setting.rb

class Setting < ActiveRecord::Base
  enum type: {integer: 0, string: 1, storage: 2}
  enum_features :type
  store :value, coder: JSON
  after_find :match_types
  before_save :save_types

  validates :value, numericality: { only_integer: true }, if: 'integer?'
  validates :title, uniqueness: true

  def self.get(title)
    find_by(title: title)
  end
  {integer: '', string: '', storage: {}}
  private
    def match_types
      self.value = value[self.type.to_sym]
    end
  
  def save_types
    self.value = {integer: self.value.to_i, string: nil, storage: nil} if integer?
    self.value = {integer: nil, string: self.value.to_s, storage: nil}  if string?
    self.value = {integer: nil, string: nil, storage: self.value}  if storage? #todo check if its possible
  end
end