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The Passport and ID Number name must be unique for each country using api constrints, can you help me to solve this

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@api.constrains('cpr','nationality')
def check_unique(self):
for record in self:
obj = self.search([('cpr','=',record.cpr),('id','!=',record.id)])
if obj:
raise ValidationError("The Passport and ID Number name must be unique for each country")