How do I use variables in a YAML file?

Question

I have YAML file which needs to take a variable as an input:

outputters:
    - type        : DateFileOutputter
      name        : logfile
      level       : DEBUG
      date_pattern: '%Y%m%d'
      trunc       : 'false'
      dirname     : "/home/sameera/workspace/project/log"
      filename    : "message.log"
      formatter   :
        date_pattern: '%m/%d/%Y %H:%M:%S'
        pattern     : '%d %l - %m'
        type        : PatternFormatter

I want to pass dirname as a parameter, something like:

      dirname     : "<%= LOGFILE_PATH%>"

My LOGFILE_PATH is defined in a file called init.rb.

**See also:** https://stackoverflow.com/questions/41620674 – dreftymac Aug 10 '18 at 21:26 — dreftymac, Aug 10 '18 at 21:26

Sergio Tulentsev · Accepted Answer · 2012-01-04T09:29:14.597

22

You could use ERB.

For example:

template = ERB.new File.new("path/to/config.yml.erb").read
processed = YAML.load template.result(binding)

You can read more on binding here: ruby metaprogramming.

edited Jan 04 '12 at 09:29

answered Jan 04 '12 at 06:39

Sergio Tulentsev

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Hi @Sergio Tulentsev, It it worked, But since I wanted a pure yml solution, I tried to do the same with .yml but had no luck, thanks for the answer and sorry for the delay of not posting any update cheers sameera – sameera207 Jan 07 '12 at 06:13
@Sergio Tulentsev have you fixed this problem in any other way?(i.e based on yml) – Manivannan Jeganathan Aug 26 '13 at 16:11
@ManivannanJeganathan: I didn't try :) – Sergio Tulentsev Aug 27 '13 at 06:23

How do I use variables in a YAML file?

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