Move db engine changing into db adaptor monkeypatch

db/migrate/002_cleanup_osm_db.rb

@@ -29,7 +29,7 @@ class CleanupOsmDb < ActiveRecord::Migration
     change_column "current_ways", "user_id", :bigint, :limit => 20, :null => false
     change_column "current_ways", "timestamp", :datetime, :null => false
     change_column "current_ways", "visible", :boolean, :null => false
-    execute "ALTER TABLE current_ways ENGINE = InnoDB"
+    change_engine "current_ways", "InnoDB"
 
     change_column "diary_entries", "title", :string, :null => false
     change_column "diary_entries", "body", :text, :null => false
@@ -191,7 +191,7 @@ class CleanupOsmDb < ActiveRecord::Migration
     change_column "diary_entries", "body", :text
     change_column "diary_entries", "title", :string, :default => nil
 
-    execute "ALTER TABLE current_ways ENGINE = MyISAM"
+    change_engine "current_ways", "MyISAM"
     change_column "current_ways", "visible", :boolean
     change_column "current_ways", "timestamp", :datetime
     change_column "current_ways", "user_id", :bigint, :limit => 20

db/migrate/003_sql_session_store_setup.rb

@@ -1,6 +1,6 @@
 class SqlSessionStoreSetup < ActiveRecord::Migration
   def self.up
-    create_table "sessions", :options => "ENGINE=InnoDB" do |t|
+    create_table "sessions", :options => innodb_option do |t|
       t.column "session_id", :string
       t.column "data",       :text
       t.column "created_at", :timestamp

db/migrate/019_move_to_innodb.rb

@@ -14,7 +14,7 @@ class MoveToInnodb < ActiveRecord::Migration
     }
 
     @@conv_tables.each { |tbl|
-      execute "ALTER TABLE #{tbl} ENGINE = InnoDB"
+      change_engine (tbl, "InnoDB")
     }
 
     @@ver_tbl.each { |tbl|

lib/migrate.rb

@@ -73,6 +73,14 @@ module ActiveRecord
       def innodb_table
         return { :id => false, :force => true, :options => "ENGINE=InnoDB" }
       end
+
+      def innodb_option
+        return "ENGINE=InnoDB"
+      end
+ 
+      def change_engine (table_name, engine)
+        execute "ALTER TABLE #{table_name} ENGINE = #{engine}"
+      end
     end
   end
 end