
Learn how to set an inverse function for computed fields in Odoo, allowing changes to be reflected back to the source data.
In Odoo, computed fields are powerful tools that allow you to dynamically calculate values based on other fields. However, sometimes you may need to modify the values of these computed fields. This is where setting an inverse function comes into play. An inverse function allows users to update the computed field and have that change reflected in the underlying data model. In this blog, we will discuss how to set an inverse function for a computed field in Odoo.
An inverse function is a method that allows you to define how the computed field should behave when a user modifies its value. When the inverse function is set, it enables the system to save the changes made to the computed field back to the original fields that affect its computation. This feature is especially useful in cases where you want to maintain a two-way link between a computed field and its source data.
To illustrate how to set an inverse function, let’s consider a simple example where we have a model with a computed field that aggregates values from two other fields.
from odoo import models, fields, api
class MyModel(models.Model):
_name = 'my.model'
field1 = fields.Float("Field 1")
field2 = fields.Float("Field 2")
total = fields.Float("Total", compute="_compute_total", inverse="_inverse_total")
@api.depends('field1', 'field2')
def _compute_total(self):
for record in self:
record.total = record.field1 + record.field2
In this example, we defined a model called my.model with two fields, field1 and field2, and a computed field called total. The method _compute_total calculates the total by summing field1 and field2.
def _inverse_total(self):
for record in self:
# Assuming we want to split the total equally
record.field1 = record.total / 2
record.field2 = record.total / 2
In the _inverse_total method, we define how the changes to the total field should be reflected back into field1 and field2. In this example, we split the total equally between the two fields. You can customize this logic as needed to fit your business requirements.
After defining the model and the computed field with the inverse function, you need to update the XML view to display the computed field:
<record id="view_my_model_form" model="ir.ui.view">
<field name="name">my.model.form</field>
<field name="model">my.model</field>
<field name="arch" type="xml">
<form>
<sheet>
<group>
<field name="field1"/>
<field name="field2"/>
<field name="total"/>
</group>
</sheet>
</form>
</field>
</record>
This XML code creates a form view for my.model, displaying the fields field1, field2, and total. When users change the total field, the values of field1 and field2 will be updated accordingly.
Setting an inverse function for a computed field in Odoo provides a powerful way to maintain a two-way relationship between computed fields and their source data. By following the steps outlined in this blog, you can easily implement inverse functions in your custom models, enhancing the usability and flexibility of your Odoo applications.
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