Starting with has_defaults 0.4.2, default values that are lambdas are no longer called with the current object as argument, but instance_exec'd instead.

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This means you can now use dagger lambdas like this:

has_defaults :full_name => -> { "#{first_name} #{last_name}" }

You can also use lambda and proc as long as you don't take parameters:

has_defaults :full_name => lambda { "#{first_name} #{last_name}" }
has_defaults :full_name => proc { "#{first_name} #{last_name}" }

You can no longer write this:

has_defaults :full_name => lambda { |person| "#{person.first_name} #{person.last_name}" }