Hi,

When syncing Google Calendar events in Odoo, unknown attendee emails often result in automatic creation of new res.partner records. If you want to avoid creating new partner records, you can override the _get_sync_partner method and change just one line.

Solution Using Inherited Model (google.calendar.sync)

Here’s the full code using model inheritance and making only one change:

from odoo import models, api

from odoo.tools.mail import email_normalize

class GoogleCalendarSync(models.AbstractModel):

    _inherit = 'google.calendar.sync'

    @api.model

    def _get_sync_partner(self, emails):

        normalized_emails = [email_normalize(contact) for contact in emails if email_normalize(contact)]

        user_partners = self.env['mail.thread']._mail_search_on_user(

            normalized_emails,

            extra_domain=[('share', '=', False)]

        )

        partners = list(user_partners)

        remaining = [email for email in normalized_emails if

                     email not in [partner.email_normalized for partner in partners]]

        if remaining:

            #Changed this line: force_create=False to avoid creating new partners

            partners += self.env['mail.thread']._mail_find_partner_from_emails(

                remaining, records=self, force_create=False

            )

        unsorted_partners = self.env['res.partner'].browse([p.id for p in partners if p.id])

        # partners need to be sorted according to the emails order provided by Google

        k = {value: idx for idx, value in enumerate(emails)}

        result = unsorted_partners.sorted(key=lambda p: k.get(p.email_normalized, -1))

        return result

Hope it helps.