demongoize custom field on pluck

class CustomField

  attr_reader :value

  def initialize(value)

    @value = value.to_s

  end

  def to_s

    value

  end

  def as_json

    value

  end

  # Converts an object of this instance into a database friendly value.

  def mongoize

    @mongoize ||= Base64.encode64(value)

  end

  # Get the object as it was stored in the database, and instantiate

  # this custom class from it.

  def self.demongoize(object)

    self.new(Base64.decode64(object))

  end

  # Takes any possible object and converts it to how it would be

  # stored in the database.

  def self.mongoize(object)

    self.new(object).mongoize

  end

  # Converts the object that was supplied to a criteria and converts it

  # into a database friendly form.

  def self.evolve(object)

    self.new(object).mongoize

  end

end

class Report

  include Mongoid::Document

  field :my_field, type: CustomField

end

Report.delete_all

Report.create!(my_field: 'test')

my_field = Report.first.my_field

puts my_field # => expected 'test', actual 'test'

puts my_field.class # => expected CustomField, actual CustomField

my_field = Report.pluck(:my_field).first

puts my_field # => requested 'test', currently "dGVzdA=="

puts my_field.class # => requested CustomField, currently String