/** * Finds user by email or username. * * @param{String} query */User.findByEmailOrUsername=function(query){varpromises=[];promises.push(User.exists({email: query}));promises.push(User.exists({username: query}));returnwhen.any(promises);}/** * Tests if user exists based on given parameters. * * returns user's id if user exists and false otherwise. * @param{Object} search */User.exists=function(search){vardeferred=when.defer();User.find(search,function(err,ids){if(err||ids.length==0){deferred.reject(newError('user not found'));}else{deferred.resolve(ids[0]);}});returndeferred.promise;}