API - add preference for imperial units conversion

fittrackee/application/models.py

@@ -1,6 +1,7 @@
 from typing import Dict
 
 from flask import current_app
+from sqlalchemy import exc
 from sqlalchemy.engine.base import Connection
 from sqlalchemy.event import listens_for
 from sqlalchemy.ext.declarative import DeclarativeMeta
@@ -25,7 +26,15 @@ class AppConfig(BaseModel):
 
     @property
     def is_registration_enabled(self) -> bool:
-        nb_users = User.query.count()
+        try:
+            nb_users = User.query.count()
+        except exc.ProgrammingError as e:
+            # workaround for user model related migrations
+            if 'psycopg2.errors.UndefinedColumn' in str(e):
+                result = db.engine.execute("SELECT COUNT(*) FROM users;")
+                nb_users = result.fetchone()[0]
+            else:
+                raise e
         return self.max_users == 0 or nb_users < self.max_users
 
     @property