Make sure new media has a new uuid added on

mediagoblin/db/migrations.py

@@ -25,12 +25,11 @@ from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.sql import and_
 from migrate.changeset.constraint import UniqueConstraint
 
-
 from mediagoblin.db.extratypes import JSONEncoded, MutationDict
 from mediagoblin.db.migration_tools import (
     RegisterMigration, inspect_table, replace_table_hack)
 from mediagoblin.db.models import (MediaEntry, Collection, MediaComment, User,
-        Privilege)
+        create_uuid, Privilege)
 from mediagoblin.db.extratypes import JSONEncoded, MutationDict
 
 MIGRATIONS = {}

mediagoblin/db/models.py

@@ -237,6 +237,10 @@ class NonceTimestamp(Base):
     timestamp = Column(DateTime, nullable=False, primary_key=True)
 
 
+def create_uuid():
+    """ Creates a new uuid which is suitable for use in a URL """
+    return base64.urlsafe_b64encode(uuid.uuid4().bytes).strip("=")
+
 class MediaEntry(Base, MediaEntryMixin):
     """
     TODO: Consider fetching the media_files using join