lazymodel.py

import gaerun
  
from google.appengine.ext import db

class LazyModelMixin:
    
    @classmethod
    def get_put_by_key_name(cls, key_name, **kwargs):
      object = cls.get_by_key_name(key_name) or cls(key_name=key_name, **kwargs)
      if object.is_saved:
        for k,v in kwargs.items():
          setattr(object, k, v)
      object.put()
      return object

class LazyModel(db.Model, LazyModelMixin):
    pass

class TestModel(LazyModel):
    name = db.StringProperty(required=True)
        
test = TestModel.get_put_by_key_name("luke", name="Luke")
print test.name