From: Federico Caselli <cfederico87@gmail.com>
Date: Tue, 16 Dec 2025 20:30:47 +0000 (+0100)
Subject: Avoid deprecation warning in add/drop constraint
X-Git-Tag: rel_1_18_0~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c94816e864f6d89842ebf248cf116031287d506e;p=thirdparty%2Fsqlalchemy%2Falembic.git

Avoid deprecation warning in add/drop constraint

Ensure that alembic is compatible with the changes added in
https://github.com/sqlalchemy/sqlalchemy/issues/13006
by explicitly setting isolate_from_table=True in sqlalchemy 2.1

Change-Id: I0dd3b2aa2932ca11fbde113fe4d92306fb1f2bbb
---

diff --git a/alembic/ddl/impl.py b/alembic/ddl/impl.py
index d352f12e..4e3f29ae 100644
--- a/alembic/ddl/impl.py
+++ b/alembic/ddl/impl.py
@@ -399,11 +399,15 @@ class DefaultImpl(metaclass=ImplMeta):
             )
         )
 
-    def add_constraint(self, const: Any) -> None:
+    def add_constraint(self, const: Any, **kw: Any) -> None:
         if const._create_rule is None or const._create_rule(self):
-            self._exec(schema.AddConstraint(const))
+            if sqla_compat.sqla_2_1:
+                kw.setdefault("isolate_from_table", True)
+            self._exec(schema.AddConstraint(const, **kw))
 
     def drop_constraint(self, const: Constraint, **kw: Any) -> None:
+        if sqla_compat.sqla_2_1:
+            kw.setdefault("isolate_from_table", True)
         self._exec(schema.DropConstraint(const, **kw))
 
     def rename_table(
diff --git a/alembic/ddl/sqlite.py b/alembic/ddl/sqlite.py
index 5f141330..c260d53f 100644
--- a/alembic/ddl/sqlite.py
+++ b/alembic/ddl/sqlite.py
@@ -74,7 +74,7 @@ class SQLiteImpl(DefaultImpl):
         else:
             return False
 
-    def add_constraint(self, const: Constraint):
+    def add_constraint(self, const: Constraint, **kw: Any):
         # attempt to distinguish between an
         # auto-gen constraint and an explicit one
         if const._create_rule is None:
diff --git a/docs/build/unreleased/constraint_deprecation.rst b/docs/build/unreleased/constraint_deprecation.rst
new file mode 100644
index 00000000..c156dcf5
--- /dev/null
+++ b/docs/build/unreleased/constraint_deprecation.rst
@@ -0,0 +1,8 @@
+.. change::
+    :tags: usecase
+
+    Avoid deprecation warning in add/drop constraint added in SQLAlchemy 2.1.
+    Ensure that alembic is compatible with the changes added in
+    https://github.com/sqlalchemy/sqlalchemy/issues/13006
+    by explicitly setting ``isolate_from_table=True`` when running with
+    SQLAlchemy 2.1 or greater.