Rails 的plugin_migrations支持多数据库迁移

plugin_migrations

plugin_migrations adds support for plugin-based migrations.

Resources

Announcement

• http://www.pluginaweek.org/2006/11/05/3-plugin_migrations-where-have-all-the-migrations-gone

Wiki

• http://wiki.pluginaweek.org/Plugin_migrations

API

• http://api.pluginaweek.org/plugin_migrations

Development

• http://dev.pluginaweek.org/browser/trunk/plugins/active_record/migrations/plugin_migrations

Source

• http://svn.pluginaweek.org/trunk/plugins/active_record/migrations/plugin_migrations

Description

In addition to the normal schema_info table that Rails created in your database to keep track of the current migration version, this plugin adds a new table called plugin_schema_info:

  plugin_schema_info
  ------------------
  plugin_name (string)
  version (integer)

Plugin migrations expects the migrations to be located in a similar directory structure as that of your Rails application. That is, it would look in /db/migrate in your plugin’s folder.

Usage

The plugin can be used via the new rake tasks that have been added. The plugins which are migrated are based on what is stored in +Rails.plugins+. For more information on this attributes, see the loaded_plugins[http://wiki.pluginaweek.org/Loaded_plugins] plugin.

db:migrate:plugins

Running db:migrate:plugins will run the migrations for every plugin that is loaded. You can also specify exactly which plugin you want to migrate.

Examples:

Assuming the following directory structure:

  vendor/
  vendor/plugins/
  vendor/plugins/acts_as_bunny/
  vendor/plugins/acts_as_as_chicken/

  rake db:migrate:plugins # Migrates both acts_as_bunny and acts_as_chicken
  rake db:migrate:plugins PLUGIN=acts_as_bunny
  rake db:migrate:plugins PLUGIN=acts_as_bunny VERSION=2

db:fixtures:load:plugins

Running db:fixtures:load:plugins will load the fixtures for every plugin that is loaded. You can also specify exactly which plugin you want to load fixtures for.

Examples:

Assuming the following directory structure:

  vendor/
  vendor/plugins/
  vendor/plugins/acts_as_bunny/
  vendor/plugins/acts_as_as_chicken/

  rake db:fixtures:load:plugins # Loads fixtures for both acts_as_bunny and acts_as_chicken
  rake db:fixtures:load:plugins PLUGIN=acts_as_bunny
  rake db:fixtures:load:plugins PLUGIN=acts_as_bunny FIXTURES=bunnies
  rake db:fixtures:load:plugins PLUGIN=acts_as_bunny FIXTURES=bunnies,rabbits

Testing

Before you can run any tests, the following gems must be installed:

• plugin_test_helper[http://wiki.pluginaweek.org/Plugin_test_helper]

Dependencies

This plugin dependencies on the presence of the following plugins:

• loaded_plugins[http://wiki.pluginaweek.org/Loaded_plugins]
• plugin_dependencies[http://wiki.pluginaweek.org/Plugin_dependencies]

References

• James Adam - Engines[http://www.rails-engines.org]