AtLeastOneOfValidator doesn't provide the full name of attribute in errors

[wwahammy]

Currently, AtLeastOneOfValidator only provides the minimal attribute name on a validation error. This is different from other validators where we use the full name. As an example, let's consider the following parameters:

requires :address, type: Hash do
  requires :needed_attr
  optional :attr_1
  optional :attr_2
  at_least_one_of :attr1, :attr2
end

If address[needed_attr] isn't set, the hash key for that attribute's errors is address[needed_attr]. On the other hand, the hash key for errors on address[attr1] and address[attr2] is ['attr1', 'attr2']. This is inconsistent. Is this expected behavior? If not, I'd be willing to submit a pull request to fix it.

[dblock]

I think this is a bug, PR appreciated, thank you.