ih8promises

//generic util to wrap basic mongo methods in promises
update: function (query, params) {
  return Q.nbind(model.update, model)(query, cleanParams(params), {strict: true, multi: true}).get(0);
  var update = model.update(query)
}
        
//create assignment
return module.exports.insert(clean)
    .then(function (assignment) {
        clean._id = assignment._id;

//create classroom assignment
        return classroomController.createAssignment(clean, request)
            .then(function(googleAssignment) {
                clean.google_id = googleAssignment.id.toString();

//find group
                return groupController.findOne({provider_id: googleAssignment.courseId, mentor: clean.mentor})
                    .then(function(group) {
                        clean.group = group._id;
                        clean.google_assignment_url = googleAssignment.alternateLink

//update assignment
                            return module.exports.update({_id: assignment._id}, clean)
                            .then(function () {
//return updated assignment
                                return module.exports.findOne({_id: assignment._id})

                            })
                    });
            })
    });
}