How to Create a Dynamic Selection Field in Odoo

Learn how to create a dynamic selection field in Odoo, complete with explanations and examples to solve common issues you'll encounter.
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Introduction

Creating a dynamic selection field in Odoo can significantly enhance user experience by making forms responsive to user inputs. However, many developers face challenges when implementing this feature. If you are looking to create a dynamic selection field that alters its options based on specific conditions, you've come to the right place!

The Challenge

You may have a scenario where the options in a selection field need to be adjusted based on another field's value. For instance, you might want to change the choices available in a Material Orientation field depending on whether the customer’s order unit is in 'sheets' or 'yards'. Here's a code snippet that illustrates the initial attempt:

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While the intention behind this code is correct, it doesn't work as expected because of the timing of when the method is called in relation to the record's data being loaded.

Solution

To solve this issue, we need to take into account the timing and context within which the selection field's options are generated. The key adjustments are as follows:

Understanding Timing

The _product_customer_uom_change method is invoked before the current record is fully loaded, meaning that it cannot dynamically use the current record's data (like rec.x_order_customer_uom.name) directly.

Suggested Approach

Instead of relying on the record itself, we can utilize the execution context provided by Odoo. This can be done using the self.env.context.

Revised Code Example

Here's how you can adjust your code to operate based on the context:

[[See Video to Reveal this Text or Code Snippet]]

In this code:

We retrieve the order_type directly from the context instead of trying to reference the current record.

This ensures that your selection options are correctly modified based on previous selections made within the Odoo interface.

Alternative Approach

If the contextual approach doesn’t meet your needs, consider using a many2one field with a selection widget and applying domains directly in the view. This method may provide greater flexibility and control over the displayed options based on related records.

Conclusion

Creating a dynamic selection field in Odoo can initially seem daunting, but with an understanding of the execution context and proper coding practices, it can be accomplished effectively. By adjusting your methodology to utilize self.env.context, you can ensure that your selection options dynamically respond to user choices.

By following the steps and examples outlined in this guide, you should be well-equipped to implement dynamic selection fields in your Odoo applications successfully!

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