openssl req -new -nodes -sha256 -newkey rsa:2048 -keyout my.key -out my.csr

使用type作为字段名会出现这个错误： ActiveRecord::SubclassNotFound: The single-table inheritance mechanism failed to locate the subclass: 'xxxx'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to ...