* Denormalized post versions. Testing has shown it reduces the size

of the table 66%.

app/logical/date_tag.rb

@@ -34,7 +34,7 @@ class DateTag
   end
   
   def next_week
-    DateTag.new_from_range(1.week.since(start_date)), 1.week.since(end_date)
+    DateTag.new_from_range(1.week.since(start_date), 1.week.since(end_date))
   end
   
   def previous_month
@@ -42,7 +42,7 @@ class DateTag
   end
   
   def next_month
-    DateTag.new_from_range(1.month.since(start_date)), 1.month.since(end_date)
+    DateTag.new_from_range(1.month.since(start_date), 1.month.since(end_date))
   end
   
   def date

app/models/post.rb

@@ -1,7 +1,7 @@
 class Post < ActiveRecord::Base
   attr_accessor :old_tag_string, :old_parent_id
   after_destroy :delete_files
-  after_save :create_version  
+  after_save :update_history
   after_save :update_parent_on_save
   before_save :merge_old_tags
   before_save :normalize_tags
@@ -15,7 +15,7 @@ class Post < ActiveRecord::Base
   has_one :unapproval, :dependent => :destroy
   has_one :upload, :dependent => :destroy
   has_one :moderation_detail, :class_name => "PostModerationDetail", :dependent => :destroy
-  has_many :versions, :class_name => "PostVersion", :dependent => :destroy  
+  has_one :history, :class_name => "PostHistory"
   has_many :votes, :class_name => "PostVote", :dependent => :destroy
   has_many :notes, :dependent => :destroy
   has_many :comments
@@ -233,24 +233,21 @@ class Post < ActiveRecord::Base
     end
   end
   
-  module VersionMethods
-    def create_version
-      version = versions.create(
-        :source => source,
-        :rating => rating,
-        :tag_string => tag_string,
-        :updater_id => CurrentUser.user.id,
-        :updater_ip_addr => CurrentUser.ip_addr
-      )
-    
-      raise PostVersion::Error.new(version.errors.full_messages.join("; ")) if version.errors.any?
+  module HistoryMethods
+    def revisions
+      if history.nil?
+        update_history
+      end
+      
+      history.revisions
     end
     
-    def revert_to!(version)
-      self.source = version.source
-      self.rating = version.rating
-      self.tag_string = version.tag_string
-      save!
+    def update_history
+      if history.nil?
+        create_history
+      end
+
+      history << self
     end
   end
   
@@ -788,7 +785,7 @@ class Post < ActiveRecord::Base
   include ImageMethods
   include ApprovalMethods
   include PresenterMethods
-  include VersionMethods
+  include HistoryMethods
   include TagMethods
   include FavoriteMethods
   include UploaderMethods

app/models/post_history.rb

@@ -0,0 +1,40 @@
+class PostHistory < ActiveRecord::Base
+  class Error < Exception ; end
+
+  before_validation :initialize_revisions, :on => :create
+  belongs_to :post
+  
+  def self.build_revision_for_post(post)
+    hash = {
+      :source => post.source,
+      :rating => post.rating,
+      :tag_string => post.tag_string,
+      :parent_id => post.parent_id,
+      :user_id => CurrentUser.id,
+      :ip_addr => CurrentUser.ip_addr,
+      :updated_at => revision_time
+    }
+  end
+  
+  def self.revision_time
+    Time.now
+  end
+  
+  def initialize_revisions
+    write_attribute(:revisions, "[]")
+  end
+  
+  def revisions
+    if read_attribute(:revisions).blank?
+      []
+    else
+      JSON.parse(read_attribute(:revisions))
+    end
+  end
+  
+  def <<(post)
+    revision = self.class.build_revision_for_post(post)
+    write_attribute(:revisions, (revisions << revision).to_json)
+    save
+  end
+end

app/models/post_version.rb

@@ -1,6 +0,0 @@
-class PostVersion < ActiveRecord::Base
-  class Error < Exception ; end
-  
-  validates_presence_of :updater_id, :updater_ip_addr
-  belongs_to :post
-end

app/views/artists/_search.html.erb

@@ -1,5 +1,5 @@
 <div id="search-form" style="margin-bottom: 1em;">
-  <% form_tag(artists_path, :method => :get) do %>
+  <%= form_tag(artists_path, :method => :get) do %>
     <%= text_field_tag "name", params[:name], :size => 40 %>
     <%= submit_tag "Search" %>
   <% end %>