GraphQL Plug

plug_graphql is a Plug integration for the GraphQL Elixir implementation of Facebook’s GraphQL.

This Plug allows you to easily mount a GraphQL endpoint in Phoenix. This example project shows you how:

• Phoenix GraphQL example project

Installation

1. Make a new Phoenix app, or add it to your existing app.

   mix phoenix.new hello_graphql
   cd hello_graphql

   git clone https://github.com/graphql-elixir/hello_graphql_phoenix

2. Add plug_graphql to your list of dependencies and applications in mix.exs and install the package with mix deps.get.

   def application do
     # Add the application to your list of applications.
     # This will ensure that it will be included in a release.
     [applications: [:logger, :plug_graphql]]
   end
   
   def deps do
     [{:plug_graphql, "~> 0.3.1"}]
   end

Usage

1. Define a simple schema in web/graphql/test_schema.ex:

   defmodule TestSchema do
     def schema do
       %GraphQL.Schema{
         query: %GraphQL.Type.ObjectType{
           name: "Hello",
           fields: %{
             greeting: %{
               type: %GraphQL.Type.String{},
               args: %{
                 name: %{
                   type: %GraphQL.Type.String{}
                 }
               },
               resolve: {TestSchema, :greeting}
             }
           }
         }
       }
     end
   
     def greeting(_, %{name: name}, _), do: "Hello, #{name}!"
     def greeting(_, _, _), do: "Hello, world!"
   end

2. Your api pipeline should have this as a minimum:

   pipeline :api do
     plug :accepts, ["json"]
   end

3. Mount the GraphQL endpoint as follows:

   scope "/api" do
     pipe_through :api
   
     forward "/", GraphQL.Plug, schema: {TestSchema, :schema}
   end

4. Start Phoenix

   mix phoenix.server

5. Open your browser to http://localhost:4000/api?query={greeting} and you should see something like this:

   {
     "data": {
       "greeting": "Hello, world!"
     }
   }

Contributions

This is pretty early days, the GraphQL Elixir ecosystem needs a lot more work to be useful.

However we can’t get there without your help, so any questions, bug reports, feedback, feature requests and/or PRs are most welcome!

Acknowledgements

Thanks and appreciation goes to the following contributors for PRs, discussions, answering many questions and providing helpful feedback:

• Daniel Neighman (https://github.com/hassox)
• Chris McCord (https://github.com/chrismccord)
• Aaron Weiker (https://github.com/aweiker)
• James Hiscock (https://github.com/bockit)

Thanks also to everyone who has submitted PRs, logged issues, given feedback or asked questions.