Travis CI で utf8mb4 を使えるようにする

.travis.yml

@@ -6,6 +6,9 @@ services:
   - mysql
 before_script:
   - cp config/database.yml.travis config/database.yml
+  - mysql -u root -e 'SET GLOBAL innodb_file_format = Barracuda'
+  - mysql -u root -e 'SET GLOBAL innodb_file_per_table = 1'
+  - mysql -u root -e 'SET GLOBAL innodb_large_prefix = 1'
   - mysql -e 'CREATE DATABASE IF NOT EXISTS log_archiver_test;'
 notifications:
   irc:

config/initializers/ar_innodb_row_format.rb

@@ -0,0 +1,16 @@
+# create_table メソッドで 'ROW_FORMAT=DYNAMIC' が
+# デフォルトで指定されるようにする
+# @see http://qiita.com/kamipo/items/101aaf8159cf1470d823
+ActiveSupport.on_load :active_record do
+  module ActiveRecord::ConnectionAdapters
+    class AbstractMysqlAdapter
+      def create_table_with_innodb_row_format(table_name, options = {})
+        table_options = options.merge(:options => 'ENGINE=InnoDB ROW_FORMAT=DYNAMIC')
+        create_table_without_innodb_row_format(table_name, table_options) do |td|
+          yield td if block_given?
+        end
+      end
+      alias_method_chain :create_table, :innodb_row_format
+    end
+  end
+end