An Elixir implementation of Facebook’s GraphQL.

This is the core GraphQL query parsing and execution engine whose goal is to be transport, server and datastore agnostic.

In order to setup an HTTP server (ie Phoenix) to handle GraphQL queries you will need:

• GraphQL Plug

Examples for Phoenix can be found:

• Phoenix Examples

Here you’ll find some examples which can be used as a starting point for writing your own schemas.

Other ways of handling queries will be added in due course.

Execute a Query on the Schema

First setup your schema

iex> defmodule TestSchema do
...>   def schema do
...>     %GraphQL.Schema{
...>       query: %GraphQL.Type.ObjectType{
...>         name: "RootQueryType",
...>         fields: %{
...>           greeting: %{
...>             type: %GraphQL.Type.String{},
...>             resolve: &TestSchema.greeting/3,
...>             description: "Greeting",
...>             args: %{
...>               name: %{type: %GraphQL.Type.String{}, description: "The name of who you'd like to greet."},
...>             }
...>           }
...>         }
...>       }
...>     }
...>   end
...>   def greeting(_, %{name: name}, _), do: "Hello, #{name}!"
...>   def greeting(_, _, _), do: "Hello, world!"
...> end
...>
...> GraphQL.execute(TestSchema.schema, "{ greeting }")
{:ok, %{data: %{"greeting" => "Hello, world!"}}}
...>
...> GraphQL.execute(TestSchema.schema, ~S[{ greeting(name: "Josh") }])
{:ok, %{data: %{"greeting" => "Hello, Josh!"}}}