Flask-Admin create view with SQLAlchemy context-sensitive functions

I have a data model which has a column that depends on other column values, following the instructions in this page I've created a context-sensitive function which is used to determine the value of this particular column on creation, something like this:

def get_column_value_from_context(context):
    # Instructions to produce value

    return value


class MyModel(db.Model):
    id = db.Column(db.Integer,
                   primary_key=True)
    my_column = db.Column(db.String(64),
                          nullable=False,
                          default=get_column_value_from_context)
    name = db.Column(db.String(32),
                     nullable=False,
                     unique=True,
                     index=True)
    title = db.Column(db.String(128),
                      nullable=False)
    description = db.Column(db.String(256),
                            nullable=False)

This approach works pretty decent, I can create rows without problems from the command line or using a script.

I've also added a ModelView to the app using Flask-Admin:

class MyModelView(ModelView):
    can_view_details = True
    can_set_page_size = True
    can_export = True


admin.add_view(MyModelView(MyModel, db.session))

This also works pretty decent until I click the Create button in the list view. I receive this error:

AttributeError: 'NoneType' object has no attribute 'get_current_parameters'

Because the implementation of the create_model handler in the ModelView is this:

def create_model(self, form):
    """
        Create model from form.
        :param form:
            Form instance
    """
    try:
        model = self.model()
        form.populate_obj(model)
        self.session.add(model)
        self._on_model_change(form, model, True)
        self.session.commit()
    except Exception as ex:
        if not self.handle_view_exception(ex):
            flash(gettext('Failed to create record. %(error)s', error=str(ex)), 'error')
            log.exception('Failed to create record.')

        self.session.rollback()

        return False
    else:
        self.after_model_change(form, model, True)


    return model

and here there isn't a context when the model is instantiated. So, I've created a custom view where the model instantiation in the creation handler could be redefined:

class CustomSQLAView(ModelView):
    def __init__(self, *args, **kwargs):
        super(CustomSQLAView, self).__init__(*args, **kwargs)

    def create_model(self, form):
        """
            Create model from form.
            :param form:
                Form instance
        """
        try:
            model = self.get_populated_model(form)
            self.session.add(model)
            self._on_model_change(form, model, True)
            self.session.commit()
        except Exception as ex:
            if not self.handle_view_exception(ex):
                flash(gettext('Failed to create record. %(error)s', error=str(ex)), 'error')
                log.exception('Failed to create record.')

            self.session.rollback()

            return False
        else:
            self.after_model_change(form, model, True)

        return model

    def get_populated_model(self, form):
        model = self.model()
        form.populate_obj(model)

        return model

Now I can redefine the get_populated_model method to instantiate the model in the usual way:

class MyModelView(CustomSQLAView):
    can_view_details = True
    can_set_page_size = True
    can_export = True

    def get_populated_model(self, form):
        model = self.model(
            name=form.name.data,
            title=form.title.data,
            description=form.description.data,
        )

        return model

Despite that this works, I suspect it breaks something. Flask-Admin has several implementation of the populate_obj method of forms and fields, so I would like to keep everything safe.

What is the proper way to do this?

from Flask-Admin create view with SQLAlchemy context-sensitive functions