How To Override the Unlink Method in Odoo

Abid Patel
17-Oct-2024 Updated : 17-Oct-2024

Learn how to override the unlink method in Odoo to apply custom logic before deleting records. Prevent accidental deletion and add validation checks.

How To Override the Unlink Method in Odoo

In Odoo, the unlink method is used to delete records from the database. However, there are scenarios where you may want to restrict or add custom logic before deleting records, such as validating certain conditions or logging actions before deletion. In such cases, you can override the unlink method in Odoo. This blog will walk you through how to override the unlink method in Odoo and provide a practical example of its implementation.

Why Override the Unlink Method?

Overriding the unlink method in Odoo allows you to apply custom logic before a record is deleted. This can include validations, checking permissions, or even preventing certain records from being deleted under specific conditions. By customizing this method, you gain control over what happens when a user attempts to delete a record.

How To Override the Unlink Method in Odoo

To override the unlink method, you need to extend the model where the method should be customized and add your logic within the method. The basic structure involves checking certain conditions, raising exceptions if necessary, or logging events before calling the parent unlink method.

Example of Overriding the Unlink Method

Below is an example of how to override the unlink method for the product.template model, where products with a sale price less than a specific value are prevented from being deleted:

python
from odoo import models, api
from odoo.exceptions import ValidationError

class ProductTemplate(models.Model):
    _inherit = 'product.template'

    def unlink(self):
        for product in self:
            if product.list_price < 50:
                raise ValidationError("You cannot delete a product with a price less than 50.")
        return super(ProductTemplate, self).unlink()

In this example, the unlink method is overridden to prevent the deletion of products with a list price lower than 50. If the condition is met, a ValidationError is raised, and the record is not deleted. Otherwise, the method proceeds to call the parent unlink method, which deletes the record as usual.

Steps in Overriding the Unlink Method

  • ▹ Inherit the model where you want to override the unlink method.
  • ▹ Define your custom logic within the method to check conditions or apply restrictions.
  • ▹ Raise an exception if the condition for deletion is not met.
  • ▹ Call the parent unlink method using super() to delete the record if all conditions are satisfied.

Why Use Custom Unlink Logic?

Overriding the unlink method provides multiple benefits:

  • Control: You can prevent important records from being deleted by accident.
  • Validation: Ensure that specific conditions are met before allowing a record to be deleted.
  • Security: Add permission checks to ensure only authorized users can delete records.

Handling Complex Logic

If you need to handle more complex deletion logic, such as deleting related records or logging actions, you can extend the unlink method further. For instance, you can log the deletion event or trigger additional actions after a record is deleted.

python
def unlink(self):
    for record in self:
        # Custom logic before deletion
        _logger.info(f"Record {record.name} is being deleted.")
    return super(ModelName, self).unlink()

Conclusion

Overriding the unlink method in Odoo is a powerful way to control how records are deleted in the system. Whether you need to apply specific validation rules, prevent accidental deletions, or track deletion events, customizing the unlink method gives you flexibility and control. By applying the right logic, you can ensure that data is handled securely and in line with your business requirements.

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