Say I have a model like so:
class Settings(db.Model):
country = db.StringProperty(required=True, choices=['us', uk',...])
user = db.UserProperty(auto_current_user_add=True)
a form like so:
class SettingsForm(djangoforms.ModelForm):
class Meta:
model = Settings
exclude = ['user']
Also (obviously) these settings are one per user. To guarantee uniqueness,
settings will have a key = 'settings:' + user.email().
Now I want to implement my request handler:
class Settings(webapp.RequestHandler):
@login_required
def get(self):
user = users.get_current_user()
settings = Settings.get_by_key_name('settings:' + user.email())
if settings:
settings_form = SettingsForm(instance=settings)
else:
settings_form = SettingsForm()
-- render this stuff
def post(self):
settings_form = forms.SettingsForm(data=self.request.POST)
if settings_form.is_valid():
-- *** Problem here ***
else:
-- handle error case
At the point above marked as *** Problem here *** I do not know how to save
this entity properly. First I need to set the keyname, but I cannot do that
after the entity is created. Well I can if I set entity._key_name but that
is using private data that might change at some point in the future. Second,
I really need to do Model.get_or_insert() to avoid race conditions. So I
need to "unpack" the properties from the form and make a call to
Model.get_or_insert().
This seems like a recurring enough pattern. How do I do this the "right
way"?
Thanks in advance,
--
Alkis
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