Cfrgtkky

TLDR: A hash extension works flawlessly, returning the desired output, when included locally in my Mailer, but always returns nil when imported from a module in lib/, even though the class method is successfully loaded.

When I declare the extension in my mailer.rb file, before my class definition, as in:

class Hash

  def try_deep(*fields)

    ...

  end

end



class MyMailer < ApplicationMailer

  some_hash.try_deep(:some_key)

end

it works flawlessly, but this is bad practice. I thought it better to declare the extension in /lib/core_ext/hash/try_deep.rb and then require it in the Mailer, as in:

/lib/core_ext/hash/try_deep.rb:

module CoreExtensions

  module Hash

    module TryDeep

      def try_deep(*fields)

        ...

      end

    end

  end

end

/my_mailer.rb:

require 'core_ext/hash/try_deep'



class MyMailer < ApplicationMailer

  Hash.include CoreExtensions::Hash::TryDeep

  some_hash.try_deep(:some_key)

end

You need to inject your custom method into Hash outside of your class:

my_mailer.rb:

require 'core_ext/hash/try_deep'



class Hash

  include CoreExtensions::Hash::TryDeep

end



class MyMailer < ApplicationMailer

  some_hash.try_deep(:some_key)

end