Resolving the Expected singleton: res.company() Error in Odoo's API

Описание: Learn how to troubleshoot and fix the "Expected singleton: res.company()" error in Odoo when using the action_post method.
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This video is based on the question https://stackoverflow.com/q/78138099/ asked by the user 'Brandon Huynh' ( https://stackoverflow.com/u/23573500/ ) and on the answer https://stackoverflow.com/a/78139121/ provided by the user 'Vinay Davda' ( https://stackoverflow.com/u/15792796/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Expected singleton: res.company() Error in Odoo

If you're developing an API using Odoo and are experiencing the Expected singleton: res.company() error, you're not alone. This error can be frustrating and time-consuming, especially when you are attempting to confirm a reversed entry for the account.move model using the action_post() method. In this guide, we'll dig into the root of the problem and guide you through a straightforward solution.

The Problem

What is the Expected singleton: res.company() Error?

The Expected singleton error occurs when a method that is expecting a single record is instead provided with zero or multiple records. In Odoo's context, this usually refers to a situation where a model (like res.company) returns either no records or more than one record when it is expecting only one.

When Does This Error Occur?

In the scenario described, the error happens during the execution of the action_post() method after reversing a specified invoice in the account.move model. Despite using action_post() successfully in other contexts (like sale.order), it fails here because of how the company context is being handled.

Code Snippet

Here's a quick look at the part of your code where the error arises:

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

Traceback Insight

The traceback indicates:

The error likely happens when the Odoo framework tries to reconcile entries related to a company.

It fails to receive a single company_id when calling methods that rely on it, which leads to the error message.

Solution: Fixing the Error

To resolve the Expected singleton: res.company() error, we need to ensure that the action_post() method operates under the correct company context. Here’s how to do that step-by-step.

Step 1: Understanding Company Context

Carefully consider how the company_id is defined and used in your code. The company_id should always point to a single company record to avoid the Expected singleton error.

Step 2: Check Your Company Records

Before calling action_post(), you should verify that there is exactly one company associated with your invoice. To do this:

Inspect the self.company_id in the stack trace.

Confirm that your self._context is set appropriately and returns one company.

Step 3: Modify Your Code

If you observe that multiple company records exist, modify your call to action_post(). Add the company context directly when you call the action_post() method:

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

This line effectively sets the company context to the correct company when processing the reversal.

Step 4: Debugging

To confirm your fixes, you might want to include debugging statements:

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

These logs will help you understand what data is being passed to the critical methods involved in the reversal process.

Conclusion

The Expected singleton: res.company() error can be resolved by ensuring that a single company_id is in use during action_post(). By using the with_company() method, we can prevent Odoo from encountering multiple records and allow it to execute the reversal process successfully. Always double-check the companies associated with your records to maintain a clean context.

By following these steps, you'll not only resolve this error but also build a deeper understanding of the Odoo environment and how its models interact with each other. Happy coding!