Split comment field out of map bugs table

Rather than have all comments in a single text field, have each comment in its own entry
and only combine them back on output

db/migrate/051_refactor_map_bug_tables.rb

@@ -0,0 +1,36 @@
+require 'lib/migrate'
+
+class RefactorMapBugTables < ActiveRecord::Migration
+  def self.up
+
+
+    create_table :map_bug_comment do |t|
+      t.column :id, :bigint, :null => false
+	  t.column :bug_id, :bigint, :null => false
+      t.boolean :visible, :null => false 
+      t.datetime :date_created, :null => false
+	  t.string :commenter_name
+	  t.string :commenter_ip
+	  t.column :commenter_id, :bigint
+      t.string :comment
+    end
+
+	remove_column :map_bugs, :text 
+
+    add_index :map_bug_comment, [:bug_id], :name => "map_bug_comment_id_idx"
+	add_foreign_key :map_bug_comment, [:bug_id], :map_bugs, [:id]
+	add_foreign_key :map_bug_comment, [:commenter_id], :users, [:id]
+
+  end
+
+  def self.down
+
+	add_column :map_bugs, :text, :string
+
+    remove_index :map_bugs, :name => "map_bug_comment_id_idx"
+	remove_foreign_key :map_bug_comment, [:bug_id]
+	remove_foreign_key :map_bug_comment, [:commenter_id]
+
+    drop_table :map_bugs_comment
+  end
+end