Undefined method 'first?' for YAML::Any when using YAML::Schema::FailSafe.parse

[SeedyROM]

I'm trying to parse a YAML file with the FailSafe parser, however my perfectly valid .yml file somehow throws the error above.

YAML:

context:
    replace_me: "Yes please!"

Code:

require "yaml"

file = File.read "./config.yml"
yaml = YAML::Schema::FailSafe.parse file

Traceback:

in /usr/lib/crystal/yaml/schema/fail_safe.cr:7: instantiating 'YAML::Schema::FailSafe::Parser.class#new(String)'

    Parser.new data, &.parse
           ^~~

in /usr/lib/crystal/yaml/schema/fail_safe.cr:7: instantiating 'YAML::Schema::FailSafe::Parser.class#new(String)'

    Parser.new data, &.parse
           ^~~

in /usr/lib/crystal/yaml/schema/fail_safe.cr:7: instantiating 'YAML::Schema::FailSafe::Parser#parse()'

    Parser.new data, &.parse
                       ^~~~~

in /usr/lib/crystal/yaml/parser.cr:65: instantiating 'cast_document(YAML::Any)'

    cast_document(document)
    ^~~~~~~~~~~~~

in /usr/lib/crystal/yaml/schema/fail_safe.cr:38: undefined method 'first?' for YAML::Any

      doc.first? || Any.new(nil)

[wooster0]

Here's a workaround for now:

module YAML::Schema::FailSafe
  class Parser < YAML::Parser
    def cast_document(doc)
      doc[0]? || Any.new(nil)
    end
  end
end

[SeedyROM]

Interesting! I'll have to check that out. I achieved my goal by using doc.as_a.first?. But then again I wasn't parsing multiple documents, however I found the default YAML parser did exactly what I wanted anyway.

Although the presence of this bug is worth noting!

[SeedyROM]

Maybe I was being too Rubyist about my style with that considering the conversion to an Array.

doc[0]? || ... will definitely work as intended!