Use when designing GraphQL schemas with Absinthe. Covers type definitions, interfaces, unions, enums, and schema organization patterns.
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Comprehensive guide to designing GraphQL schemas with Absinthe in Elixir.
defmodule MyApp.Schema.Types do
use Absinthe.Schema.Notation
object :user do
field :id, non_null(:id)
field :name, non_null(:string)
field :email, :string
field :posts, list_of(:post) do
resolve &MyApp.Resolvers.User.posts/3
end
field :inserted_at, :datetime
end
object :post do
field :id, non_null(:id)
field :title, non_null(:string)
field :body, :string
field :author, :user do
resolve &MyApp.Resolvers.Post.author/3
end
end
end
interface :node do
field :id, non_null(:id)
resolve_type fn
%MyApp.User{}, _ -> :user
%MyApp.Post{}, _ -> :post
_, _ -> nil
end
end
object :user do
interface :node
field :id, non_null(:id)
field :name, non_null(:string)
end
union :search_result do
types [:user, :post, :comment]
resolve_type fn
%MyApp.User{}, _ -> :user
%MyApp.Post{}, _ -> :post
%MyApp.Comment{}, _ -> :comment
_, _ -> nil
end
end
enum :post_status do
value :draft, as: "draft"
value :published, as: "published"
value :archived, as: "archived"
end
input_object :create_post_input do
field :title, non_null(:string)
field :body, :string
field :status, :post_status, default_value: :draft
end
defmodule MyApp.Schema do
use Absinthe.Schema
import_types MyApp.Schema.Types
import_types MyApp.Schema.Queries
import_types MyApp.Schema.Mutations
import_types MyApp.Schema.Subscriptions
import_types Absinthe.Type.Custom # DateTime, etc.
query do
import_fields :user_queries
import_fields :post_queries
end
mutation do
import_fields :user_mutations
import_fields :post_mutations
end
subscription do
import_fields :post_subscriptions
end
end
scalar :uuid, name: "UUID" do
serialize &to_string/1
parse &parse_uuid/1
end
defp parse_uuid(%Absinthe.Blueprint.Input.String{value: value}) do
case Ecto.UUID.cast(value) do
{:ok, uuid} -> {:ok, uuid}
:error -> :error
end
end
defp parse_uuid(_), do: :error