warn user when SQLALCHEMY_DATABASE_URI is not set

scotchka · davidism · commit ae15876e20da · 2017-02-25T08:33:11.000-08:00
diff --git a/flask_sqlalchemy/__init__.py b/flask_sqlalchemy/__init__.py
@@ -805,6 +805,9 @@ def init_app(self, app):
         of an application not initialized that way or connections will
         leak.
         """
+        if app.config.get('SQLALCHEMY_DATABASE_URI') is None:
+            warnings.warn(UserWarning('SQLALCHEMY_DATABASE_URI not set. Defaulting to sqlite.'))
+
         app.config.setdefault('SQLALCHEMY_DATABASE_URI', 'sqlite://')
         app.config.setdefault('SQLALCHEMY_BINDS', None)
         app.config.setdefault('SQLALCHEMY_NATIVE_UNICODE', None)
