Скачать или смотреть Fixing the PG::UndefinedFunction Error in Rails: Downgrade Your Postgres Version

Encountering the `PG::UndefinedFunction` error in Ruby on Rails? Learn how to resolve this issue by downgrading your Postgres version from 14 to 13 and keep your tests running smoothly!
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Troubleshooting the PG::UndefinedFunction Error in Ruby on Rails

If you're using Ruby on Rails in conjunction with Postgres and suddenly find yourself facing the dreaded PG::UndefinedFunction: ERROR: function array_append(anyarray, anyelement) does not exist, you're not alone. This error often occurs during the execution of your tests, causing unnecessary frustration.

In this guide, we'll dive into understanding this elusive error, explore its cause, and most importantly, share a straightforward solution to help you get back on track.

Understanding the Error

The error message indicates that your application is trying to use a PostgreSQL function array_append, which does not exist or is not recognized in the version of Postgres you are currently using. Here’s what typically prompts this error:

ActiveMedian.create_function: This function call in your rails_helper.rb file may be triggering the issue during the setup of your test suite.

PostgreSQL Version: The root cause could stem from an incompatible PostgreSQL version that does not support the specific functionality your application relies on.

The Scenario

You might be running tests using GitHub workflows, and even if you've only made minor changes to your files, the tests fail due to this error. It can be baffling especially when they were functioning perfectly fine before.

Solution: Downgrade Your PostgreSQL Version

After conducting some research, it becomes clear that this error can be systematically resolved by downgrading your PostgreSQL version. Specifically, it has been discovered that the issue arises with Postgres version 14. By switching back to version 13, you can avoid this error entirely.

Step-by-Step Guide to Downgrade Postgres

Locate Your GitHub Workflow File:
Find the .github/workflows/build.yml file where your Postgres service is defined.

Update the Postgres Image Version:
Modify the Postgres image version from 14 to 13. Your service configuration should look like this:

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

Commit Your Changes:
Save the changes to your repository and push them to trigger your GitHub workflow.

Run Your Tests Again:
Once the workflow has reinitiated with the modified Postgres version, rerun your tests to confirm that the error has been resolved.

Wrapping Up

In summary, the PG::UndefinedFunction error you encountered when running tests in your Ruby on Rails application can be resolved by adjusting your PostgreSQL version. By downgrading from version 14 to 13, you can eliminate this issue and ensure smoother testing.

Remember, issues like these are common in software development; however, with a methodical approach to troubleshooting, they can often be resolved quickly. If you find yourself stuck again, don’t hesitate to consult the community or refer to this guide for help. Happy coding!