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Learn how to prevent rendering errors in ODOO 15 templates caused by missing dictionary keys. This post provides practical solutions and code examples to ensure smooth template rendering.
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This video is based on the question https://stackoverflow.com/q/77723202/ asked by the user 'Claudiu' ( https://stackoverflow.com/u/2573075/ ) and on the answer https://stackoverflow.com/a/77731598/ provided by the user 'Yassir Irfan' ( https://stackoverflow.com/u/13541888/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Avoiding Render Errors in ODOO 15 for Missing Values

When working with ODOO 15 and custom templates, developers often encounter a common issue: the dreaded rendering error due to missing values. This can lead to a frustrating user experience and can impede the smooth functioning of your application. In this guide, we'll explore how to avoid these render errors and provide you with practical solutions to handle missing keys within your data dictionaries.

Understanding the Problem

Imagine you have created a template that fetches and displays data from a method returning a list of dictionaries. Here's a summary of the scenario that could lead to a KeyError:

Missing Key Issue: If one of your dictionaries lacks a key that you're trying to access—like 'Brouillon' in the second dictionary of your list—ODDO will raise a KeyError, halting the rendering of your template.

Example of Error:

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

Such errors can be particularly frustrating, especially when they arise unexpectedly. Thankfully, ODOO provides mechanisms to check for the existence of keys to avoid these pitfalls.

Solution Overview

The key to fixing the KeyError issue is to incorporate conditions in your template that check whether a specific key exists before trying to render its value. Here's how you can do that through simple conditionals in your template's code.

Using t-if to Check Key Existence

Incorporate conditional statements directly into your template to ensure that a key is present before attempting to access its value. Here's how you can adjust your template for the 'dsp_id' and 'Brouillon' keys:

Check for 'dsp_id':

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

Check for 'Brouillon':

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

In essence, by wrapping your access of each key within conditional checks (t-if), you ensure that the template will only attempt to render keys that are present in the current row of data. This eliminates the possibility of encountering a KeyError when rendering the template.

Complete Example

Here is what your updated template code might look like:

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

Conclusion

By implementing key existence checks directly within your ODOO 15 templates, you can confidently avoid rendering errors caused by missing values in your data dictionaries. This not only enhances the resilience of your applications but also provides a smoother experience for users. With these straightforward modifications, you can eliminate the frustration of unexpected template errors and ensure your custom templates run seamlessly.

Now, go ahead and make these adjustments to your templates, and enjoy a more robust ODOO development experience!