Validator error when oppening edit form with WTForms 3.2.x

[jgriffon]

I've got this message when I click to edit a row :

INFO:werkzeug:127.0.0.1 - - [10/Dec/2024 08:21:06] "GET /admin/user/edit/?id=1&url=/admin/user/ HTTP/1.1" 500 -
ERROR:werkzeug:Error on request:
Traceback (most recent call last):
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\werkzeug\serving.py", line 370, in run_wsgi
    execute(self.server.app)
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\werkzeug\serving.py", line 331, in execute
    application_iter = app(environ, start_response)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask\app.py", line 1536, in __call__
    return self.wsgi_app(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask\app.py", line 1514, in wsgi_app
    response = self.handle_exception(e)
               ^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_restx\api.py", line 672, in error_router
    return original_handler(e)
           ^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_cors\extension.py", line 194, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
                                                ^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask\app.py", line 1511, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask\app.py", line 919, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_restx\api.py", line 672, in error_router
    return original_handler(e)
           ^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_cors\extension.py", line 194, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
                                                ^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask\app.py", line 917, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask\app.py", line 902, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_admin\base.py", line 69, in inner
    return self._run_view(f, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_admin\base.py", line 369, in _run_view
    return fn(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_admin\model\base.py", line 2149, in edit_view
    form = self.edit_form(obj=model)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_admin\model\base.py", line 1340, in edit_form
    return self._edit_form_class(get_form_data(), obj=obj)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\wtforms\form.py", line 209, in __call__
    return type.__call__(cls, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\flask_admin\form\__init__.py", line 22, in __init__
    super(BaseForm, self).__init__(formdata=formdata, obj=obj, prefix=prefix, **kwargs)
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\wtforms\form.py", line 281, in __init__
    super().__init__(self._unbound_fields, meta=meta_obj, prefix=prefix)
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\wtforms\form.py", line 49, in __init__
    field = meta.bind_field(self, unbound_field, options)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\wtforms\meta.py", line 28, in bind_field
    return unbound_field.bind(form=form, **options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\wtforms\fields\core.py", line 387, in bind
    return self.field_class(*self.args, **kw)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\xxx\AppData\Local\pypoetry\Cache\virtualenvs\bMSMjqU3-py3.11\Lib\site-packages\wtforms\fields\core.py", line 133, in __init__
    for k, v in flags.items():
                ^^^^^^^^^^^^^^
AttributeError: 'tuple' object has no attribute 'items'

This line is no longer allowed :

flask-admin/flask_admin/contrib/sqla/validators.py

Line 22 in 54ec9ba

field_flags = ('unique', )

I take information here :
https://wtforms.readthedocs.io/en/3.2.x/changes/#version-3-2-0
pallets-eco/wtforms#467

New code line might be :

field_flags = {"unique": True}