August 2025
Intermediate to advanced
294 pages
6h 59m
English
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Introducing Policies
Policies define who has access to resources within our app and what actions they can run. Each resource can have its own set of policies, and each policy can apply to one or more actions defined in that resource.
Policies are checked internally by Ash before any action is run. If all policies that apply to a given action pass (return authorized), then the action is run. If one or more of the policies fail (return unauthorized), then the action is not run and an error is returned.
Because policies are part of resource definitions, they’re automatically checked on all calls to actions in those resources. Write them once, and they’ll apply everywhere: in our web UI, our REST and GraphQL APIs, an iex REPL, and any other interfaces ...
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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.