* Refactored post history. Each post now has a single history record. This history record has multiple revisions, serialized as JSON in a text field.

app/controllers/post_histories_controller.rb

@@ -0,0 +1,6 @@
+class PostHistoriesController < ApplicationController
+  def index
+    @search = PostHistory.search(params[:search])
+    @histories = @search.paginate(:page => params[:page], :per_page => 20)
+  end
+end

app/controllers/post_versions_controller.rb

@@ -1,4 +0,0 @@
-class PostVersionsController < ApplicationController
-  def index
-  end
-end

app/models/post_history.rb

@@ -1,5 +1,60 @@
 class PostHistory < ActiveRecord::Base
   class Error < Exception ; end
+  
+  class Revision
+    attr_accessor :prev, :hash, :diff, :tag_array
+    
+    def initialize(hash)
+      @hash = hash
+      @diff = {}
+      @tag_array = Tag.scan_tags(@hash["tag_string"])
+    end
+    
+    def calculate_diff
+      if prev.nil?
+        diff[:add] = tag_array
+        diff[:del] = []
+        diff[:rating] = rating
+        diff[:source] = source
+        diff[:parent_id] = parent_id
+      else
+        diff[:del] = prev.tag_array - tag_array
+        diff[:add] = tag_array - prev.tag_array
+        
+        if prev.rating != rating
+          diff[:rating] = rating
+        end
+        
+        if prev.source != source
+          diff[:source] = source
+        end
+        
+        if prev.parent_id != parent_id
+          diff[:parent_id]= parent_id
+        end
+      end
+    end
+    
+    def rating
+      hash["rating"]
+    end
+    
+    def source
+      hash["source"]
+    end
+    
+    def parent_id
+      hash["parent_id"]
+    end
+    
+    def updated_at
+      hash["updated_at"]
+    end
+    
+    def updater_id
+      hash["user_id"]
+    end
+  end
 
   before_validation :initialize_revisions, :on => :create
   belongs_to :post
@@ -37,4 +92,19 @@ class PostHistory < ActiveRecord::Base
     write_attribute(:revisions, (revisions << revision).to_json)
     save
   end
+  
+  def each_revision(&block)
+    array = revisions.map {|x| Revision.new(x)}
+    link_revisions(array)
+    array.each {|x| x.calculate_diff}
+    array.each(&block)
+  end
+  
+  private
+    def link_revisions(array)
+      1.upto(array.size - 1) do |i|
+        array[i].prev = array[i - 1]
+      end
+    end
+  
 end

app/presenters/post_history_presenter.rb

@@ -0,0 +1,19 @@
+class PostHistoryPresenter < Presenter
+  attr_reader :revision
+  
+  def initialize(revision)
+    @revision = revision
+  end
+  
+  def changes
+    
+  end
+  
+  def updated_at
+    revision["updated_at"]
+  end
+  
+  def updater_name
+    User.id_to_name(revision["user_id"].to_i)
+  end
+end

app/presenters/post_presenter.rb

@@ -1,7 +1,24 @@
 class PostPresenter < Presenter
+  def self.preview(post)
+    flags = []
+    flags << "pending" if post.is_pending?
+    flags << "flagged" if post.is_flagged?
+    flags << "removed" if post.is_removed?
+    
+    html =  %{<article id="post_#{post.id}" data-id="#{post.id}" data-tags="#{h(post.tag_string)}" data-uploader="#{h(post.uploader_name)}" data-rating="#{post.rating}" data-width="#{post.image_width}" data-height="#{post.image_height}" data-flags="#{flags.join(' ')}">}
+    html << %{<a href="/posts/#{post.id}">}
+    html << %{<img src="#{post.preview_file_url}">}
+    html << %{</a>}
+    html << %{</article>}
+  end
+  
   def initialize(post)
     @post = post
   end
+  
+  def preview_html
+    PostPresenter.preview(@post)
+  end
 
   def image_html(template)
     return template.content_tag("p", "This image was deleted.") if @post.is_removed? && !CurrentUser.user.is_janitor?

app/presenters/post_set_presenter.rb

@@ -50,16 +50,7 @@ class PostSetPresenter < Presenter
     html = ""
     
     posts.each do |post|
-      flags = []
-      flags << "pending" if post.is_pending?
-      flags << "flagged" if post.is_flagged?
-      flags << "removed" if post.is_removed?
-      
-      html << %{<article id="post_#{post.id}" data-id="#{post.id}" data-tags="#{h(post.tag_string)}" data-uploader="#{h(post.uploader_name)}" data-rating="#{post.rating}" data-width="#{post.image_width}" data-height="#{post.image_height}" data-flags="#{flags.join(' ')}">}
-      html << %{<a href="/posts/#{post.id}">}
-      html << %{<img src="#{post.preview_file_url}">}
-      html << %{</a>}
-      html << %{</article>}
+      html << PostPresenter.preview(post)
     end
     
     html.html_safe

app/views/post_histories/index.html.erb

@@ -0,0 +1,35 @@
+<div class="post_histories">
+  <div class="index">
+    <h1>Post History</h1>
+    
+    <% @histories.each do |history| %>
+      <div class="post">
+        <div class="preview">
+          <%= history.post.presenter.preview_html %>
+        </div>
+      
+        <div class="history">
+          <table>
+            <thead>
+              <tr>
+                <th>Changes</th>
+                <th>Date</th>
+                <th>Updater</th>
+              </tr>
+            </thead>
+            <tbody>
+              <% history.each_revision do |revision| %>
+                <tr>
+                  <td><%= revision.presenter.changes %></td>
+                  <td><%= revision.presenter.updated_at %></td>
+                  <td><%= revision.presenter.updater_name %></td>
+                </tr>
+              <% end %>
+            </tbody>
+          </table>
+        </div>
+      </div>
+    <% end %>
+  </div>
+</div>
+