# GraphQL Plug
[](https://travis-ci.org/graphql-elixir/plug_graphql)
[](https://graphql-slack.herokuapp.com/)
`plug_graphql` is a [Plug](https://github.com/elixir-lang/plug) integration for the [GraphQL Elixir](https://github.com/graphql-elixir/graphql) implementation of Facebook's GraphQL.
This [Plug](https://github.com/elixir-lang/plug) allows you to easily mount a GraphQL endpoint in Phoenix. This example project shows you how:
* [Phoenix GraphQL example project](https://github.com/graphql-elixir/hello_graphql_phoenix)
## Installation
1. Make a new Phoenix app, or add it to your existing app.
```sh
mix phoenix.new hello_graphql
cd hello_graphql
```
```sh
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`.
```elixir
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, "~> 0.2"}]
end
```
## Usage
1. Define a simple schema in `web/graphql/test_schema.ex`:
```elixir
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:
```elixir
pipeline :api do
plug :accepts, ["json"]
end
```
3. Mount the GraphQL endpoint as follows:
```elixir
scope "/api" do
pipe_through :api
forward "/", GraphQL.Plug, schema: {TestSchema, :schema}
end
```
4. Start Phoenix
```sh
mix phoenix.server
```
5. Open your browser to `http://localhost:4000/api?query={greeting}` and you should see something like this:
```json
{
"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.
