= YamlDb

YamlDb is a database-independent format for dumping and restoring data.  It complements the the database-independent schema format found in db/schema.rb.  The data is saved into db/data.yml.

This can be used as a replacement for mysqldump or pg_dump, but only for the databases typically used by Rails apps.  Users, permissions, schemas, triggers, and other advanced database features are not supported - by design.

Any database that has an ActiveRecord adapter should work.

== Usage

rake db:data:dump   ->   Dump contents of Rails database to db/data.yml
rake db:data:load   ->   Load contents of db/data.yml into the database


 *update*

Use the TABLE flag to specify dumping or loading a single table, it will
name the YAML file after that table in that case. Not putting a TABLE flag will default to the
original behaviour.

rake db:data:dump TABLE=products
rake db:data:load TABLE=categories



Further, there are tasks db:dump and db:load which do the entire database (the equivalent of running db:schema:dump followed by db:data:load).

== Examples

One common use would be to switch your data from one database backend to another.  For example, let's say you wanted to switch from SQLite to MySQL.  You might execute the following steps:

1. rake db:dump

2. Edit config/database.yml and change your adapter to mysql, set up database params

3. mysqladmin create [database name]

4. rake db:load

== Credits

Created by Orion Henry and Adam Wiggins.  Major updates by Ricardo Chimal, Jr.

Patches contributed by Michael Irwin, Tom Locke, and Tim Galeckas.

Send questions, feedback, or patches to the Heroku mailing list: http://groups.google.com/group/heroku