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Odoo Development Essentials by Daniel Reis

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Relations between models

Looking again at our module design, we have these relations:

  • Each task has a stage – that's a many to one relation, also known as a foreign key. The inverse relation is a one to many, meaning that each stage can have many tasks.
  • Each task can have many tags – that's a many to many relation. The inverse relation, of course, is also a many to many, since each tag can also have many tasks.

Let's add the corresponding relation fields to the to-do tasks in our todo_ui/todo_model.py file:

class TodoTask(models.Model):
    _inherit = 'todo.task'
    stage_id = fields.Many2one('todo.task.stage', 'Stage')
    tag_ids = fields.Many2many('todo.task.tag', string='Tags')

The preceding code shows the basic syntax for these fields, setting the related ...

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