Ash.Api.Dsl (ash v1.51.2) View Source

A small DSL for declaring APIs

Apis are the entrypoints for working with your resources.

Apis may optionally include a list of resources, in which case they can be used as an Ash.Registry in various places. This is for backwards compatibility, but if at all possible you should define an Ash.Registry if you are using an extension that requires a list of resources. For example, most extensions look for two application environment variables called :ash_apis and :ash_registries to find any potential registries

Table of Contents


List the resources present in this API


resources do
  resource MyApp.User
  resource MyApp.Post
  resource MyApp.Comment

  • :allow_unregistered? - This is still experimental, but will be supported if you run into any issues.
    By default, an api will only work with resources that are explicitly included in the provided registry. In order to separate your application into multiple domains, you may wish to "mix and match" your resources across contexts. Specifying this option allows you to refer to resources in different apis in your resources, and allows providing any resource to api actions (to facilitate that requirement).
    Be sure to remove the Ash.Registry.ResourceValidations extension from your registry as well. The default value is false.

  • :registry - Allows declaring that only the modules in a certain registry should be allowed to work with this Api.
    This option is ignored if any explicit resources are included in the api, so everything is either in the registry or in the api. See the docs on Ash.Registry for what the registry is used for.
    To optimize for compile times, you can place the connection from the api to the registry in application configuration.
    To accomplish this:

  1. Configure an otp_app when using your api, e.g use Ash.Api, otp_app: :my_app
  2. Add application config to set up the connection
    config :my_app, MyApp.Api,
    resources: [
     registry: MyApp.Api.Registry


A reference to a resource

Introspection Target:



resource MyApp.User
  • :resource - Required. The module of the resource