使用rails console 删除表和migrate里面的时间戳

删除数据表（生产环境下谨慎操作）

/home/git/project/db/migrate/20141114074659_create_skills.rb

ActiveRecord::Base.connection.execute("skills")

ActiveRecord::Migration.drop_table(:skills)

删除某一条时间戳

ActiveRecord::Base.connection.execute("DELETE FROM schema_migrations WHERE version=20141114074659;")

删除完成后

rake db migrate

mysql操作：

use  xxx_production
DELETE FROM schema_migrations WHERE version=20141114074659;