[ADD] event_ticket_registration_limit: add ticket limits per registration

- add a new field to `event.event.ticket` as `max_tickets_per_registration`
to limit the number of tickets per registration.
- alter `event.event_event_ticket_view_tree_from_event` and
`website.website_event.modal_ticket_registration` views to add the field

task-4504632

Author: kiga-odoo

event_ticket_registration_limit/__init__.py

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+from . import models

event_ticket_registration_limit/__manifest__.py

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+{
+    'name': 'Event Ticket Registration Limit',
+    'description': 'adds a feature to restrict the maximum number of tickets per registration',
+    'category': 'Event/Event Ticket',
+    'depends': ['base', 'event', 'website_event'],
+
+    'version': '1.0',
+    'author': 'Kishan B. Gajera',
+
+    'installable': True,
+    'application': True,
+
+    'license': 'LGPL-3',
+
+    'data': [
+        'views/event_ticket_view.xml',
+        'views/modal_ticket_registration_web_view.xml',
+    ]
+}

event_ticket_registration_limit/models/__init__.py

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+from . import event_ticket

event_ticket_registration_limit/models/event_ticket.py

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+from odoo import models, fields
+
+class EventTicket(models.Model):
+    _inherit = "event.event.ticket"
+
+    max_tickets_per_registration = fields.Integer(string="Max Tickets per Registration", help="Define the maximum number of tickets that can be booked per registration.")

event_ticket_registration_limit/views/event_ticket_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="event_event_ticket_view_tree_from_event_inherited" model="ir.ui.view">
+        <field name="name">event.event.ticket.view.list.inherit</field>
+        <field name="model">event.event.ticket</field>
+        <field name="inherit_id" ref="event.event_event_ticket_view_tree_from_event"/>
+        <field name="arch" type="xml">
+            <xpath expr="//list" position="inside">
+                <field name="max_tickets_per_registration" string="Max Tickets/Registration" />
+            </xpath>
+        </field>
+    </record>
+</odoo>

event_ticket_registration_limit/views/modal_ticket_registration_web_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <template id="modal_ticket_registration" name="modal_ticket_registration" inherit_id="website_event.modal_ticket_registration">
+        <xpath expr="//div//t[@t-set='seats_max']" position="before">
+            <t t-set="seats_max_registration" t-value="(ticket.max_tickets_per_registration + 1) if ticket.max_tickets_per_registration else 10"/>
+        </xpath>
+
+        <xpath expr="//div//t[@t-set='seats_max']" position="attributes">
+            <attribute name="t-value">min(seats_max_ticket, seats_max_event, seats_max_registration)</attribute>
+        </xpath>
+
+        <xpath expr="//div[hasclass('o_wevent_registration_single_select')]//t[@t-set='seats_max']" position="before">
+            <t t-set="seats_max_registration" t-value="(tickets.max_tickets_per_registration + 1) if tickets.max_tickets_per_registration else 10"/>
+        </xpath>
+
+        <xpath expr="//div[hasclass('o_wevent_registration_single_select')]//t[@t-set='seats_max']" position="attributes">
+            <attribute name="t-value">min(seats_max_ticket, seats_max_event, seats_max_registration)</attribute>
+        </xpath>
+    </template>
+</odoo>