[FIX] event: fix event creation with demo tickets

PURPOSE

Prepare Event Online support by providing fixes and preparatory cleaning
commits.

SPECIFICATION

Currently tickets demo data are not correctly created as they mess up with
automatic ticket computation from event_type configuration.

Solution is to flush event creation. It means tickets default configuration
is computed. Afterwards tickets are created in demo and avoid clashing with
the compute in cache.

LINKS

Task ID 2289148 (Event Bugprovements)
Prepares Task ID 2252655 (master Online Event task)
Prepares Task ID 2283796 (Event B2Basics)
PR #53944

X-original-commit: 6b5ec74b3d9bc008c95a92e7fa954675ae506d1a

addons/event/data/event_demo.xml

@@ -82,7 +82,6 @@
         <field name="event_type_id" ref="event_type_0"/>
         <field name="stage_id" ref="event_stage_booked"/>
         <field name="tag_ids" eval="[(4, ref('event.event_tag_category_1_tag_1')), (4, ref('event.event_tag_category_2_tag_1'))]"/>
-        <field name="event_ticket_ids" eval="False"/>
     </record>
     <record id="event_0_ticket_0" model="event.event.ticket">
         <field name="name">Free</field>
@@ -173,7 +172,6 @@
         <field name="seats_max">200</field>
         <field name="stage_id" ref="event_stage_booked"/>
         <field name="tag_ids" eval="[(4, ref('event.event_tag_category_1_tag_4')), (4, ref('event.event_tag_category_2_tag_1'))]"/>
-        <field name="event_ticket_ids" eval="False"/>
     </record>
     <record id="event_2_ticket_1" model="event.event.ticket">
         <field name="name">Standard</field>
@@ -210,7 +208,6 @@
         <field name="address_id" ref="event.res_partner_location_1"/>
         <field name="stage_id" ref="event_stage_announced"/>
         <field name="tag_ids" eval="[(4, ref('event.event_tag_category_1_tag_3')), (4, ref('event.event_tag_category_2_tag_2'))]"/>
-        <field name="event_ticket_ids" eval="False"/>
     </record>
     <record id="event_3_ticket_0" model="event.event.ticket">
         <field name="name">Standard</field>
@@ -252,7 +249,6 @@
         <field name="stage_id" ref="event_stage_done"/>
         <field name="kanban_state">done</field>
         <field name="tag_ids" eval="[(4, ref('event.event_tag_category_1_tag_4')), (4, ref('event.event_tag_category_2_tag_1'))]"/>
-        <field name="event_ticket_ids" eval="False"/>
     </record>
     <record id="event_4_ticket_0" model="event.event.ticket">
         <field name="name">General Admission</field>

addons/event/models/event_event.py

@@ -483,6 +483,7 @@ class EventEvent(models.Model):
         res = super(EventEvent, self).create(vals)
         if res.organizer_id:
             res.message_subscribe([res.organizer_id.id])
+        res.flush()
         return res
 
     def write(self, vals):