dry-graphql makes dry-types and dry-struct play nicely with GraphQL. It adds a graphql_type method which will automatically generate a graphql-ruby. This takes the manual work out of maintaining multiple type definitions. Specify your dry-type, and re-use it for GraphQL.

Here is an example of using it with dry-struct:

class User < Dry::Struct
  module Types
    include Dry.Types()
  end

  attribute :name, Types::Strict::String.optional
  attribute :age, Types::Coercible::Integer
  attribute :middle_name, Types::Coercible::String
end

class UserType < User.graphql_type(only: [:name, :age])
  # you can add other fields here if you want
end

class Query < GraphQL::Schema::Object
  field :user, UserType, null: false
end

class Schema < GraphQL::Schema
  query Query
end

puts schema.to_definition # =>
# type Query {
#   user: User!
# }
#
# type User {
#   age: Int!
#   name: String
# }
end

To add a graphql_type method to a ROM::Relation:

require 'dry/graphql/rom'

class Users < ROM::Relation[:sql]
  extend Dry::GraphQL::ROM
end

Add this line to your application's Gemfile:

gem 'dry-graphql'

And then execute:

$ bundle

Or install it yourself as:

$ gem install dry-graphql

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec 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.

Bug reports and pull requests are welcome on GitHub at https://github.com/adhawk/dry-graphql. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

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

Everyone interacting in the Dry::GraphQL project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.