Python-сообщество

class MyClass(ModelView):
    def on_model_change(self, form, model, is_created):
        if is_created:
            ...
        else:
            id = get_pk_value(model)
            ...
        if not custom_validator(id):
            raise ValidationError('not valid')
        super().on_model_change(form, model, is_created)

NameError: name 'get_pk_value' is not defined

File "/usr/home/kaldown/projects/flask/app/views.py", line 85, in on_model_change
id_row = get_pk_value(self, model)
NameError: name 'get_pk_value' is not defined

def on_model_change(self, form, model, is_created):
        if not_empty(form.name.data):
            if is_created:
                have_count = count_sum(form.count.name, form.name.data) -\
                            count_sum(form.count_out.name, form.name.data)
            else:
                id = get_pk_value(form)
                count, count_out = rollback_count(id)
                have_count = count_sum(form.count.name, form.name.data) -\
                            count_sum(form.count_out.name, form.name.data) -\
                            count + count_out
                            
            if form.count_out.data > have_count + form.count.data:
                raise ValidationError('На выход больше чем имеется')
        else:
            super().on_model_change(form, model, is_created)

def count_sum(what_to_sum, where_to_sum):
    with conn.cursor() as cur:
        cur.execute(
                """
                SELECT SUM(%s) FROM garage WHERE
                lower(name)=lower('%s')
                """
                % (what_to_sum, where_to_sum))
        return cur.fetchone()[0]
def not_empty(name_field):
    with conn.cursor() as cur:
        cur.execute(
                """
                SELECT name FROM garage WHERE lower(name)=lower('%s')
                """
                % (name_field))
        return cur.fetchone() is not None
def rollback_count(id_row):
    with conn.cursor() as cur:
        cur.execute(
                """
                SELECT count,count_out FROM garage WHERE id=%s
                """
                % (id_row))
        return cur.fetchone()

self.get_pk_value(model)