Add a generator for db migrations

CHANGELOG.rdoc

@@ -1,5 +1,6 @@
 == master
 
+* Add a generator for db migrations
 * Release gems via rake-gemcutter instead of rubyforge
 * By default, sort messages newest first [Alexander Lang]
 

README.rdoc

@@ -33,6 +33,17 @@ demonstrating a reference implementation of these features.
 
 == Usage
 
+=== Installation
+
++has_messages+ requires additional database tables to work.  You can generate
+a migration for these tables like so:
+
+  script/generate has_messages
+
+Then simply migrate your database:
+
+  rake db:migrate
+
 === Adding message support
 
   class User < ActiveRecord::Base

Rakefile

@@ -11,7 +11,7 @@ spec = Gem::Specification.new do |s|
   s.summary           = 'Demonstrates a reference implementation for sending messages between users in ActiveRecord'
   s.description       = s.summary
 
-  s.files             = FileList['{app,db,lib,test}/**/*'] + %w(CHANGELOG.rdoc init.rb LICENSE Rakefile README.rdoc) - FileList['test/app_root/{log,log/*,script,script/*}']
+  s.files             = FileList['{app,generators,lib,test}/**/*'] + %w(CHANGELOG.rdoc init.rb LICENSE Rakefile README.rdoc) - FileList['test/app_root/{log,log/*,script,script/*}']
   s.require_path      = 'lib'
   s.has_rdoc          = true
   s.test_files        = Dir['test/**/*_test.rb']

generators/has_messages/USAGE

@@ -0,0 +1,5 @@
+Usage:
+
+  script/generate has_messages
+
+This will create migrations that will add the proper tables to store messages.

generators/has_messages/has_messages_generator.rb

@@ -0,0 +1,9 @@
+class HasMessagesGenerator < Rails::Generator::Base
+  def manifest
+    record do |m|
+      m.migration_template '001_create_messages.rb', 'db/migrate', :migration_file_name => 'create_messages'
+      m.sleep 1
+      m.migration_template '002_create_message_recipients.rb', 'db/migrate', :migration_file_name => 'create_message_recipients'
+    end
+  end
+end

test/app_root/db/migrate/002_migrate_has_messages_to_version_2.rb

@@ -1,12 +1,12 @@
 class MigrateHasMessagesToVersion2 < ActiveRecord::Migration
   def self.up
-    ActiveRecord::Migrator.new(:up, "#{Rails.root}/../../db/migrate", 0).migrations.each do |migration|
+    ActiveRecord::Migrator.new(:up, "#{Rails.root}/../../generators/has_messages/templates", 0).migrations.each do |migration|
       migration.migrate(:up)
     end
   end
 
   def self.down
-    ActiveRecord::Migrator.new(:up, "#{Rails.root}/../../db/migrate", 0).migrations.each do |migration|
+    ActiveRecord::Migrator.new(:down, "#{Rails.root}/../../generators/has_messages/templates", 0).migrations.each do |migration|
       migration.migrate(:down)
     end
   end