class GithubGraphqlService
    URL = "https://api.github.com/graphql".freeze
    attr_reader :access_token
    
    def initialize(access_token)
        @access_token = access_token
    end

    def client
        http_adapter ||= GraphQL::Client::HTTP.new(URL) do
          def headers(_context)
            {
              "Authorization" => "Bearer #{access_token}",  //access_token is undefined
              "User-Agent" => "Ruby"
            }
          end
        end
    
        schema ||= GraphQL::Client.load_schema(http_adapter)
        @_client ||= GraphQL::Client.new(schema:, execute: http_adapter)
   end
end

我尝试了以下修复方法，但没有任何效果。
修复：1

def client
    http_adapter ||= GraphQL::Client::HTTP.new(URL) do
      def headers(_context)
        {
          "Authorization" => "Bearer #{@access_token}",  //@access_token is nil
          "User-Agent" => "Ruby"
        }
      end
    end

    schema ||= GraphQL::Client.load_schema(http_adapter)
    @_client ||= GraphQL::Client.new(schema:, execute: http_adapter)
end

修复：2例

def client
    github_access_token = @access_token
    http_adapter ||= GraphQL::Client::HTTP.new(URL) do
      def headers(_context)
        {
          "Authorization" => "Bearer #{github_access_token}",  //github_access_token is undefined
          "User-Agent" => "Ruby"
        }
      end
    end

    schema ||= GraphQL::Client.load_schema(http_adapter)
    @_client ||= GraphQL::Client.new(schema:, execute: http_adapter)
end

headers方法定义在GraphQL::Client::HTTP类的上下文中，这意味着它不能访问GithubGraphqlService类中定义的示例变量，包括@access_token。

有没有办法访问header方法中的@access_token示例变量？
谢谢！