[ADD] event_registration_limit: added the new module event_registratration_limit

event_registration_limit/__init__.py

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+from . import models

event_registration_limit/__manifest__.py

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+{
+    'name': "Event Registration limit",
+    'category': "Marketing/Events",
+    'summary': "Module to Limit the Number of Tickets Per Registration",
+    'depends': ['event', 'website_event'],
+    'data': [
+        'views/event_event_views.xml',
+        'views/event_registration_views.xml'
+    ],
+    'installable': True,
+    'license': "AGPL-3",
+}

event_registration_limit/models/__init__.py

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+from . import event_event

event_registration_limit/models/event_event.py

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+
+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+
+class Event(models.Model):
+    _inherit = "event.event"
+
+    # Event-level limit for max tickets per registration
+    default_tickets_per_registration = fields.Integer(
+        string="Default Tickets per Registration",
+        help="Maximum number of tickets that can be booked in a single registration for this event.",
+        default=9
+    )
+
+    @api.constrains("default_tickets_per_registration")
+    def _check_ticket_limit(self):
+        for event in self:
+            if event.default_tickets_per_registration < 0:
+                raise ValidationError(
+                    "Default tickets per registration must be greater than 0."
+                )

event_registration_limit/views/event_event_views.xml

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+<?xml version="1.0"?>
+<odoo>
+    <!-- Inherit Event form to add default_tickets_per_registration -->
+    <record id="event_event_view_form_from_event_inherited" model="ir.ui.view">
+        <field name="name">event.event.view.form.from.event.inherit</field>
+        <field name="model">event.event</field>
+        <field name="inherit_id" ref="event.view_event_form"/>
+        <field name="arch" type="xml">
+            <!-- Insert after the address field -->
+            <xpath expr="//group[@name='right_event_details']/field[@name='address_id']" position="after">
+                <field name="default_tickets_per_registration"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>

event_registration_limit/views/event_registration_views.xml

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+<?xml version="1.0"?>
+<odoo>
+    <data>
+        <template id="modal_ticket_registration" name="Modal for tickets registration" inherit_id="website_event.modal_ticket_registration">
+
+            <!-- seats_max_ticket -->
+            <xpath expr="//t[@t-set='seats_max_ticket']" position="replace">
+                <t t-set="seats_max_ticket" t-value="
+                    min(
+                        ticket.seats_available if ticket and ticket.seats_limited and ticket.seats_available else event.default_tickets_per_registration,
+                        event.default_tickets_per_registration
+                    )
+                "/>
+            </xpath>
+
+            <!-- seats_max_event -->
+            <xpath expr="//t[@t-set='seats_max_event']" position="replace">
+                <t t-set="seats_max_event" t-value="
+                    min(
+                        event.seats_available if event.seats_limited and event.seats_available else event.default_tickets_per_registration,
+                        event.default_tickets_per_registration
+                    )
+                "/>
+            </xpath>
+
+            <!-- ticket dropdown -->
+            <xpath expr="//div[contains(@class, 'o_wevent_registration_single_select')]" position="replace">
+                <div class="o_wevent_registration_single_select w-auto ms-auto">
+                    <t t-if="event.seats_limited and event.seats_max == 0">
+                        <div class="text-danger">No Tickets Available</div>
+                    </t>
+                    <t t-else="">
+                        <select t-att-name="'nb_register-%s' % (tickets.id if tickets else 0)" class="d-inline w-auto form-select">
+                            <t t-set="seats_max" t-value="
+                                min(
+                                    (tickets.seats_available if tickets and tickets.seats_limited else event.default_tickets_per_registration),
+                                    event.default_tickets_per_registration
+                                )
+                            "/>
+                            <t t-foreach="range(1, seats_max + 1)" t-as="nb">
+                                <option t-out="nb" t-att-selected="nb == 1 and 'selected'"/>
+                            </t>
+                        </select>
+                    </t>
+                </div>
+            </xpath>
+
+        </template>
+    </data>
+</odoo>