partner_industry_Secondary: Make api constrains multi to avoid error when create a company with 2 contacts

partner_industry_secondary/models/res_partner.py

@@ -17,7 +17,8 @@ class ResPartner(models.Model):
 
     @api.constrains('industry_id', 'secondary_industry_ids')
     def _check_industries(self):
-        if self.industry_id in self.secondary_industry_ids:
-            raise exceptions.ValidationError(
-                _('The main industry must be different '
-                  'from the secondary industries.'))
+        for partner in self:
+            if partner.industry_id in partner.secondary_industry_ids:
+                raise exceptions.ValidationError(
+                    _('The main industry must be different '
+                      'from the secondary industries.'))