hi all i have model called crm.lead.extended, i want to trigger mail notification when a record is created in that , how to do that?  i want this to be done by code 

i have created some sample functions for that someone check and confirm this because iam not getting any mails when i create a record

    @ api.model

    def create (self, vals):

        rec = super (crm_extended, self) .create (vals)

        if 'opportunity_id' in vals:

            template = self.env.ref ('crm_extended.create_crm_lead_mail_template')

            for rec in self:

                template.send_mail (rec.id, force_send = True) 

        return rec

    @ api.model

    def create (self, vals):

        vals ['usage'] = 'crm.lead.extended'

        crm.lead.extended = super (crm_extended, self) .create (vals)

        self._update_cron ()

        self._update_registry ()

        return crm.lead.extended