You need a data structure already filled with values. Let’s assume we want to
use this widget in a wizard that lets the user fill in planned hours for one
task per project per user. In this case, we can use project.task as our
data model and point to it from our wizard. The crucial part is that we fill
the field in the default function:
from odoo import fields, models
class MyWizard(models.TransientModel):
_name = 'my.wizard'
def _default_task_ids(self):
# your list of project should come from the context, some selection
# in a previous wizard or wherever else
projects = self.env['project.project'].browse([1, 2, 3])
# same with users
users = self.env['res.users'].browse([1, 2, 3])
return [
(0, 0, {
'name': 'Sample task name',
'project_id': p.id,
'user_id': u.id,
'planned_hours': 0,
'message_needaction': False,
'date_deadline': fields.Date.today(),
})
# if the project doesn't have a task for the user,
# create a new one
if not p.task_ids.filtered(lambda x: x.user_id == u) else
# otherwise, return the task
(4, p.task_ids.filtered(lambda x: x.user_id == u)[0].id)
for p in projects
for u in users
]
task_ids = fields.Many2many('project.task', default=_default_task_ids)
Now in our wizard, we can use:
<field name="task_ids" widget="x2many_2d_matrix" field_x_axis="project_id" field_y_axis="user_id" field_value="planned_hours">
<tree>
<field name="task_ids"/>
<field name="project_id"/>
<field name="user_id"/>
<field name="planned_hours"/>
</tree>
</field>
Note that all values in the matrix must exist, so you need to create them previously if not present, but you can control visually the editability of the fields in the matrix through field_att_disabled option with a control field.