Hello everyone, i'm new to odoo developing and this is my first module.

I want to assign material resources to project task.(most of the time vehicles, we have many)

I want to know which cars are free and which ones are assigned to tasks.

So i created a boolean field named assigned to be True when a material resource is added to a task(i.e task_id is no more null), but it is always false when i check the database.So the function i created seems to not work for some reason.

from openerp import models, fields, api

class MaterialResource(models.Model):

    _name = 'material.resource'

    name = fields.Char('Material Resource', required=True)

    description = fields.Selection(string='Description', selection=[('m', 'Mazda'), ('f', 'Ford')])

    task_id = fields.Many2one("project.task", inverse_name="material_resource_ids")

    assigned = fields.Boolean(compute="_get_material_status", store="True")

    @api.one

    @api.depends('task_id')

    def _get_material_status(self):

        if self.task_id is None:

            return False

        else:

            return True

class TaskMaterial(models.Model):

    _inherit = 'project.task'

    material_resource_ids = fields.One2many(comodel_name="material.resource", inverse_name="task_id", string="Material Resource")