mysql - Convert Inner Join to Left Join in rails -


i have rake file , , have code on . . 

   if circle[:conference2_total_channels].present?                 conf = confbridge.find(:all, :conditions => ["confbridges.cid = ?",circle.circle_number],                 :joins => [:confbridge_participants],                 :select => 'confbridges.id, confbridges.confno, confbridges.max_member, (confbridges.max_member - 5) additional , (confbridges.max_member - ifnull(confbridge_participants.active,0)) vacant')              end

the return of code 

select confbridges.id, confbridges.confno, confbridges.max_member, (confbridges.max_member - 5) additional , (confbridges.max_member - ifnull(confbridge_participants.active,0)) vacant `confbridges` **inner join** `confbridge_participants` on `confbridge_participants`.`confbridge_id` = `confbridges`.`id` (confbridges.cid = '0090000092')

it inner join

how can change left join

like 

select confbridges.id, confbridges.confno, confbridges.max_member, (confbridges.max_member - 5) additional , (confbridges.max_member - ifnull(confbridge_participants.active,0)) vacant `confbridges` **left join** `confbridge_participants` on `confbridge_participants`.`confbridge_id` = `confbridges`.`id` (confbridges.cid = '0090000092')

thanks :)

this how write it:

confbridge.where("confbridges.cid = ?",circle.circle_number)   .joins("left join confbridge_participants           on confbridge_participants.confbridge_id = confbridges.id")   .select(...your select statement)

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