Database migrations are the tricky part of any deployment. They make zero-time deploys problematic. They requires special attention since they can break stuff. Some might choose to run migrations automatically, some of us run them manually. But one thing is almost always true; the production code without migrations should not ever run. So how not to run your code without doing migrations first?
PDF should be this nice universal format that many government institution now work with. But what if they require you to fill in XFA forms inside their template PDFs? The ones I need to fill for my insurance company are certainly not supported in the standard Document Viewer shipped with Fedora. This weekend I tried installing Master PDF Editor and guess what? It works like a charm for me. They even offer various RPM builds for CentOS 6/7. And they work on my Fedora out of the box. Lucky me. Thanks a lot for this!
Are you a freelancer? You don’t need to leave your command line to create invoices for your clients. InvoicePrinter is a Ruby library for producing PDF invoices without too much hassle. If you haven’t seen it before, you can read more about it in the announcement or its GitHub page. With the upcoming 1.1.0 release (currently as release candidate) a command line executable is included so you can now use command line to invoice your clients. No need to learn Ruby, just pass the data in the familiar JSON format! Here is how to create your first invoices.
Refinements is a Ruby 2.0 answer to monkey patches that can take control of your program without you realizing it. Next time you will be tempted to monkey patch something, think twice and consider using refinements.
At work we use ActiveModel::Serializer to serialize ActiveRecord objects into JSON:API-like responses for our APIs. The problem is that ActiveModel::Serializer is clever enough to dasherize our hash keys (so they can be accessed as properties instead of  brackets syntax) and our hash keys are actually real keys that we have to serve untouched.