[soc2010/query-refactor] Remove some nastiness from db_type()

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2010/query-refactor@13409 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/mongodb/base.py

@@ -9,7 +9,6 @@ from django.utils.importlib import import_module
 
 class DatabaseFeatures(object):
     interprets_empty_strings_as_nulls = False
-    typed_columns = False
     sql_nulls = False
 
 

django/contrib/mongodb/creation.py

@@ -5,6 +5,9 @@ class DatabaseCreation(object):
     def __init__(self, connection):
         self.connection = connection
     
+    def db_type(self, field):
+        return None
+    
     def create_test_db(self, verbosity, autoclobber):
         if self.connection.settings_dict['TEST_NAME']:
             test_database_name = self.connection.settings_dict['TEST_NAME']

django/db/backends/creation.py

@@ -3,6 +3,8 @@ import time
 
 from django.conf import settings
 from django.core.management import call_command
+from django.utils.datastructures import DictWrapper
+
 
 # The prefix to put on the default database name when creating
 # the test database.
@@ -27,6 +29,13 @@ class BaseDatabaseCreation(object):
         """
         return '%x' % (abs(hash(args)) % 4294967296L)  # 2**32
     
+    def db_type(self, field):
+        data = DictWrapper(field.__dict__, self.connection.ops.quote_name, "qn_")
+        try:
+            return self.connection.creation.data_types[field.get_internal_type()] % data
+        except KeyError:
+            return None
+
     def sql_create_model(self, model, style, known_models=set()):
         """
         Returns the SQL required to create a single model, as a tuple of:

django/db/models/fields/__init__.py

@@ -13,7 +13,6 @@ from django.db.models.query_utils import QueryWrapper
 from django.conf import settings
 from django import forms
 from django.core import exceptions, validators
-from django.utils.datastructures import DictWrapper
 from django.utils.functional import curry
 from django.utils.text import capfirst
 from django.utils.translation import ugettext_lazy as _
@@ -215,13 +214,7 @@ class Field(object):
         # mapped to one of the built-in Django field types. In this case, you
         # can implement db_type() instead of get_internal_type() to specify
         # exactly which wacky database column type you want to use.
-        if not getattr(connection.features, "typed_columns", True):
-            return None
-        data = DictWrapper(self.__dict__, connection.ops.quote_name, "qn_")
-        try:
-            return connection.creation.data_types[self.get_internal_type()] % data
-        except KeyError:
-            return None
+        return connection.creation.db_type(self)
 
     def unique(self):
         return self._unique or self.primary_key