582 lines
51 KiB
HTML
582 lines
51 KiB
HTML
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<h1 class='h1'>Absinthe <em>cheatsheet</em></h1>
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This page is a work in progress. You can help by <a href='https://github.com/rstacruz/cheatsheets/blob/master/absinthe.md'>suggesting edits</a>!
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<div class='intro-content MarkdownBody'>
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<p><a href="http://absinthe-graphql.org/">Absinthe</a> allows you to write GraphQL servers in Elixir.</p>
|
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</div>
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<main class='post-content MarkdownBody' data-js-main-body data-js-anchors role='main'>
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<h2 id="introduction">Introduction</h2>
|
||
|
||
<h3 id="concepts">Concepts</h3>
|
||
|
||
<ul>
|
||
<li><code>Schema</code> - The root. Defines what queries you can do, and what types they return.</li>
|
||
<li><code>Resolver</code> - Functions that return data.</li>
|
||
<li><code>Type</code> - A type definition describing the shape of the data you’ll return.</li>
|
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</ul>
|
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<h3 id="plug">Plug</h3>
|
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|
||
<h4 id="webrouterex">web/router.ex</h4>
|
||
|
||
<pre data-line="4,5"><code class="language-elixir">defmodule Blog.Web.Router do
|
||
use Phoenix.Router
|
||
|
||
forward "/", Absinthe.Plug,
|
||
schema: Blog.Schema
|
||
end
|
||
</code></pre>
|
||
|
||
<p>Absinthe is a Plug, and you pass it one <strong>Schema</strong>.</p>
|
||
|
||
<p>See: <a href="http://absinthe-graphql.org/tutorial/our-first-query/">Our first query</a></p>
|
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|
||
<h2 class="-three-column" id="main-concepts">Main concepts</h2>
|
||
|
||
<h3 id="schema">Schema</h3>
|
||
|
||
<h4 id="webschemaex">web/schema.ex</h4>
|
||
|
||
<pre data-line="5,6,7,8,9,10"><code class="language-elixir">defmodule Blog.Schema do
|
||
use Absinthe.Schema
|
||
import_types Blog.Schema.Types
|
||
|
||
query do
|
||
@desc "Get a list of blog posts"
|
||
field :posts, list_of(:post) do
|
||
resolve &Blog.PostResolver.all/2
|
||
end
|
||
end
|
||
end
|
||
</code></pre>
|
||
|
||
<p>This schema will account for <code>{ posts { ··· } }</code>. It returns a <strong>Type</strong> of <code>:post</code>, and delegates to a <strong>Resolver</strong>.</p>
|
||
|
||
<h3 id="resolver">Resolver</h3>
|
||
|
||
<h4 id="webresolverspost_resolverex">web/resolvers/post_resolver.ex</h4>
|
||
|
||
<pre data-line="3"><code class="language-elixir">defmodule Blog.PostResolver do
|
||
def all(_args, _info) do
|
||
{:ok, Blog.Repo.all(Blog.Post)}
|
||
end
|
||
end
|
||
</code></pre>
|
||
|
||
<p>This is the function that the schema delegated the <code>posts</code> query to.</p>
|
||
|
||
<h3 id="type">Type</h3>
|
||
|
||
<h4 id="webschematypesex">web/schema/types.ex</h4>
|
||
|
||
<pre data-line="4,5,6,7,8,9"><code class="language-elixir">defmodule Blog.Schema.Types do
|
||
use Absinthe.Schema.Notation
|
||
|
||
@desc "A blog post"
|
||
object :post do
|
||
field :id, :id
|
||
field :title, :string
|
||
field :body, :string
|
||
end
|
||
end
|
||
</code></pre>
|
||
|
||
<p>This defines a type <code>:post</code>, which is used by the resolver.</p>
|
||
|
||
<h2 id="schema-1">Schema</h2>
|
||
|
||
<h3 id="query-arguments">Query arguments</h3>
|
||
|
||
<h4 id="graphql-query">GraphQL query</h4>
|
||
|
||
<pre><code>{ user(id: "1") { ··· } }
|
||
</code></pre>
|
||
|
||
<h4 id="webschemaex-1">web/schema.ex</h4>
|
||
|
||
<pre data-line="3"><code class="language-elixir">query do
|
||
field :user, type: :user do
|
||
arg :id, non_null(:id)
|
||
resolve &Blog.UserResolver.find/2
|
||
end
|
||
end
|
||
</code></pre>
|
||
|
||
<h4 id="resolver-1">Resolver</h4>
|
||
|
||
<pre data-line="1"><code class="language-elixir">def find(%{id: id} = args, _info) do
|
||
···
|
||
end
|
||
</code></pre>
|
||
|
||
<p>See: <a href="http://absinthe-graphql.org/tutorial/query-arguments/">Query arguments</a></p>
|
||
|
||
<h3 id="mutations">Mutations</h3>
|
||
|
||
<h4 id="graphql-query-1">GraphQL query</h4>
|
||
|
||
<pre><code>{
|
||
mutation CreatePost {
|
||
post(title: "Hello") { id }
|
||
}
|
||
}
|
||
</code></pre>
|
||
|
||
<h4 id="webschemaex-2">web/schema.ex</h4>
|
||
|
||
<pre data-line="1"><code class="language-elixir">mutation do
|
||
@desc "Create a post"
|
||
field :post, type: :post do
|
||
arg :title, non_null(:string)
|
||
resolve &Blog.PostResolver.create/2
|
||
end
|
||
end
|
||
</code></pre>
|
||
|
||
<p>See: <a href="http://absinthe-graphql.org/tutorial/mutations/">Mutations</a></p>
|
||
|
||
<h2 id="references">References</h2>
|
||
|
||
<ul>
|
||
<li><a href="http://absinthe-graphql.org/">Absinthe website</a> <em>(absinthe-graphql.org)</em></li>
|
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<li><a href="./graphql">GraphQL cheatsheet</a> <em>(devhints.io)</em></li>
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