锚点 & 和别名 * , 可以用来引用
| defaults: &defaults |
| adapter: postgres |
| host: localhost |
| development: |
| database: myapp_development, |
| <<: *defaults |
| test: |
| database: myapp_test, |
| <<: *defaults |
相当于
| defaults: |
| adapter: postgres |
| host: localhost |
| development: |
| database: myapp_development, |
| adapter: postgres |
| host: localhost |
| test: |
| database: myapp_test, |
| adapter: postgres |
| host: localhost |
下面另外一个例子
| - &showell Steve |
| - Clark |
| - Brian |
| - Oren |
| - *showell |
| [ 'Steve', 'Clark', 'Brian', 'Oren', 'Steve' ] |
