The Drupal 8 REST module provides a useful framework that allows you to quickly set up REST resources for your Drupal CMS. As decoupled approaches like mobile and Javascript apps continue to rise in popularity, it will become increasingly important for both backend and frontend developers to gain familiarity with the Drupal REST module and some of its quirks.
Right now there are a number of articles that go over REST basics:
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Drupalize.me – Introduction to RESTful webservices – this is probably the best “Hello World” article out there for the REST module.
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I like How to create Custom Rest Resources for POST methods in Drupal 8 for its custom resource tutorial, especially because it showcases the use of Drupal Console.
I’ve been working with the REST module for a little while now, and I’d like to share some insights and snippets that I’ve gathered throughout the process of integrating an Angular web app with feeds powered by the REST module.
1 – Identify/enforce patterns in your frontend and build API accordingly
This part is much more challenging than any of the technical issues I encountered. In short, if it is at all possible, wait until you have a good chunk of your frontend UX pattern space defined before trying to build your REST API. Conversely, try to structure your frontend in a component-driven way so that your API will need to be responsible for fewer “one-offs.”
Once you identify the set of UX components that need data from the API, try to identify common patterns across different components. For example, one pattern might be “information about a single node” or maybe “a list of node titles related to a single node by an entity reference.” Distinctions like these will serve well as concepts for REST resource parent classes.
Then, once you’ve got a good idea of the UX patterns that you need to support, you can choose to use default REST module endpoints, REST Views, or custom resource class trees to get the job done.
2 – Enable the CORS module
Unless you’re connecting to the Drupal REST API from pages that share its domain, you’re going to need the CORS module. Fortunately, it works, at least for relatively simple directives. For example, I added: *|http://localhost:5000 to the configuration textarea on /admin/config/services/cors, and this was sufficient for it to authorize client-side requests originating from my local frontend dev environment.
3 – Add a results count to REST views
For a pager on a decoupled app to work, you need to know the size of the result space. Otherwise, your “next” button will not appear/disappear when you need it to, which can be annoying. Unfortunately, the REST module does not have an option to send a results count along with its response. Fortunately, it is pretty simple to make it work.
To start, make sure your view is using the Full Pager. Do not use Mini Pager – it has a post-execute hook that in many cases changes the pager count statistic to “PHP_INT_MAX / 2” which is a large and silly number. The intent here was to handle situations where the query returns too many results, but I don’t think it is detecting that properly. Anyway, just use Full Pager for now because you won’t see any of the markup.
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