1.6.2 (2010-04-03):

Bugfix release: Modified our stub connection used on sharded models to fail on db-calling
methods only. Proxy the rest to a real shard connection. Another bug fixed in db_block_map
sharding method: we didn't increment block counters when assigning blocks to shards.

----------------------------------------------------------------------------------------
1.6.1 (2010-03-31):

Breaking change from now on all connection-switching methods (both in migrations and in
models) are controlled by a single option DbCharmer.connections_should_exist. This
option is false by default in all non-production environments. Check out README for
more details.

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1.6.0 (2010-03-31):

The major (and arguably the only noticeable) change in this version is our simple database
sharding support. The feature is still in alpha stage and should not be used in production
without complete understanding of the principles of its work.

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1.5.5 (2010-03-15):

Thanks to ngmoco.com (http://github.com/ngmoco) now DbCharmer supports one more use-case
for multi-db migrations. Now you can run the same migration on many databases at once.
For example, the following migration would create test_table on all three shard databases:

    class MultiDbTest < ActiveRecord::Migration
      db_magic :connections => [ :shard01, :shard02, :shard03 ]

      def self.up
        create_table :test_table do |t|
          t.string :test_string
          t.timestamps
        end
      end

      def self.down
        drop_table :test_table
      end
    end

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1.5.4 (2010-03-12):

Added DbCharmer.with_remapped_databases, so that you can change the connection for
many models simultaneously, and implicitly. Very useful for work where you want to use
a particular slave for a whole range of database access.

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1.5.3 (2010-03-10):

Few changes:
 * Colorized connection names in the logs for development mode
 * We do not log connection names when connection does not exist

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1.5.1 (2010-03-06):

In this version we've added support for connection names logging in Rails queries log.
New log records have [connection_name] prefix for all queries that are executed on
non-standard connections:

[logs]   LogRecord Columns (1.1ms)   SHOW FIELDS FROM `log_records`
[logs]   User Delete all (0.1ms)   DELETE FROM `users`
[slave01]   User Load (0.2ms)   SELECT * FROM `users` WHERE (`users`.`login` = 'foo')

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1.4.6 -> 1.5.0 (2010-03-05):

Major change in this version of DbCharmer is association preload support. For example,
let's say we have a schema:

    class Post < ActiveRecord::Base
      belongs_to :user
    end

    class User < ActiveRecord::Base
      has_many :posts
    end

Now, if we have the following call in our code:

    User.on_db(:foo).all(:include => :posts)

In 1.4.6 it would load the users from connection :foo and posts from the
default connection, which is not what we would expect from this line of code.
So, starting 1.5.0 all finder calls on models having :include parameter would
switch associated models' connections to the same connection as the main model
in the call.