GraphQL Ruby订阅执行初始查询

与 GraphQL Ruby 有没有可能让GraphQL订阅在订阅时也返回解析?例如:

module Types
  class SampleType < GraphQL::Schema::Object
    field :greeting, String, null: false

    def greeting
     'Howdy!'
    end
  end
end

class SampleSchema < GraphQL::Schema
  subscription Types::SampleType
  query Types::SampleType
end

SampleSchema.execute('subscription greeting { greeting }')['data'] # nil - but want the same as query
SampleSchema.execute('query greeting { greeting }')['data'] # { greeting: 'Howdy!' }

注意:你找到了这个 Subscription Type