How to Build a Custom Module in Odoo17 from Scratch

Odoo is an open source ERP software with the lots of power behind it to help businesses and developers to create custom applications that fit their needs. and One of the big strengths is the ability to create custom modules that adds the  functionality to the system without changing the core code base.

In this guide, we will explain the whole process of creating a custom module in Odoo 17 in an easy and practical way.

What is an Odoo Module?

Odoo module is an whole package that adds the new features or functionality to the system. Each module will contain:

1. Business logic using Python models
2. User interface components using XML views
3. Security and access control rules
4. Controllers for web-based features

This modular approach keeps development clean and organised easily adapted.

Prerequisites

Before starting the Odoo development, ensure the following points :

• Odoo17 is installed and running
• Python 3.10 or higher is available
• Basic understanding of Python and XML
• Access to a terminal or command line

Step 1: Create a Custom Addons Directory

Create a separate folder for the custom code that is not part of the core system:

mkdir custom_addons

Then update your Odoo configuration file (odoo.conf):

addons_path = /odoo/addons,/path/to/custom_addons

This ensures your custom modules are recognized by Odoo.

Step 2: Generate the Module Structure

Odoo provides a scaffold command to automatically generate the module structure:

./odoo-bin scaffold student_management /path/to/custom_addons

This creates a folder structure like:

student_management/
├── __init__.py
├── __manifest__.py
├── models/
├── controllers/
├── security/
├── views/

Step 3: Configure the Manifest File

The __manifest__.py file defines your module and its behavior:

{
    'name': 'Student Management',
    'version': '1.0',
    'summary': 'Manage students and courses',
    'author': 'Your Name',
    'category': 'Education',
    'depends': ['base'],
    'data': [
        'security/ir.model.access.csv',
        'views/student_views.xml',
    ],
    'installable': True,
    'application': True,
}

Key fields:

• depends: Required modules
• data: Files to load
• application: Displays the module as a main app

Step 4: Create a Models (Business Logic)

Inside models/student.py, define your data structure:

from odoo import models, fields

class Student(models.Model):
    _name = 'student.student'
    _description = 'Student'

    name = fields.Char(string="Name", required=True)
    age = fields.Integer(string="Age")
    email = fields.Char(string="Email")
    course_id = fields.Many2one('student.course', string="Course")

class Course(models.Model):
    _name = 'student.course'
    _description = 'Course'

    name = fields.Char(string="Course Name", required=True)
    duration = fields.Integer(string="Duration (months)")

These models define how data is stored and related.

Step 5: Define Access Rights

Create a security file (ir.model.access.csv) to control user permissions:

id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
access_student,access_student,model_student_student,,1,1,1,1
access_course,access_course,model_student_course,,1,1,1,1

This ensures users can access and manage the data correctly.

Step 6: Create Views (User Interface)

Define how data appears in the UI using XML (student_views.xml):

• Tree views (list view)
• Form views (detailed view)
• Menu items and actions

These components connect your models to the user interface.

Step 7: Run and Install the Module

Once development is complete:

1. Restart Odoo
2. Enable Developer Mode
3. Update the Apps list
4. Install the Student Management module

Your custom module should now be live inside Odoo.

Common Errors and Fixes

Issue	Possible Cause
Model not visible	Missing import or incorrect model name
Access denied	Incorrect permissions in CSV file
View not loading	XML syntax errors
Menu not showing	Wrong parent or action configuration

Menu not showing Wrong parent or action configuration

Creating a custom module in Odoo 17 involves a structured process:

• Organizing your module correctly
• Defining models for business logic
• Building views for user interaction
• Managing access permissions
• Integrating everything into the Odoo interface

Once you understand this workflow, you can build scalable and maintainable business applications tailored to any industry requirement.

For more details and custom Odoo module development. contact us