String interpolation in YAML

感情迁移 提交于 2019-11-27 09:43:14
Paul Fioravanti

Unfortunately, you're out of luck. To do what you want you'd need to pass in $home from a view file (or wherever) and interpolate it in your yaml entry, which could possibly look something like:

Alice: ! '%{home}/Alice' 

See this StackOverflow Q&A for the detailed answer to pretty much exactly your question.

You should use ERB template.

you can write like following:

Alice: <%=home%>/alice

When use, you need parse home value with ERB before parse as YAML. if home is local variable, you need pass local binding in as #result method's argument. if you not pass this, will use TOP LEVEL binding as default.

Like this:

require 'erb'

home = 'home'
YAML.load(ERB.new(yaml_content).result(binding))

I ended up using YAML::AppConfig but admittedly that's not a YAML solution but a Perl specific solution. It allows for YAML to include $vars which are interpolated.

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