I using Odoo14,

I create a new custom model that inherit email field from res.partner, and want to make email for each of my users which is students be unique.

Here is my snipet of code:

class AqurStudent(models.Model):
    _name = "aqur.student"
    _description = "AQUR Student"
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _inherits = {"res.partner": "partner_id"}
    partner_id = fields.Many2one('res.partner', 'Partner', required=True, ondelete="cascade")
    
    @api.constrains('email')
    def _check_email(self):
        for record in self:
            if record.email == record.email:
                raise ValidationError('The email already registered, please use another email!')

        res_partner = self.env['res.partner'].search_count([('email', '=', self.email)])
        if len(res_partner) > 1:
            raise ValidationError('The email already registered, please use another email!')

    _sql_constraints = [
        ('email_key', 'UNIQUE (email)', 'The email already registered, please use another email!')
    ]

So,  whats  wrong  with  my  code  above?

Please,  any  help,  source  or  tutorial  how  to  face  this  will  be  very  thanks,

Thanks,

Tri  Nanda