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Convenience APIs for working with shards and reading from slaves

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README.md

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Overview

This provides an API to easily use ActiveRecord with multiple connections - for example:

  • Reading from slaves
  • Using multiple shards

Usage

module MyDB
  class Widget < ActiveRecord::Base; end
  include MyStuff::MultiDB
end

MyDB.with_spec(:adapter => 'sqlite3', :database => ':memory:') do |db,spec|
  db::Widget.create(...)
end

How It Works

For every spec, it defines a new sub-module of MyStuff::MultiDB, which encodes the database details, and creates new subclasses of your ActiveRecord::Base classes, within these modules. For example:

$ bin/my_stuff-multidb-unmangle MyStuff::MultiDB::MYSTUFF_MULTIDB_DB_216c6f63616c686f7374213333303621::MyDB::Widget
MyStuff::MultiDB::<localhost:3306/>::MyDB::Widget
$

There's also lots of deep voodoo making the ActiveRecord stack use the right connection details :)

Caveats

You can not do cross-shard operations simply, eg joins.

License

Copyright (c) 2011-2012, Fred Emmott <copyright@fredemmott.co.uk>

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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