how to add indentation for array element

[YK-Unit]

When psych dump object to yaml file, I hope psych can add indentation for array element, for example:

parent:
  - child
  - child

And yet it is：

parent:
- child
- child

So I wonder how to add indentation for array element. Look forward to your solution, thanks very much.

[NickHackman]

Seconding this, it would be nice to have support for array indentation following the indentation option passed to dump or to_yaml would be ideal. If this already exists I haven't been able to find any sort of documentation referencing it.

If it needs to be implemented then I'd be interested in implementing this feature 👍

[Paxa]

It looks much better with indentation

[cvirtucio]

any update on this?

also the documentation seems incorrect. the dump class method creates a YAMLTree visitor with the options, but I'm not seeing any reference to the indentation symbol in any of the usages of the @options field: https://github.com/ruby/psych/blob/v5.1.2/lib/psych/visitors/yaml_tree.rb#L105-L118