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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Validating Your Data
We’ve completed the first step of making a change to the database, and we have a Changeset struct with the changes we want to apply. But before we send it off to the database, we want to make sure that the data we’ve got is correct. Ecto provides two tools to help us check the integrity of our data: validations and constraints. They perform similar functions, but differ in the way that they’re implemented. We’ll explore each of them in the rest of this section.
Working with Validations
Validations are utility functions provided by the Ecto.Changeset module to help check the integrity of your data. If you look at the module documentation, the validation functions are easy to spot because they all start with validate_:
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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.