odoo-survey-addons/survey_custom_matrix/models/survey_label.py

# -*- coding: utf-8 -*-
from odoo import models, fields

TYPES = [
    ('free_text', 'Multiple Lines Text Box'),
    ('textbox', 'Single Line Text Box'),
    ('numerical_box', 'Numerical Value'),
    # ('date', 'Date'),
    ('dropdown', 'Dropdown'),
    ('checkbox', 'Checkbox'),
]


class SurveyLabel(models.Model):
    _inherit = 'survey.label'

    type = fields.Selection(selection=TYPES, string="Type of question", default="checkbox")
    value_ids = fields.Many2many(comodel_name='survey.label.value', string="Values")