum(hours) 
  FROM records
  INNER JOIN project_tasks pt ON records.task_id = pt.id   
  INNER JOIN users us ON records.user_id 开发者_StackOverflow中文版= us.id 
  GROUP BY user_id, task

into Ruby SQL similar to this:

test = Record.sum( :hours ,
                      :joins => :project_task,
                      :joins => :user,
                      :conditions => {""} )

ive got this far above but im having trouble working out the conditions. i got the above from converting the SQL to this:

test = Record.select( "name, task, sum(hours)").joins( :project_task).joins( :user).group("user_id, task" )

im new to Ruby so any help would be great

Old style variant will be:

Record.find(:all,
            :select => 'name, task, sum(hours)',
            :joins => 'INNER JOIN project_tasks pt ON records.task_id = pt.id INNER JOIN users us ON records.user_id = us.id',
            :group => 'user_id, task')