[core][deps] Use sqlalchemy_utils instead of copy-paste code for merging references

This fixes issues when using SQLite

Signed-off-by: Ferdinand Thiessen <rpm@fthiessen.de>

flaschengeist/controller/userController.py

@@ -3,6 +3,7 @@ import secrets
 
 from io import BytesIO
 from sqlalchemy import exc
+from sqlalchemy_utils import merge_references
 from datetime import datetime, timedelta, timezone
 from flask.helpers import send_file
 from werkzeug.exceptions import NotFound, BadRequest, Forbidden
@@ -14,7 +15,6 @@ from ..models import Notification, User, Role
 from ..models.user import _PasswordReset
 from ..utils.hook import Hook
 from ..utils.datetime import from_iso_format
-from ..utils.foreign_keys import merge_references
 from ..controller import imageController, messageController, pluginController, sessionController
 from ..plugins import AuthPlugin
 

flaschengeist/utils/foreign_keys.py

@@ -1,51 +0,0 @@
-# Borrowed from https://github.com/kvesteri/sqlalchemy-utils
-# Modifications see: https://github.com/kvesteri/sqlalchemy-utils/issues/561
-# LICENSED under the BSD license, see upstream https://github.com/kvesteri/sqlalchemy-utils/blob/master/LICENSE
-
-import sqlalchemy as sa
-from sqlalchemy.orm import object_session
-
-
-def get_foreign_key_values(fk, obj):
-    mapper = sa.inspect(obj.__class__)
-    return dict(
-        (
-            fk.constraint.columns.values()[index],
-            getattr(obj, element.column.key)
-            if hasattr(obj, element.column.key)
-            else getattr(obj, mapper.get_property_by_column(element.column).key),
-        )
-        for index, element in enumerate(fk.constraint.elements)
-    )
-
-
-def get_referencing_foreign_keys(mixed):
-    tables = [mixed]
-    referencing_foreign_keys = set()
-
-    for table in mixed.metadata.tables.values():
-        if table not in tables:
-            for constraint in table.constraints:
-                if isinstance(constraint, sa.sql.schema.ForeignKeyConstraint):
-                    for fk in constraint.elements:
-                        if any(fk.references(t) for t in tables):
-                            referencing_foreign_keys.add(fk)
-    return referencing_foreign_keys
-
-
-def merge_references(from_, to, foreign_keys=None):
-    """
-    Merge the references of an entity into another entity.
-    """
-    if from_.__tablename__ != to.__tablename__:
-        raise TypeError("The tables of given arguments do not match.")
-
-    session = object_session(from_)
-    foreign_keys = get_referencing_foreign_keys(from_.__table__)
-
-    for fk in foreign_keys:
-        old_values = get_foreign_key_values(fk, from_)
-        new_values = get_foreign_key_values(fk, to)
-        session.query(from_.__mapper__).filter(*[k == old_values[k] for k in old_values]).update(
-            new_values, synchronize_session=False
-        )

setup.cfg

@@ -28,6 +28,7 @@ install_requires =
     flask_migrate>=3.1.0
     flask_sqlalchemy>=2.5.1
     sqlalchemy>=1.4.40
+    sqlalchemy_utils>=0.38.3
     toml
     werkzeug>=2.2.2