Feature/assign ce admin

energy_communities/models/res_partner.py

 import logging
+from odoo.exceptions import ValidationError
 
 from odoo import SUPERUSER_ID, api, fields, models
 
@@ -28,6 +29,15 @@ class ResPartner(models.Model):
         new_partner = super().create(vals)
         return new_partner
 
+    @api.constrains('email')
+    def _check_email(self):
+        count_users = self.env['res.partner'].search_count([
+            ('email', '=', self.email),
+            ('user_ids', '!=', False)
+        ])
+        if self.email and count_users >= 1:
+            raise ValidationError('The email already registered, please use another email!')
+
     def cron_update_company_ids_from_user(self):
         partner_with_users = self.search(
             [("user_ids", "!=", False), ("user_ids.id", "!=", SUPERUSER_ID)]