works_and_worksnot.rb

# For future reference

# ActiveRecord
class Doc < ActiveRecord::Base
  before_save do
    # i am a proc, I have self as a reference to the object
    self.attribute_x = nil
  end
  
  before_save { |x|
    # i am a proc with 1 argument, x is the reference to the object
    x.attribute = nil
  }
  
  before_save ->(x) {
    # i am a Lambda with 1 argument... I am also Hartogs favorite notation
  }
end

# The above all work as as expected

class RippleDoc
  include Ripple::Document
  
  before_save do
    # i am the proc - I work
  end
  
  before_save do |x|
    # i am a proc with argument, I do not work
  end
  
  before_save ->(x) {
    # I am lambda, lambda, lambda. I function not
  }
end