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Learn how to test Active Jo...
Setup your development environment.
Configure your production server.
Learn how to modify production to run websockets.
When things (users, jobs, etc) attempt to update the same record at the same time, we can often lose changes. Optimistic locking uses a lock version number to warn you about updating stale objects so you can handle that safely.
Race conditions can cause problems with data integrity. We can prevent these issues with Pessimistic Locking in ActiveRecord which uses database row-level locking.
Test Driven Development, or TDD, is a pretty simple process that allows you to write your code in conjunction with tests to ensure a high level of confidence and code coverage.
You can use Fixtures in Rails to create sample database records for your tests to run against. They're easy to setup and extremely quick.
Learn how to write integration tests in Rails to test controllers and actions
Testing integrations with external APIs in your Rails app can be hard. You don't know what requests are being made (or even the responses), so how can you properly mock them out? VCR to the rescue.
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