## activerecord-turntable 2.0.2 ##

### Bugfixes

* Fix method definition bug on 2.0.1

## activerecord-turntable 2.0.1 ##

### Bugfixes

* support `update_columns`

## activerecord-turntable 2.0.0 ##

First release for ActiveRecord 4.x

### Incompatible Changes

#### Support ActiveRecord 4.x, drop support AR 3.x

If you are using AR 3.x, use turntable 1.x.

#### Default, Migration will be executed to all shards

Migration had been executed to only master database on turntable 1.x.

On turntable 2.x, migration is executed to all shards as default behavior.

#### Multiple Sequencer

Multiple sequencers supported.

Please pass sequencer's name Symbol to `sequencer` DSL:

```ruby
sequencer :user_seq
```

### Features

#### Barrage sequencer

Supported [barrage](http://github.com/drecom/barrage) gem as sequencer

#### Better association support

When using association(or association preloading), Turntable would add shard key condition to relation object if associated models has the same shard key name.

If two related models has different named keys(but same meaning), you can pass option `foreign_shard_key` to association option.

Example:

```ruby
class UserReceivedItemHistory < ActiveRecord::Base
  has_many :user, foreign_shard_key: :receiver_user_id
end
```

#### Exception on performance notice

On development environment, you can receive exception about queries that may cause a performance problem.

Add follow option to `turntable.yml`:

* raise\_on\_not\_specified\_shard\_query(default: false)
* raise\_on\_not\_specified\_shard\_update(default: false)

#### Add cluster transaction

To create transaction to all shards on the cluster:

```ruby
User.user_cluster_transaction do
  # transaction opened on all shards in 'user_cluster'
end
```

### Bugfixes

* Fix thread-safety bug


## activerecord-turntable 1.1.2 ##

*   Increase sequence table performance (by hanabokuro)

## activerecord-turntable 1.1.1 ##

*   Enable query caching

## activerecord-turntable 1.1.0 ##

*   AR::Base.clear_active_connections! should be proxied to all shards

*   Reduce unnecessary query when reloading


## activerecord-turntable 1.0.1 ##

*   Added missing setting for sequences at README and turntable.yml template.


## activerecord-turntable 1.0.0 ##

*   First Release!