Custom coercion for an EmbeddedValue?

[namelessjon]

At the moment, if you have a Virtus object acting as an Embedded Value, you can't do any kind of custom coercion. Or even invoke the constructor, unless you pass in a hash. For example:

require 'virtus'

class Ability
  include Virtus

  attribute :rating, Integer, :default => 0
  attribute :favoured, Boolean, :default => false

  def initialize(rating_or_hash)
    if Integer === rating_or_hash
      self.rating = rating_or_hash
    else
      super
    end
  end
end

p Ability.new(1)
#=> #<Ability:0x1f01760 @rating=1>
p Ability.new(:rating => 1, :favoured => true)
#=> #<Ability:0x1f09380 @rating=1, @favoured=true>

class Character
  include Virtus

  attribute :driving, Ability
end

c = Character.new(:driving => 1)
p c
#=> #<Character:0x1c8c540 @driving=1>

c = Character.new(:driving => {:rating => 1})
p c
#=> #<Character:0x1c8b2b0 @driving=#<Ability:0x1c8b190 @rating=1>>

It would be helpful if in the Character.new(:driving => 1) case, the one could still be cast to an Ability. Perhaps via a custom coercion method? I'm not immediately sure how the best way to go about this would be.

[solnic]

@namelessjon I would appreciate an integration spec showing the expected behavior

Also, are you saying it's not possible to override a virtus model constructor?

[namelessjon]

@solnic I'll try and work one up. I do need to think about this a little more. It might be that what I actually want is a custom writer or coercer.

No, that does work in the general case. However, unless you pass a hash (or hash-ish?) to the EV, the constructor is never seen.