def get_one_or_create(cls, create_kwargs=None, **kwargs):
"""Race free django-style get or create."""
query = Session.query(cls).filter_by(**kwargs)
try:
return query.one()
except NoResultFound:
Session.begin_nested()
kwargs.update(create_kwargs or {})
new = cls(**kwargs)
Session.add(new)
try:
Session.commit()
return new
except IntegrityError:
Session.rollback()
return query.one()
def on_post(self, request, response):
"""Create a new User."""
schema = UserSchema()
try:
result = schema.load(request.document)
except ValidationError as error:
raise HTTPBadRequest(
'Invalid document submitted',
error.messages,
)
user = result.data
Session.add(user)
# Commit early to return the id in the uri
Session.commit()
response.document = {
'uri': 'http://localhost:8000/user/{}'.format(user.email)
}
response.status = HTTP_CREATED