Flask-AppBuilder 5.0.2 incompatible with marshmallow 4.x / marshmallow-sqlalchemy 1.x

[sp-ealjohani]

Description

FAB 5.0.2 schema auto-generation fails with marshmallow 4.x and marshmallow-sqlalchemy 1.x.

Environment

• Flask-AppBuilder: 5.0.2
• marshmallow: 4.2.1
• marshmallow-sqlalchemy: 1.4.2
• Python: 3.11

Error

KeyError exceptions during API initialization when FAB attempts to auto-generate schemas

Workaround

Pin older versions in requirements.txt:
marshmallow>=3.0.0,<4.0.0
marshmallow-sqlalchemy>=0.29.0,<1.0.0

Suggestion

Consider either:

1. Pinning compatible marshmallow versions in FAB's dependencies
2. Updating FAB to support marshmallow 4.x / marshmallow-sqlalchemy 1.x
3. Documenting this incompatibility in the migration guide