You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: has_fields.rb
    path of file: ./repos/graphql-ruby/lib/graphql/schema/member
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module GraphQL
  class Schema
    class Member
      # Shared code for Objects, Interfaces, Mutations, Subscriptions
      module HasFields
        # Add a field to this object or interface with the given definition
        # @see {GraphQL::Schema::Field#initialize} for method signature
        # @return [GraphQL::Schema::Field]
        def field(*args, **kwargs, &block)
          field_defn = field_class.from_options(*args, owner: self, **kwargs, &block)
          add_field(field_defn)
          field_defn
        end

        # A list of Ruby keywords.
        #
       
    
          def fields(context = GraphQL::Query::NullContext.instance)
            # Objects need to check that the interface implementation is visible, too
            warden = Warden.from_context(context)
            # Local overrides take precedence over inherited fields
            visible_fields = {}
            for ancestor in ancestors
              if ancestor.respond_to?(:own_fields) && visible_interface_implementation?(ancestor, context, warden)
                ancestor.own_fields.each do |field_name, fields_entry|
                  # Choose the most local definition that passes `.visible?` --
                  # stop checking for fields by name once one has been found.
                  if !visible_fields.key?(field_name) && (f = Warden.visible_entry?(:visible_field?, fields_entry, context, warden))
                    visible_fields[field_name] = f
                  end
                end