fixok-ut-mephi-ru/db/migrate/20161103160230_convert_tables_to_utf8.rb

class ConvertTablesToUtf8 < ActiveRecord::Migration
	def change_encoding(encoding,collation)
		connection = ActiveRecord::Base.connection
		tables = connection.tables
		dbname = connection.current_database
		execute <<-SQL
			ALTER DATABASE #{dbname} CHARACTER SET #{encoding} COLLATE #{collation};
		SQL
		tables.each do |tablename|
		execute <<-SQL
			ALTER TABLE #{dbname}.#{tablename} CONVERT TO CHARACTER SET #{encoding} COLLATE #{collation};
		SQL
		end
	end

	def change
		reversible do |dir|
			dir.up do
				change_encoding('utf8','utf8_general_ci')
			end
			dir.down do
				change_encoding('latin1','latin1_swedish_ci')
			end
		end
	end
end