Adds optional use of notes records

Adds use of description and author from notes table if data-migration is done, otherwise use body and author from note's first comment. Decision procedure "data-migration is done" is defined with "is user_ip or user_id not nil?". If author is deleted, "deleted" is displayed.

Author: nenad-vujicic

app/models/note.rb

@@ -28,6 +28,8 @@
 class Note < ApplicationRecord
   include GeoRecord
 
+  belongs_to :author, :class_name => "User", :foreign_key => "user_id", :optional => true
+
   has_many :comments, -> { left_joins(:author).where(:visible => true, :users => { :status => [nil, "active", "confirmed"] }).order(:created_at) }, :class_name => "NoteComment", :foreign_key => :note_id
   has_many :all_comments, -> { left_joins(:author).order(:created_at) }, :class_name => "NoteComment", :foreign_key => :note_id, :inverse_of => :note
   has_many :subscriptions, :class_name => "NoteSubscription"
@@ -89,24 +91,27 @@ def freshly_closed_until
     closed_at + DEFAULT_FRESHLY_CLOSED_LIMIT
   end
 
-  # Return the note's description, derived from the first comment
+  # Return the note's description, unless record is unavailable and
+  # it will be derived from the first comment. If note's author is
+  # deleted, "deleted" will be returned
   def description
-    comments.first.body
+    if !author.nil? && author.status == "deleted"
+      RichText.new("text", I18n.t("notes.show.description_when_author_is_deleted"))
+    elsif user_ip.nil? && user_id.nil?
+      comments.first.body
+    else
+      RichText.new("text", self[:description])
+    end
   end
 
-  # Return the note's author object, derived from the first comment
+  # Return the note's author object, unless record is unavailable and
+  # it will be derived from the first comment
   def author
-    comments.first.author
-  end
-
-  # Return the note's author ID, derived from the first comment
-  def author_id
-    comments.first.author_id
-  end
-
-  # Return the note's author IP address, derived from the first comment
-  def author_ip
-    comments.first.author_ip
+    if user_ip.nil? && user_id.nil?
+      all_comments.first.author
+    else
+      self[:author]
+    end
   end
 
   private

config/locales/en.yml

@@ -3061,6 +3061,7 @@ en:
       open_title: "Unresolved note #%{note_name}"
       closed_title: "Resolved note #%{note_name}"
       hidden_title: "Hidden note #%{note_name}"
+      description_when_author_is_deleted: "deleted"
       event_opened_by_html: "Created by %{user} %{time_ago}"
       event_opened_by_anonymous_html: "Created by anonymous %{time_ago}"
       event_commented_by_html: "Comment from %{user} %{time_ago}"