Adds a branch for unlimited project hierarchy.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/branches/work@2148 e93f8b46-1217-0410-a6f0-8f06a7374b81

nested_projects/db/migrate/046_create_messages.rb

@@ -0,0 +1,21 @@
+class CreateMessages < ActiveRecord::Migration
+  def self.up
+    create_table :messages do |t|
+      t.column :board_id, :integer, :null => false
+      t.column :parent_id, :integer
+      t.column :subject, :string, :default => "", :null => false
+      t.column :content, :text
+      t.column :author_id, :integer
+      t.column :replies_count, :integer, :default => 0, :null => false
+      t.column :last_reply_id, :integer
+      t.column :created_on, :datetime, :null => false
+      t.column :updated_on, :datetime, :null => false
+    end
+    add_index :messages, [:board_id], :name => :messages_board_id
+    add_index :messages, [:parent_id], :name => :messages_parent_id
+  end
+
+  def self.down
+    drop_table :messages
+  end
+end