Change type for column 'rate' in players model to Float.

Author: Hidetchi

db/migrate/20110621222130_change_rate_type_to_float.rb

@@ -0,0 +1,9 @@
+class ChangeRateTypeToFloat < ActiveRecord::Migration
+  def self.up
+    change_column :players, :rate, :float
+  end
+
+  def self.down
+    change_column :players, :rate, :integer
+  end
+end