Understanding the Transient Model in Odoo

Abid Patel
08-Oct-2024 Updated : 08-Oct-2024

Discover how to use Transient Models in Odoo for temporary data storage in wizards and enhance your Odoo customization skills.

Understanding the Transient Model in Odoo

In Odoo, models play a vital role in how data is managed and processed. Among the various model types, the Transient Model stands out due to its temporary nature. A Transient Model is used to store data for a short period, usually during a session or a wizard process. Unlike standard Odoo models, data in a Transient Model is not meant to be stored permanently in the database. This blog will walk you through the concept of the Transient Model in Odoo, its usage, and how to create one.

What is a Transient Model in Odoo?

A Transient Model in Odoo is a special kind of model that holds temporary data. It is typically used for wizard interfaces, where data only needs to be stored until the operation is completed. Odoo automatically clears data from transient models after a certain period, making them ideal for use cases where persistent storage is unnecessary.

In Odoo, transient models inherit from the models.TransientModel class. This ensures that the model operates as a temporary data store and is cleared from the database after a certain time.

Use Cases for Transient Models

Some common use cases for using Transient Models in Odoo include:

  • ▹ Wizards that guide users through a series of steps to complete an action.
  • ▹ Temporary storage of configuration data during an operation.
  • ▹ Forms that need to collect data temporarily without saving it to the main database.

How to Create a Transient Model in Odoo

Creating a Transient Model in Odoo is simple. Here’s a step-by-step guide to defining a transient model using Python:

Step 1: Define the Transient Model in Python

To create a transient model, you need to define it in your custom module by inheriting from the models.TransientModel class. Below is an example:

python

from odoo import models, fields, api

class MyTransientModel(models.TransientModel):
    _name = 'my.transient.model'
    _description = 'Temporary Data Storage Model'

    name = fields.Char(string='Name')
    temporary_data = fields.Text(string='Temporary Data')

In this example, we define a transient model named my.transient.model that contains two fields: name and temporary_data. This model will store data temporarily and will not be persisted long-term in the database.

Step 2: Using the Transient Model in a Wizard

Transient models are often used in wizards. Here’s an example of how you can use the transient model in a wizard interface:

python

class MyWizard(models.TransientModel):
    _name = 'my.wizard'

    input_data = fields.Char(string='Input Data')

    def action_confirm(self):
        # Code to process the wizard's data
        print("Wizard data processed: ", self.input_data)

This example demonstrates how you can collect data in a wizard form using a transient model. The action_confirm method processes the temporary data entered by the user.

Step 3: Creating the XML View for the Wizard

After defining the model and wizard, the next step is to create the view for the wizard in XML. Here’s an example:

xml

<record id="view_my_wizard_form" model="ir.ui.view">
    <field name="name">my.wizard.form</field>
    <field name="model">my.wizard</field>
    <field name="arch" type="xml">
        <form string="My Wizard">
            <group>
                <field name="input_data"/>
            </group>
            <footer>
                <button string="Confirm" type="object" name="action_confirm" class="btn-primary"/>
                <button string="Cancel" class="btn-secondary" special="cancel"/>
            </footer>
        </form>
    </field>
</record>

This XML defines the form view for the wizard, allowing users to input data that is processed by the transient model.

Key Characteristics of Transient Models

Here are some important characteristics of Transient Models in Odoo:

  • ▹ Data stored in a transient model is temporary and usually cleared after the user’s session ends.
  • ▹ They are often used in wizard interfaces to temporarily store data between steps.
  • ▹ Unlike regular models, transient models do not create permanent records in the database.

Conclusion

The Transient Model in Odoo is a useful feature for scenarios where data only needs to be stored temporarily. It’s perfect for wizard interfaces, temporary forms, and other use cases where data persistence is not required. By using transient models, developers can create efficient and streamlined workflows that don’t clutter the database with unnecessary data.

To explore more about Odoo models and their usage, visit the Odoo blogs or explore more advanced features with Freewebsnippets.

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