event: Limit max ticket per registration feature

event_max_ticket_per_registration/__init__.py

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+from . import models

event_max_ticket_per_registration/__manifest__.py

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+{
+    'name': "Event Limit Max tickets",
+    'version': '1.0',
+    'depends': ['website_event'],
+    'author': "Rishav Shah",
+    'category': 'events',
+    'description': """
+    Limit maximum number of tickets per registration
+    """,
+    'installable': True,
+    'application': True,
+    'license': 'LGPL-3',
+    'data': [
+        'views/event_event_views.xml',
+        'views/event_templates_page_registration.xml',
+    ],
+}

event_max_ticket_per_registration/models/__init__.py

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+from . import event_event

event_max_ticket_per_registration/models/event_event.py

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+from odoo import api, models, fields
+from odoo.exceptions import ValidationError
+
+
+class EventType(models.Model):
+    _inherit = "event.event"
+
+    has_ticket_limitation = fields.Boolean(string="Limit Tickets per Rgistration", default=False)
+    ticket_max_per_registration = fields.Integer(compute='_compute_tickets_max_per_registration',
+        readonly=False, store=True, default=0,
+        help="It will select this default maximum value when you choose number of tickets in this event registration")
+
+    @api.depends('has_ticket_limitation')
+    def _compute_tickets_max_per_registration(self):
+        for record in self:
+            if not record.has_ticket_limitation:
+                record.ticket_max_per_registration = 0
+
+    @api.constrains("ticket_max_per_registration")
+    def _set_ticket_max_per_registration(self):
+        for record in self:
+            if record.has_ticket_limitation and record.ticket_max_per_registration == 0:
+                raise ValidationError("Limit Tickets should be greater than 0")

event_max_ticket_per_registration/views/event_event_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="view_event_form_inherit" model="ir.ui.view">
+        <field name="name">event.event.form.inherit</field>
+        <field name="model">event.event</field>
+        <field name="inherit_id" ref="event.view_event_form"/> 
+        <field name="arch" type="xml">
+            <xpath expr="//group[@name='right_event_details']/div[field[@name='seats_limited']]" position="after">
+                <label for="has_ticket_limitation" string="Limit Tickets"/>
+                <div>
+                    <field name="has_ticket_limitation" string="Limit Tickets"/>
+                    <span invisible="not has_ticket_limitation" required="not has_ticket_limitation">to <field name="ticket_max_per_registration" class="oe_inline o_input_9ch"/> Tickets</span>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo>

event_max_ticket_per_registration/views/event_templates_page_registration.xml

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+<?xml version="1.0"?>
+<odoo>
+    <template id="event_tickets_limit_template" inherit_id="website_event.modal_ticket_registration">
+        <xpath expr="//div[hasclass('o_wevent_registration_single_select')]//select" position="replace">
+            <select t-att-name="'nb_register-%s' % (tickets.id if tickets else 0)" class="d-inline w-auto form-select">
+                <t t-if="event.ticket_max_per_registration">
+                    <t t-set="seats_max_ticket" t-value="(not tickets or not tickets.seats_limited or tickets.seats_available &gt; event.ticket_max_per_registration) and event.ticket_max_per_registration + 1 or tickets.seats_available + 2"/>
+                    <t t-set="seats_max_event" t-value="(not event.seats_limited or event.seats_available &gt; event.ticket_max_per_registration) and event.ticket_max_per_registration + 1 or event.seats_available + 1"/>
+                    <t t-set="seats_max" t-value="min(seats_max_ticket, seats_max_event) if tickets else seats_max_event"/>
+                </t>
+                <t t-else="">
+                    <t t-set="seats_max_ticket" t-value="(not tickets or not tickets.seats_limited or tickets.seats_available &gt; 9) and 10 or tickets.seats_available + 1"/>
+                    <t t-set="seats_max_event" t-value="(not event.seats_limited or event.seats_available &gt; 9) and 10 or event.seats_available + 1"/>
+                    <t t-set="seats_max" t-value="min(seats_max_ticket, seats_max_event) if tickets else seats_max_event"/>
+                </t>
+                <t t-foreach="range(0, seats_max)" t-as="nb">
+                    <option t-out="nb" t-att-selected="nb == 1 and 'selected'"/>
+                </t>
+            </select>
+        </xpath>
+        <xpath expr="//div[@id='o_wevent_tickets_collapse']//select" position="replace">
+            <select t-if="not ticket.is_expired and ticket.sale_available" t-attf-name="nb_register-#{ticket.id}" class="w-auto form-select">
+                <t t-if="event.ticket_max_per_registration">
+                    <t t-set="seats_max_ticket" t-value="(not ticket.seats_limited or ticket.seats_available &gt; event.ticket_max_per_registration) and event.ticket_max_per_registration + 1 or ticket.seats_available + 1"/>
+                    <t t-set="seats_max_event" t-value="(not event.seats_limited or event.seats_available &gt; event.ticket_max_per_registration) and event.ticket_max_per_registration + 1 or event.seats_available + 1"/>
+                    <t t-set="seats_max" t-value="min(seats_max_ticket, seats_max_event)"/>
+                </t>
+                <t t-else="">
+                    <t t-set="seats_max_ticket" t-value="(not ticket.seats_limited or ticket.seats_available &gt; 9) and 10 or ticket.seats_available + 1"/>
+                    <t t-set="seats_max_event" t-value="(not event.seats_limited or event.seats_available &gt; 9) and 10 or event.seats_available + 1"/>
+                    <t t-set="seats_max" t-value="min(seats_max_ticket, seats_max_event)"/>
+                </t>
+                <t t-foreach="range(0, seats_max)" t-as="nb">
+                    <option t-out="nb" t-att-selected="len(ticket) == 0 and nb == 0 and 'selected'"/>
+                </t>
+            </select>
+        </xpath>
+    </template>
+</odoo>