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: types.rb
    path of file: ./repos/nobrainer/lib/no_brainer/document
    
    the code of the file until where you have to start completion: module NoBrainer::Document::Types
  extend ActiveSupport::Concern

  mattr_accessor :loaded_extensions
  self.loaded_extensions = Set.new

  included { before_validation :add_type_errors }

  def add_type_errors
    return unless @pending_type_errors
    @pending_type_errors.each do |name, error|
      er
    
    def cast_user_to_model_for(attr, value)
      type = fields[attr.to_sym].try(:[], :type)
      return value if type.nil? || value.nil? ||
        value.is_a?(NoBrainer::Document::AtomicOps::PendingAtomic) ||
        value.is_a?(RethinkDB::RQL)

      if type.respond_to?(:nobrainer_cast_user_to_model)
        type.nobrainer_cast_user_to_model(value)
      else
        raise NoBrainer::Error::InvalidType unless value.is_a?(type)
        value
      end