Required fields for many-to-many relationships

[leonth]

Hi, I tried using flask-admin for a many-to-many relationship defined in SQLAlchemy like so: http://docs.sqlalchemy.org/en/rel_0_7/orm/tutorial.html#building-a-many-to-many-relationship

The UI works great, however because the fields are designated as "required", on a blank database I am not able to use the UI to add any rows to the database. The forms to add rows in both tables will give an error "This field is required.", and the select box is empty because the other table is still empty. What should I do?

[mrjoes]

Uh, you have M2M in both directions?

[khamukhin]

Some workaround. I've used "form_args" and "wtf.Optional()" to fix such problem with M2M relationships.

class MyModelView(ModelView):
    form_args = dict(
        reports=dict(validators=[wtf.Optional()]),
        products=dict(validators=[wtf.Optional()])
    )

admin = Admin(app, name='My Admin')
admin.add_view(MyModelView(MyModel, db.session))