August 2025
Intermediate to advanced
294 pages
6h 59m
English
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No DB field? No Problems, with Calculations
Calculations[55] are an awesome way of defining a special type of attribute that isn’t stored in your database but is calculated on demand from other information, like a virtual field. You can use data from related resources, from files on the filesystem, from external sources, or even use just some way of tweaking, deriving, or reformatting data you already store for that resource. Calculations have to be specifically loaded when reading data, the same way you load a relationship; but once they’re loaded, they can be treated like any other attribute of a resource.
Calculating Data with Style
Let’s say we wanted to display how many years ago each album was released on an artist’s profile page. That’ll ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.