Sexy migrations for the session_migration generator. Closes #8561.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6938 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/CHANGELOG

 *SVN*
 
+* Sexy migrations for the session_migration generator.  #8561 [Vladislav]
+
 * Console reload! runs to_prepare callbacks also.  #8393 [f.svehla]
 
 * Generated migrations include timestamps by default.  #8501 [Shane Vitarana]

railties/lib/rails_generator/generators/components/session_migration/templates/migration.rb

 class <%= class_name %> < ActiveRecord::Migration
   def self.up
     create_table :<%= session_table_name %> do |t|
-      t.column :session_id, :string
-      t.column :data, :text
-      t.column :updated_at, :datetime
+      t.string :session_id, :null => false
+      t.text :data
+      t.timestamps
     end
 
     add_index :<%= session_table_name %>, :session_id