implemented moderator dashboard queue

app/logical/moderator/dashboard/queries/wiki_page.rb

@@ -0,0 +1,30 @@
+module Moderator
+  module Dashboard
+    module Queries
+      class WikiPage
+        attr_reader :user, :count
+        
+        def self.all(min_date, max_level)
+          sql = <<-EOS
+            SELECT wiki_page_versions.updater_id, count(*) 
+            FROM wiki_page_versions 
+            JOIN users ON users.id = wiki_page_versions.updater_id 
+            WHERE 
+              wiki_page_versions.created_at > ? 
+              AND users.level <= ? 
+            GROUP BY wiki_page_versions.updater_id 
+            ORDER BY count(*) DESC 
+            LIMIT 10
+          EOS
+          
+          ActiveRecord::Base.select_all_sql(sql, min_date, max_level).map {|x| new(x)}
+        end
+        
+        def initialize(hash)
+          @user = ::User.find(hash["updater_id"])
+          @count = hash["count"]
+        end
+      end
+    end
+  end
+end