Rails secrets.yml，其值包含换行符

Question

Let's assume I have a config/secrets.yml file that contains:

development:
  app_name: MyApp
  secret: <%= ENV['SECRET_VALUE'] %>

If I set SECRET_VALUE with a newline, it will break. Eg:

export SECRET_VALUE=$(printf "hello\nworld")

Then when I start my rail application I get this error:

/usr/local/lib/ruby/3.0.0/psych.rb:457:in 'parse': (<unknown>): could not find expected ':' while scanning a simple key at line 4 column 1 (Psych::SyntaxError)

While debugging the issue, I realized that the literal value of ENV['SECRET_VALUE'] is added to the yaml file before parsing it . That means if I wanted to achieve what I'm trying to do, I would have to do something like:

export SECRET_VALUE=$(printf "|\n hello\n world")

This works but this is very ugly and I can't be the only one who think this behaviour is absurd?? Is there a better way to do this?

EDIT:

I tried adding quotes around the value:

development:
  app_name: MyApp
  secret: "<%= ENV['SECRET_VALUE'] %>"

It "works" but the newline gets removed from the string...

root@4e4431bae32e:/app# rails console
Loading development environment (Rails 7.0.3)
irb(main):001:0> puts ENV['SECRET_VALUE']
hello
world
=> nil
irb(main):002:0> puts Rails.application.secrets[:secret]
hello world
=> nil

It's important that the newline remains for my use case.

Answer 1

You can use an escaped quoted string. YAML's string format is similar enough to a superset of Ruby's for String#dump to work:

development:
  app_name: MyApp
  secret: <%= ENV['SECRET_VALUE'].dump %>