April 2019
Beginner to intermediate
244 pages
6h 34m
English
Content preview from Programming EctoBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Changing Data and Table Structure Together
Our new compositions table is working better now that we’ve added some indexes, but as we start adding data, we discover another problem. Our current structure only allows us to associate one composer with each record, and some songs have more than one composer. As we think about it further, we realize that many songs have separate composers and lyricists, and we might want to capture that info as well.
This sounds like a job for a many-to-many relationship between compositions and artists: a composition can have many artists, and an artist can contribute to many songs. As we discussed in Chapter 3, Connecting Your Tables to Elixir Structs with Schemas we’ll need a new join table between compositions ...
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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.