GQL

This is a DSL for writting GraphQL syntax.

Installation

I have not posted to Rubygems yet. This is still in alpha and is currently being used to write a few small clients. If you want to use this you will have to install via git.

gem 'gql', git: 'https://github.com/wontruefree/gql.git'

And then execute:

$ bundle install

Usage

This examples will use the GraphQL starwars dataset.

Most of the Types in GraphQL can be accessed under the default GQL namespace. For a basic query you can use the query method.

Here is an example of a query for heros.

GQL.query do |q|
  q.hero do
    q.name
    q.height
    q.mass
  end
end

Here is an example of creating a type.

GQL.type :Character do |t|
  t.name String
  t.friends [:Character]
  t.homeWorld :Planet
  t.species :Species
end

Here is a mutation.

GQL.mutation do |m|
  m.CreateReviewForEpisode("$ep" => "Episode!", "$review" => "ReviewInput!") do
    m.createReview(episode: :$ep, review: :$review) do
      m.stars
      m.commentary
    end
  end
end

Creating an inline fragment.

GQL.query do |q|
  q.HeroForEpisode("$ep" => "Episode!") do
    q.hero("episode" => "$ep") do
      q.name
      q.on_Droid do
        q.primaryFunction
      end
      q.on_Human do
        q.height
      end
    end
  end
end

Metafields

GQL.query do |q|
  q.search(text: "an") do
    q.__typename
    q.on_Human do
      q.name
    end
    q.on_Droid do
      q.name
    end
    q.on_Starship do
      q.name
    end
  end
end

Advanced Features

You can register a macro to be applied to your queiries. This will expand inplace when called with a !

Here is what a macro looks like.

GQL.register(:hero) do |gql|
  gql.hero do
    gql.name
    gql.height
    gql.mass
  end
end

And here is what it looks like to call in a query.

GQL.query do |gql|
  gql.hero!
end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

License

The gem is available as open source under the terms of the MIT License.