Custom clientMutationId directives in GraphQL-Ruby

custom_client_mutation_id.rb

require "bundler/inline"

gemfile do
  gem "graphql", "2.2.6"
end

class MySchema < GraphQL::Schema
  class Undocumented < GraphQL::Schema::Directive
    locations(FIELD_DEFINITION, INPUT_FIELD_DEFINITION)
    description "This should be removed our generated docs"
  end

  class BaseMutation < GraphQL::Schema::RelayClassicMutation
    # Copied from RelayClassicMutation, with a directive:
    argument :client_mutation_id, String, "A unique identifier for the client performing the mutation.", required: false,
      directives: { Undocumented => {} }

    # The payload should always include this field
    field(:client_mutation_id, String, "A unique identifier for the client performing the mutation.", directives: { Undocumented => {} })
  end

  class DoSomething < BaseMutation
    argument :left, Int
    argument :right, Int

    field :sum, Int

    def resolve(left:, right:)
      {
        sum: left + right,
      }
    end
  end

  class Mutation < GraphQL::Schema::Object
    field :do_something, mutation: DoSomething
  end

  mutation(Mutation)
end

pp MySchema.execute("mutation { doSomething(input: { left: 1, right: 2 }) { sum } }").to_h
# {"data"=>{"doSomething"=>{"sum"=>3}}}

puts MySchema.to_definition

# """
# This should be removed our generated docs
# """
# directive @undocumented on FIELD_DEFINITION | INPUT_FIELD_DEFINITION

# """
# Autogenerated input type of DoSomething
# """
# input DoSomethingInput {
#   """
#   A unique identifier for the client performing the mutation.
#   """
#   clientMutationId: String @undocumented
#   left: Int!
#   right: Int!
# }

# """
# Autogenerated return type of DoSomething.
# """
# type DoSomethingPayload {
#   """
#   A unique identifier for the client performing the mutation.
#   """
#   clientMutationId: String @undocumented
#   sum: Int
# }

# type Mutation {
#   doSomething(
#     """
#     Parameters for DoSomething
#     """
#     input: DoSomethingInput!
#   ): DoSomethingPayload
# }