具有特定于案例值的 YAML 可重用变量 [英] YAML reusable variables with case-specific values

问题描述

.yml 配置中是否有可能在根据特定情况设置的变量中具有动态属性.例如:

Is it possible in .yml config to have dynamic properties in variables that are set depending on a particular case. For example:

MY_VAR: &MY_VAR
  keys:
   key2: blahblahblah
   key3: blahblahblah  # only apply this for section2, not section1

section1: 
 var: *MY_VAR

section2:  # this case needs key3 set, otherwise everything else is the same 
 var: *MY_VAR

推荐答案

YAML 的锚(&MY_VAR)和引用(*MY_VAR)在规范中是为了防止重复，而且还允许对层次结构中多次出现的对象进行序列化，并允许对它们进行反序列化，以便它们再次指向内存中的相同结构.

YAML's anchors (&MY_VAR) and references (*MY_VAR) are in the specification to prevent duplication, but also to allow serialisation of objects that occur multiple times in a hierarchy, and to allow them to be deserialized so that they again point to the same structure in memory.

这不是带有参数和/或条件的字符串级宏工具.在您的示例中，如果您设置 MY_VAR->key1 您还会更改 section1->var->key1

This is not some string level macro facility with parameters and/or conditions. In your example, if you set MY_VAR->key1 you also change the value of section1->var->key1

当然，应用程序可以解释它加载的值(例如，在为映射中的键形成标量的复杂字符串上)，但 YAML 规范中没有这种功能.这必须(并且可以)在应用程序级别完成.

Of course an application can interpret the values it loads (e.g. on complex strings that form scalar for the key in a mapping), but for that there is no facility in the YAML specification. That has to be (and can be) done at the application level.

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