Tweak the uuid backfill to leave the uuid column nullable.

data/database.py

@@ -137,7 +137,7 @@ class BaseModel(ReadSlaveModel):
 
 
 class User(BaseModel):
-  uuid = CharField(default=uuid_generator, max_length=36)
+  uuid = CharField(default=uuid_generator, max_length=36, null=True)
   username = CharField(unique=True, index=True)
   password_hash = CharField(null=True)
   email = CharField(unique=True, index=True,

data/migrations/versions/17f11e265e13_add_uuid_field_to_user.py

@@ -15,8 +15,9 @@ import sqlalchemy as sa
 from sqlalchemy.dialects import mysql
 from util.backfill_user_uuids import backfill_user_uuids
 
+
 def upgrade(tables):
-    op.add_column('user', sa.Column('uuid', sa.String(length=36), nullable=False))
+    op.add_column('user', sa.Column('uuid', sa.String(length=36), nullable=True))
     backfill_user_uuids()
 
 

util/backfill_user_uuids.py

@@ -1,7 +1,7 @@
 import logging
 import uuid
 
-from data.database import User, configure, db
+from data.database import User, db
 from app import app
 
 LOGGER = logging.getLogger(__name__)
@@ -11,15 +11,14 @@ def backfill_user_uuids():
   LOGGER.setLevel(logging.DEBUG)
   LOGGER.debug('User UUID Backfill: Began execution')
 
-  # Make sure we have a reference to the current DB.
-  configure(app.config)
-  LOGGER.debug('User UUID Backfill: Database configured')
 
   # Check to see if any users are missing uuids.
-  has_missing_uuids = bool(list(User
-                                .select(User.id)
-                                .where(User.uuid >> None)
-                                .limit(1)))
+  has_missing_uuids = True
+  try:
+    User.select().where(User.uuid >> None).get()
+  except User.DoesNotExist:
+    has_missing_uuids = False
+
   if not has_missing_uuids:
     LOGGER.debug('User UUID Backfill: No migration needed')
     return
@@ -46,6 +45,7 @@ def backfill_user_uuids():
         except User.DoesNotExist:
           pass
 
+
 if __name__ == "__main__":
   logging.basicConfig(level=logging.DEBUG)
   logging.getLogger('boto').setLevel(logging.CRITICAL)