added new tag batch change model

app/controllers/moderator/tags_controller.rb

@@ -0,0 +1,14 @@
+module Moderator
+  class TagsController < ApplicationController
+    before_filter :moderator_only
+    
+    def edit
+    end
+    
+    def update
+      tag_batch_change = TagBatchChange.new(params[:tag][:predicate], params[:tag][:consequent])
+      tag_batch_change.execute
+      redirect_to edit_moderator_tag_path, :notice => "Posts updated"
+    end
+  end
+end

app/logical/moderator/tag_batch_change.rb

@@ -0,0 +1,24 @@
+module Moderator
+  class TagBatchChange
+    class Error < Exception ; end
+    
+    attr_reader :predicate, :consequent
+    
+    def initialize(predicate, consequent)
+      @predicate = predicate
+      @consequent = consequent
+    end
+    
+    def execute
+      raise Error.new("Predicate is missing") if predicate.blank?
+      
+      normalized_predicate = TagAlias.to_aliased(::Tag.scan_tags(predicate))
+      normalized_consequent = TagAlias.to_aliased(::Tag.scan_tags(consequent))
+
+      ::Post.tag_match(predicate).each do |post|
+        tags = (post.tag_array - normalized_predicate + normalized_consequent).join(" ")
+        post.update_attributes(:tag_string => tags)
+      end
+    end
+  end
+end

app/models/tag.rb

@@ -106,21 +106,7 @@ class Tag < ActiveRecord::Base
       m.extend(ClassMethods)
     end
   end
-  
-  module UpdateMethods
-    def mass_edit(start_tags, result_tags, updater_id, updater_ip_addr)
-      updater = User.find(updater_id)
-      Post.tag_match(start_tags).each do |p|
-        start = TagAlias.to_aliased(scan_tags(start_tags))
-        result = TagAlias.to_aliased(scan_tags(result_tags))
-        tags = (p.tag_array - start + result).join(" ")
-        CurrentUser.scoped(updater, updater_ip_addr) do
-          p.update_attributes(:tag_string => tags)
-        end
-      end    
-    end
-  end
-  
+
   module ParseMethods
     def normalize(query)
       query.to_s.downcase.strip
@@ -367,7 +353,6 @@ class Tag < ActiveRecord::Base
   include CategoryMethods
   extend StatisticsMethods
   include NameMethods
-  extend UpdateMethods
   extend ParseMethods
   extend SuggestionMethods
 end

app/views/moderator/tags/edit.html.erb

@@ -0,0 +1,21 @@
+<div id="c-moderator-tags">
+  <div id="a-edit">
+    <h1>Edit Tags</h1>
+    
+    <%= form_tag(moderator_tag_path, :method => :put) do %>
+      <div class="input">
+        <label>Predicate</label>
+        <%= text_field :tag, :predicate %>
+      </div>
+      
+      <div class="input">
+        <label>Consequent</label>
+        <%= text_field :tag, :consequent %>
+      </div>
+      
+      <div class="input">
+        <%= submit_tag %>
+      </div>
+    <% end %>
+  </div>
+</div>