Hi all,
I have a class in which I want to override the get_or_create method.
Basically if my class doesn't store the answer I want it do some
process to get the answer and it's not provided. The method is really
a get_or_retrieve method. I have heavily borrowed this from db/models/
query.py and I can't figure out the line "obj = self.model(**params)".
I don't understand what the attr model needs to be and it's not
intuitively obvious what this should be. Even looking back at the
query.py I can't figure this out. Can someone explain this to me? I
would really like to understand it and fix my code.
So here's the class:
class P4User(models.Model):
user = models.CharField(max_length=100, primary_key=True)
fullname = models.CharField(max_length=256)
email = models.EmailField()
access = models.DateField(auto_now_add=True)
update = models.DateField(auto_now_add=True)
@classmethod
def get_or_retrieve(self, username, auto_now_add=False):
try:
return self.get(user=username), False
except self.model.DoesNotExist:
import P4
import datetime
from django.db import connection, transaction, IntegrityError
p4 = P4.P4().connect()
kwargs = p4.run(("user", "-o", username))[0]
p4.disconnect()
params = dict( [(k.lower(),v) for k, v in kwargs.items
()])
obj = self.model(**params)
sid = transaction.savepoint()
obj.save(force_insert=True)
transaction.savepoint_commit(sid)
return obj, True
except IntegrityError, e:
transaction.savepoint_rollback(sid)
try:
return self.get(**kwargs), False
except self.model.DoesNotExist:
raise e
def __unicode__(self):
return str(self.user)
I am able to get the params but I haven't defined self.model. I don't
understand what that needs to be and it's not intuitively obvious what
value that should be. Even looking back at the query.py I can't figure
this out. Can someone explain this to me? I would really like to
understand it and fix my code.
Thanks
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