Add artist commentary, fixes #2024

app/models/artist_commentary.rb

@@ -0,0 +1,41 @@
+class ArtistCommentary < ActiveRecord::Base
+  attr_accessible :post_id, :original_description, :original_title, :translated_description, :translated_title
+  validates_uniqueness_of :post_id
+  belongs_to :post
+  has_many :versions, :class_name => "ArtistCommentaryVersion", :foreign_key => :post_id, :primary_key => :post_id, :order => "artist_commentary_versions.id ASC"
+  after_save :create_version
+
+  def original_present?
+    original_title.present? || original_description.present?
+  end
+
+  def translated_present?
+    translated_title.present? || translated_description.present?
+  end
+
+  def any_field_present?
+    original_present? || translated_present?
+  end
+
+  def create_version
+    versions.create(
+      :post_id => post_id,
+      :original_title => original_title,
+      :original_description => original_description,
+      :translated_title => translated_title,
+      :translated_description => translated_description
+    )
+  end
+
+  def revert_to(version)
+    self.original_description = version.original_description
+    self.original_title = version.original_title
+    self.translated_description = version.translated_description
+    self.translated_title = version.translated_title
+  end
+
+  def revert_to!(version)
+    revert_to(version)
+    save!
+  end
+end