How do I parse a YAML file in Ruby

Question

I would like to know how to parse a YAML file with the following contents   ---  javascripts   - fo global    - lazyload-min   - holla-min   Currently I am trying to parse it this way    custom asset packages yml    File exists     RAILS ROOT  config asset packages yml     YAML load file    RAILS ROOT  config asset packages yml     nil      if   custom asset packages yml nil         custom asset packages yml  javascripts   each   js          js  fo global   each   script           script                       end   But it doesn t seem to work and gives me an error that the value is nil   You have a nil object when you didn t expect it  You might have expected an instance of Array  The error occurred while evaluating nil each   If I try this  it puts out the entire string  fo globallazyload-minholla-min    if   custom asset packages yml nil             custom asset packages yml  javascripts   each   js              js  fo global                       end

User · Answer

I had the same problem but also wanted to get the content of the file (after the YAML front-matter).

This is the best solution I have found:

if (md = contents.match(/^(?<metadata>---\s*\n.*?\n?)^(---\s*$\n?)/m))
  self.contents = md.post_match
  self.metadata = YAML.load(md[:metadata])
end

Source and discussion: https://practicingruby.com/articles/tricks-for-working-with-text-and-files

User · Answer

Maybe I m missing something  but why try to parse the file  Why not just load the YAML and examine the object s  that result   If your sample YAML is in some yml  then this   require  yaml  thing   YAML load file  some yml   puts thing inspect   gives me     javascripts   gt    fo global   gt   lazyload-min    holla-min

User · Answer

Here is the one liner i use  from terminal  to test the content of yml file s      ruby  -r yaml -r pp  -e  pp YAML load file   Users za project application yml      logging   gt      path   gt   var logs        file   gt  TacoCloud log       level   gt        root   gt  WARN    org   gt   springframework   gt   security   gt  DEBUG

[ruby] How do I parse a YAML file in Ruby?

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