Feature/assign ce admin

energy_communities/models/res_partner.py

 from odoo import api, fields, models, SUPERUSER_ID
 import logging
+from odoo.exceptions import ValidationError
 
 logger = logging.getLogger(__name__)
 
@@ -19,6 +20,15 @@ class ResPartner(models.Model):
         new_partner = super(ResPartner, self).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)])
         for partner in partner_with_users: