FieldUUID

* Django doesn't like it when you have more than one autofield on a model so I refactored FieldUUID into a seperate class.

djangocassandra/db/fields.py

@@ -4,7 +4,8 @@
 from django.db.models import (
     Field,
     AutoField,
-    SubfieldBase
+    SubfieldBase,
+    CharField
 )
 from django.utils.translation import ugettext_lazy as _
 
@@ -75,6 +76,68 @@ def value_to_string(
         ])
 
 
+class FieldUUID(with_metaclass(SubfieldBase, CharField)):
+    description = _('UUID')
+
+    default_error_messages = {
+        'invalid': _("'%(value)s' value must be a valid UUID."),
+    }
+
+    def __init__(
+        self,
+        *args,
+        **kwargs
+    ):
+        if 'default' not in kwargs:
+            kwargs['default'] = uuid.uuid4
+
+        super(FieldUUID, self).__init__(
+            *args,
+            **kwargs
+        )
+
+    def to_python(
+        self,
+        value
+    ):
+        if isinstance(value, uuid.UUID):
+            return str(value)
+
+        else:
+            return value
+
+    def get_prep_value(self, value):
+        value = super(FieldUUID, self).get_prep_value(value)
+        if (
+            value is None or
+            isinstance(value, uuid.UUID)
+        ):
+            return value
+
+        return uuid.UUID(value)
+
+    def get_internal_type(self):
+        return 'FieldUUID'
+
+    @staticmethod
+    def get_auto_value(self):
+        return uuid.uuid4()
+
+    def value_to_string(self, value):
+        if isinstance(value, basestring):
+            return value
+
+        try:
+            return str(value)
+
+        except (TypeError, ValueError):
+            raise Exception(
+                self.error_messages['invalid'],
+                code='invalid',
+                params={'value': value},
+            )
+
+
 class AutoFieldUUID(with_metaclass(SubfieldBase, AutoField)):
     description = _('UUID')
 

djangocassandra/db/meta.py

@@ -18,6 +18,7 @@
 internal_type_to_column_map = {
     'AutoField': columns.Integer,
     'AutoFieldUUID': columns.UUID,
+    'FieldUUID': columns.UUID,
     'RelatedAutoField': columns.UUID,
     'ForeignKey': columns.UUID,
     'OneToOneField': columns.UUID,

setup.py

@@ -2,7 +2,7 @@
 
 setup(
     name='djangocassandra',
-    version='0.4.2',
+    version='0.4.3',
     description='Cassandra support for the Django web framework',
     long_description=(
         'The Cassandra database backend for Django has been '

tests/models.py

@@ -26,7 +26,10 @@
     ForeignKey
 )
 
-from djangocassandra.db.fields import AutoFieldUUID
+from djangocassandra.db.fields import (
+    AutoFieldUUID,
+    FieldUUID
+)
 from djangocassandra.db.models import (
     ColumnFamilyModel,
     ColumnFamilyManager
@@ -157,6 +160,11 @@ class RelatedModelC(Model):
     )
 
 
+class UUIDFieldModel(Model):
+    id = AutoFieldUUID(primary_key=True)
+    uuid = FieldUUID()
+
+
 class ClusterPrimaryKeyModel(ColumnFamilyModel):
     class Cassandra:
         clustering_keys = ['field_2', 'field_3']

tests/test_fields.py

@@ -0,0 +1,38 @@
+import uuid
+from unittest import TestCase
+
+from .models import (
+    UUIDFieldModel
+)
+
+from .util import (
+    connect_db,
+    destroy_db,
+    create_model
+)
+
+
+class UUIDFieldModelTestCase(TestCase):
+    def setUp(self):
+        self.connection = connect_db()
+        self.cached_rows = {}
+
+        create_model(
+            self.connection,
+            UUIDFieldModel
+        )
+
+        import django
+        django.setup()
+
+    def tearDown(self):
+        destroy_db(self.connection)
+
+    def test_create_uuid_field_model(self):
+        instance = UUIDFieldModel.objects.create()
+
+        self.assertIsNotNone(instance)
+        uuid.UUID(instance.uuid)
+        uuid.UUID(instance.id)
+
+        UUIDFieldModel.objects.get(pk=instance.pk)