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README.md

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+# Appointment Capacity Extension
+
+This module extends the appointment capacity limit in Odoo to use the total capacity of all resources assigned to an appointment type instead of the hardcoded limit of 12 people.
+
+## Functionality
+
+- Removes the hardcoded 12-person limit for appointment bookings
+- Sets the maximum capacity based on the total capacity of all resources assigned to an appointment type
+- Works with resource-based appointment types that have the "Manage Capacities" option enabled
+
+## Installation
+
+1. Copy the `appointment_capacity_extend` folder to your Odoo custom addons directory
+2. Update the Odoo apps list
+3. Install the "Appointment Capacity Extension" module
+
+## Configuration
+
+No additional configuration is required. The module automatically extends the capacity limit based on the total capacity of resources assigned to each appointment type.
+
+## Usage
+
+1. Create or edit an appointment type
+2. Assign resources with capacities to the appointment type
+3. Enable the "Manage Capacities" option
+4. The maximum capacity for bookings will automatically be set to the total capacity of all assigned resources
+
+## Technical Details
+
+The module overrides the `_prepare_appointment_type_page_values` method in the appointment controller to modify the `max_capacity` value that is passed to the frontend template. It also includes a JavaScript extension to handle capacity selection in the frontend.
+
+## Limitations
+
+- Only works with resource-based appointment types (not user-based)
+- Requires the "Manage Capacities" option to be enabled on the appointment type

__init__.py

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+# -*- coding: utf-8 -*-
+from . import controllers

__manifest__.py

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+# -*- coding: utf-8 -*-
+{
+    'name': 'Appointment Capacity Extension',
+    "author": "Suheardy Yacob",
+    'summary': 'Extends appointment capacity based on resource total capacity',
+    'description': """
+        This module extends the appointment capacity limit to use the total capacity 
+        of all resources assigned to an appointment type instead of the hardcoded limit of 12 people.
+    """,
+    'version': '1.0',
+    'category': 'Productivity',
+    'depends': ['appointment'],
+    'data': [
+        'views/appointment_templates.xml',
+    ],
+    'assets': {
+        'web.assets_frontend': [
+            'appointment_capacity_extend/static/src/js/appointment_capacity_extend.js',
+        ],
+    },
+    'installable': True,
+    'application': False,
+    'auto_install': False,
+    'license': 'OEEL-1',
+}

controllers/__init__.py

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+# -*- coding: utf-8 -*-
+from . import main

controllers/main.py

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+# -*- coding: utf-8 -*-
+import json
+
+from odoo import http
+from odoo.http import request
+from odoo.addons.appointment.controllers.appointment import AppointmentController
+
+
+class AppointmentCapacityExtendController(AppointmentController):
+
+    def _prepare_appointment_type_page_values(self, appointment_type, staff_user_id=False, resource_selected_id=False, **kwargs):
+        """ Override to extend the max capacity based on total resource capacity """
+        values = super()._prepare_appointment_type_page_values(appointment_type, staff_user_id, resource_selected_id, **kwargs)
+        
+        # For resource-based appointments, use the total capacity of all resources
+        if appointment_type.schedule_based_on == 'resources':
+            # Get the total capacity of all resources assigned to this appointment type
+            total_capacity = appointment_type.resource_total_capacity
+            # Override the max_capacity to use the total resource capacity instead of the hardcoded 12
+            values['max_capacity'] = max(1, total_capacity)  # Ensure at least 1
+        # For user-based appointments, keep the default behavior or implement a different logic if needed
+        
+        return values

static/src/js/appointment_capacity_extend.js

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+/** @odoo-module **/
+
+import publicWidget from "@web/legacy/js/public/public_widget";
+
+publicWidget.registry.appointmentSlotSelect.include({
+    /**
+     * Override to allow higher capacity values
+     */
+    _onRefresh: async function (ev) {
+        // Call the original method
+        this._super.apply(this, arguments);
+        
+        // Additional logic for capacity extension
+        if (ev.target.id === 'resourceCapacity') {
+            const selectedCapacity = parseInt($(ev.target).val());
+            const maxCapacity = parseInt($(ev.target).data('max_capacity') || 12);
+            
+            // Allow higher capacity values based on resource total capacity
+            if (selectedCapacity > 12 && selectedCapacity <= maxCapacity) {
+                // The selection is valid, proceed with refresh
+                return;
+            }
+        }
+    },
+});

views/appointment_templates.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <template id="appointment_info_capacity_extend" inherit_id="appointment.appointment_info" name="Appointment Capacity Extension">
+        <!-- Override the capacity selection to allow higher values -->
+        <xpath expr="//select[@id='resourceCapacity']" position="attributes">
+            <attribute name="t-att-data-max_capacity">max_capacity</attribute>
+        </xpath>
+    </template>
+</odoo>