For the to-do tasks to have a kanban board, we need stages. Stages are the board columns, and each task will fit into one of these columns.

Let's add the following code to the todo_ui/todo_model.py file:

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

class Tag(models.Model):
    _name = 'todo.task.tag'
    name = fields.Char('Name', 40, translate=True)

class Stage(models.Model):
    _name = 'todo.task.stage'
    _order = 'sequence,name'
    _rec_name = 'name'  # the default
    _table = 'todo_task_stage'  # the default
    name = fields.Char('Name', 40, translate=True)
    sequence = fields.Integer('Sequence')

Here, we created the two new Models we will be referencing in the to-do tasks.

Focusing on the task stages, we have a Python class, Stage, based on the class models.Model, defining a new Odoo model, todo.task.stage. We also defined two fields, name and sequence. We can see some model attributes, (prefixed with an underscore) that are new to us. Let's...