My custom module create a new products. It's logic based on eCommerce. But i want to overwrite value of field "Created by" (create_uid) - it must be equal to the name of current user on the moment of creation (user_id.partner_id.name).
How compute field only on creation?

class New(models.Model):

    _inherit = 'product.template'

    new_product = fields.Char(string='Your product')

    create_uid = fields.One2many('res.users', compute='_computed_author')

@api.multi

def _computed_author(self):

    self.create_uid = user_id.partner_id.name

    return True