i'am added a car field in product template which related  to the car model that contains all cars, also i'am work in multi compny, and i'am also added a many2many relation with car model, 
all i need is to filter the cars in product template and display all cars that i have been assign in the company  

this my code 

class cars(models.Model):
    _name = 'cars'

    name = fields.Char( string="Car",translate=True , required=True, ondelete='restrict')

class autopartscompany(models.Model):
    _inherit = 'res.company'

    car_ids = fields.Many2many(comodel_name="cars",string="Cars" )

class autopart(models.Model):
    _inherit = 'product.template'
car = fields.Many2one(comodel_name="cars", store=True, string="Car", ondelete='restrict', required=False, domain="[('name','=', self.company_id.car_ids )]")

can any one help me how to define the domain filter correctly because that one give me error  Error: NameError: name 'self' is not defined