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: matrix_field.rb
    path of file: ./repos/push_type/core/app/fields/push_type
    
    the code of the file until where you have to start completion: module PushType
  class 
    
    def structure_class
      @structure_class ||= begin
        raise NameError unless @opts[:class]
        @opts[:class].to_s.classify.constantize
      rescue NameError
        Class.new PushType::Structure do
          define_singleton_method(:name) { "PushType::Structure" }
        end
      end