gallery/app/models/album_image.rb

require 'net/http'
class AlbumImage 
  include Mongoid::Document
  include Mongoid::Timestamps
  include OrbitTag::Taggable
  mount_uploader :file, GalleryUploader
  field :title
  field :title_translations, type: Hash, default: {}
  field :description, type: String, localize: true, default: ""
  field :rss2_id, type: String
  field :order, type: Integer, default: -1
  belongs_to :album
  has_many :album_crops, :autosave => true, :dependent => :destroy
  accepts_nested_attributes_for :album_crops, :allow_destroy => true
  # has_and_belongs_to_many :tags, :class_name => "GalleryTag"
  index({"order" => 1}, { unique: false, background: false })
  before_create do
    tmp_album = self.album
    min_order = nil
    if tmp_album
      min_order = tmp_album.min_order
      min_order = -1 if min_order == 0
    end
    if min_order.nil?
      self.order = -Time.now.to_i
    else
      tmp_order = min_order - 1
      self.order = tmp_order
      Album.where(:id=>tmp_album.id).update_all(:min_order=>tmp_order) #present call save callback twice due to autosave
    end
    true
  end
  after_destroy do
    min_order = Album.where(:id=>self.album_id).pluck(:min_order).first
    puts "min_order: #{min_order} #{self.order}"
    if self.order == min_order
      Album.where(:id=>self.album_id).update_all(:min_order=>min_order + 1)
    end
  end
  before_save do
    if self.file_changed?
      cover = self.album['cover']
      if cover && cover == self.id
        self.album.update_attributes({:cover_path => self.file.thumb.url, :cover=> self.id})
      end
    end
  end
  def title_translations
    tmp = super || {}
    if tmp == {}
      tmp = I18n.available_locales.collect{|locale| [locale,self[:title]]}.to_h
    end
    tmp
  end
  def title
    self.title_translations[I18n.locale]
  end
end