cancancan | The authorization Gem for Ruby on Rails | Authorization library

I'm seeing the following error it only is appearing in cron jobs using the whenever gem. The application is working correctly otherwise. The scheduled job doesn't run. But I can run it manually and it does work.

In a Rails 5 application, I have a shortlist model in a HABTM relationship with a user model, with the users controlled by Devise. This is all working as expected, where each User can see their own Shortlists (only).

controller.rb

I read somewhere using Rolify/Devise/Cancancan was a better alternative to configuring two devise models with login functionality (using one login page instead of two) and their respective associations between other models. I'm confused as to how to set roles within and still use associations. For instance:

If I had used two Devise models they would have just been...

I have the user table (created by devise), I added a role column, which can be: admin, manager and agent. And in user.rb I put an ENUM like this:

Im running ruby version 2.6.1 with docker. Rake gem is version 13.0.1.
Whenever I tried docker-compose up, it always fails and throws this error everytime:
This error did not exist before.

I need to upload external directory references (json file) to my users data. It's a good opportunity to learn how to create an API and use cURL, but I still meet at least one issue.

I start with a single element, but I plan to pass a json data file at the end of the story. Typical elements to load look like this:

{"name": "Test", "id": "35", "external_id": "X-001"}

I went through the cURL manual and several StackOverflow posts to finally build this API:

Created a dedicated route in routes.rb

Background: 'Add User' portion of an app works perfectly on two separate development machines, running two different OSes: Dev Machine 1 is a Mac running Catalina (10.15), Dev machine 2 is running an Ubuntu derivative (Pop!_OS 19.10). After pushing to a Digital Ocean Dokku server the 'Add User' functionality fails without error; hitting the submit button does nothing. 'Edit User' works in production, as well as dev.

The code is being managed via git, with no complications on that part. Therefore, the identical code is on three machines.

I rely on Devise for my user setup; however, skip registrations in order to restrict the public from creating an account. Instead I rely on cancancan with a role to create users. This all works in development, but I cannot see a proper error in production, it simply does a render :action => :new with no explicit error. I use Dokku, Rails 6.03 with Ruby Version 2.7.1

Development Log

After upgrading my application from rails 5.2 to rails 6 and I am getting this issue

This model adapter does not support fetching records from the database.