I am trying to setup a custom manager to connect to another database
on the same server as my default mysql connection. I have tried
following the examples here
http://groups.google.com/group/django-developers/browse_thread/thread/5d8c73eb483029af/19b19ed79bbbfa0d
and here
http://www.djangrrl.com/view/multiple-database-connection-a-simple-use-case/
but have had no luck. I get an empty tuple when returning
MyCustomModel.objects.all().
Here is what I have in manager.py
from django.db import models
from django.db.backends.mysql.base import DatabaseWrapper
from django.conf import settings
class CustomManager(models.Manager):
"""
This Manager lets you set the DATABASE_NAME on a per-model basis.
"""
def __init__(self, database_name, *args, **kwargs):
models.Manager.__init__(self, *args, **kwargs)
self.database_name = database_name
def get_query_set(self):
qs = models.Manager.get_query_set(self)
qs.query.connection = self.get_db_wrapper()
return qs
def get_db_wrapper(self):
# Monkeypatch the settings file. This is not thread-safe!
old_db_name = settings.DATABASE_NAME
settings.DATABASE_NAME = self.database_name
wrapper = DatabaseWrapper()
wrapper._cursor(settings)
settings.DATABASE_NAME = old_db_name
return wrapper
and here is what I have in models.py:
from django.db import models
from myproject.myapp.manager import CustomManager
class MyCustomModel(models.Model):
field1 = models.CharField(max_length=765)
attribute = models.CharField(max_length=765)
objects = CustomManager('custom_database_name')
class Meta:
abstract = True
But if I run MyCustomModel.objects.all() I get an empty list.
I am pretty new at this stuff so I am not sure if this works with
1.0.2, I am going to look into the Manager code to see if I can figure
it out but I am just wondering if I am doing something wrong here.
Thanks,
Justin
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