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By: Shafna K

How to Extend Models Using Mixin Classes in Odoo 18

Technical

In Odoo 18, mixin classes serve as a powerful mechanism for adding reusable functionality to models without direct modifications. A mixin is a specialized class that provides reusable methods, enabling developers to enhance or alter fields, methods, and behaviors in existing models without changing their underlying structure. This approach fosters cleaner code, improves maintainability, and facilitates easy reuse of components across various models. In this blog post, we will explore the concept of mixin classes and demonstrate how to effectively extend models in Odoo 18. By inheriting from a mixin, a new class can access all attributes and methods of both the model and the mixin, making mixins invaluable for developers looking to enrich existing functionalities.

What is a Mixin Class?

A mixin class is an abstract class designed to provide methods and attributes that can be utilized by other classes through inheritance. It is not intended to be instantiated directly; instead, it serves as a foundational base for extending the functionality of other classes. Typically, a mixin class includes methods or attributes that you want to add to various models, allowing for greater flexibility and reusability. For example, a mixin class might define specific fields that can be inherited and used in models that extend it, thereby enhancing their capabilities without the need for direct modifications.

Step 1: Create a Mixin Class

Let’s start by creating a mixin class that adds a method for logging activities. Here’s an example:

from odoo import models, api
import logging
_logger = logging.getLogger(__name__)
class ActivityLoggerMixin(models.AbstractModel):
    _name = 'activity.logger.mixin'
    _description = 'Activity Logger Mixin'
    @api.model
    def log_activity(self, message):
        _logger.info(message)

Step 2: Extend Existing Models with the Mixin

Now that we have our mixin class, we can extend existing models. For instance, let’s add the logging functionality to the res.partner model:

from odoo import models
class ResPartner(models.Model):
    _name = 'res.partner'
    _inherit = ['res.partner', 'activity.logger.mixin']
    def create(self, vals):
        record = super().create(vals)
        self.log_activity(f'Partner created: {record.name}')
        return record

Advantages of Using Mixin Classes

1. Reusability: Mixins can be reused across multiple models without code duplication.

2. Separation of Concerns: This approach keeps your code organized, making it easier to maintain.

3. Extensibility: It’s simple to extend or modify the functionality of your models.

Important Considerations

* Define mixin classes as abstract models using models.AbstractModel.

* Avoid instantiating mixins; they should only be used as base classes.

* Ensure that methods in your mixins do not conflict with existing methods in the models they extend.

Using mixin classes in Odoo 18 is an effective way to enhance your models while maintaining clean and manageable code. By promoting code reuse and separation of functionality, mixins help streamline your development process and ensure your application remains flexible and maintainable. Whether you’re adding logging, validation, or other features, mixin classes are a valuable tool in your Odoo development toolkit.

To read more about What is Mixin Class & How to Use Mixin Classes in Odoo 18?, refer to our blog What is Mixin Class & How to Use Mixin Classes in Odoo 18 


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