是否有任何解决方案来制作rails app数据库的ascii演示文稿。 像这样：
+-------------+ +---------------+ +----------------+
|User | |Post | |Comment |
|id: integer | |id: integer | |id: integer |
|login: string| |subject: string| |body: text |
+-------------+ |body: text | |user_id: integer|
+---------------+ +----------------+