Create and drop specific shard DB.

README.mkdn

@@ -158,6 +158,18 @@ Then you can use the `SHARD` environment variable to override the `master_shard`
 SHARD=shard1 rake db:setup && SHARD=shard2 rake db:setup
 ```
 
+For creating specific shard DB use:
+
+```bash
+SHARD=shard1 rake db:shards:create
+```
+
+For droping specific shard DB use:
+
+```bash
+SHARD=shard1 rake db:shards:drop
+```
+
 ### Rails Controllers
 
 If you want to send a specified action, or all actions from a controller, to a specific shard,  use this syntax:

lib/tasks/shards_db.rake

@@ -0,0 +1,38 @@
+namespace :db do
+  namespace :shards do
+    desc 'Create shard DB'
+    task create: :load_config do
+      include ActiveRecord::Tasks
+
+      shard = ENV['SHARD']
+      rails_env = ENV['RAILS_ENV'] || "development"
+
+      DatabaseTasks.database_configuration = Octopus.config[rails_env][rails_env]
+
+      if shard
+        DatabaseTasks.create(DatabaseTasks.database_configuration[shard]) unless DatabaseTasks.database_configuration[shard].nil?
+      else
+        DatabaseTasks.database_configuration.each do |_, value|
+          DatabaseTasks.create(value)
+        end
+      end
+    end
+
+    desc 'Drop shard DB'
+    task drop: :load_config do
+      include ActiveRecord::Tasks
+
+      shard = ENV['SHARD']
+      rails_env = ENV['RAILS_ENV'] || "development"
+
+      DatabaseTasks.database_configuration = Octopus.config[rails_env][rails_env]
+
+      if shard
+        DatabaseTasks.drop(DatabaseTasks.database_configuration[shard]) unless DatabaseTasks.database_configuration[shard].nil?
+      else
+        DatabaseTasks.database_configuration.each do |_, value|
+          DatabaseTasks.drop(value)
+        end
+      end
+    end
+  end