scala 如何在命令行上覆盖类型安全配置列表值？
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How can I override a typesafe config list value on the command line?
提问by Michael Frank
I have an application.conffile with a structure like the following:
我有application.conf一个结构如下的文件：
poller {
datacenters = []
}
I would like to override "datacenters"on the command line.
我想"datacenters"在命令行上覆盖。
For other configuration keys whose values are simple types (strings, numbers) I can override using -Dpath.to.config.value=<value>, and this works fine.
对于值为简单类型（字符串、数字）的其他配置键，我可以使用 覆盖-Dpath.to.config.value=<value>，这很好用。
However, I can't seem to find a way to do this for lists. In the example above, I tried to set "datacenters"to ["SJC", "IAD"]like so: -Dpoller.datacenters="['SJC', 'IAD']", but I get an exception that the key value is a string, not a list.
但是，我似乎找不到对list执行此操作的方法。在上面的例子中，我试图设置"datacenters"为["SJC", "IAD"]like so: -Dpoller.datacenters="['SJC', 'IAD']"，但我得到一个例外，即键值是一个字符串，而不是一个列表。
Is there a way to signal to the typesafe config library that this value is a list?
有没有办法向类型安全配置库发出这个值是一个列表的信号？
回答by Patrik Nordwall
An alternative syntax is implemented in version 1.0.1 for this:
版本 1.0.1 中为此实现了另一种语法：
-Dpoller.datacenters.0=SJC -Dpoller.datacenters.1=IAD
回答by Alois Cochard
I had the same issue some weeks ago, and finally dived into the source code to understand what's going on:
几周前我遇到了同样的问题，最后深入研究源代码以了解发生了什么：
- This feature is not implemented, it's not possible to define a list using command line argument
- 此功能未实现，无法使用命令行参数定义列表
Fixing it wouldn't be that hard, but someone need to take time to do it.
修复它不会那么难，但需要有人花时间去做。
