active model/support 4.1 upgrade errors for Her

gistfile1.txt

Her::Model::Associations .....................................FFFFFF....
  1) Her::Model::Associations object returned by the association method doesnt mask the object's basic methods
     Failure/Error: Foo::User.new.tap { |user| user.role = associated_value }
     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # ./lib/her/model/associations/association.rb:47:in `fetch'
     # ./lib/her/model/associations/association_proxy.rb:18:in `is_a?'
     # ./lib/her/model/associations/association_proxy.rb:47:in `method_missing'
     # ./lib/her/model/attributes.rb:192:in `role='
     # ./lib/her/model/attributes.rb:78:in `method_missing'
     # ./spec/model/associations_spec.rb:306:in `block (4 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:306:in `tap'
     # ./spec/model/associations_spec.rb:306:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:309:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:312:in `block (3 levels) in <top (required)>'
  2) Her::Model::Associations object returned by the association method doesnt mask core methods like extend
     Failure/Error: Foo::User.new.tap { |user| user.role = associated_value }
     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # ./lib/her/model/associations/association.rb:47:in `fetch'
     # ./lib/her/model/associations/association_proxy.rb:18:in `is_a?'
     # ./lib/her/model/associations/association_proxy.rb:47:in `method_missing'
     # ./lib/her/model/attributes.rb:192:in `role='
     # ./lib/her/model/attributes.rb:78:in `method_missing'
     # ./spec/model/associations_spec.rb:306:in `block (4 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:306:in `tap'
     # ./spec/model/associations_spec.rb:306:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:309:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:317:in `block (3 levels) in <top (required)>'
  3) Her::Model::Associations object returned by the association method can return the association object
     Failure/Error: Foo::User.new.tap { |user| user.role = associated_value }
     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # ./lib/her/model/associations/association.rb:47:in `fetch'
     # ./lib/her/model/associations/association_proxy.rb:18:in `is_a?'
     # ./lib/her/model/associations/association_proxy.rb:47:in `method_missing'
     # ./lib/her/model/attributes.rb:192:in `role='
     # ./lib/her/model/attributes.rb:78:in `method_missing'
     # ./spec/model/associations_spec.rb:306:in `block (4 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:306:in `tap'
     # ./spec/model/associations_spec.rb:306:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:309:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:322:in `block (3 levels) in <top (required)>'
  4) Her::Model::Associations object returned by the association method still can call fetch via the association
     Failure/Error: Foo::User.new.tap { |user| user.role = associated_value }
     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # ./lib/her/model/associations/association.rb:47:in `fetch'
     # ./lib/her/model/associations/association_proxy.rb:18:in `is_a?'
     # ./lib/her/model/associations/association_proxy.rb:47:in `method_missing'
     # ./lib/her/model/attributes.rb:192:in `role='
     # ./lib/her/model/attributes.rb:78:in `method_missing'
     # ./spec/model/associations_spec.rb:306:in `block (4 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:306:in `tap'
     # ./spec/model/associations_spec.rb:306:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:309:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:326:in `block (3 levels) in <top (required)>'
  5) Her::Model::Associations object returned by the association method calls missing methods on associated value
     Failure/Error: Foo::User.new.tap { |user| user.role = associated_value }
     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # ./lib/her/model/associations/association.rb:47:in `fetch'
     # ./lib/her/model/associations/association_proxy.rb:18:in `is_a?'
     # ./lib/her/model/associations/association_proxy.rb:47:in `method_missing'
     # ./lib/her/model/attributes.rb:192:in `role='
     # ./lib/her/model/attributes.rb:78:in `method_missing'
     # ./spec/model/associations_spec.rb:306:in `block (4 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:306:in `tap'
     # ./spec/model/associations_spec.rb:306:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:309:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:330:in `block (3 levels) in <top (required)>'
  6) Her::Model::Associations object returned by the association method can use association methods like where
     Failure/Error: Foo::User.new.tap { |user| user.role = associated_value }
     NoMethodError:
       undefined method `empty?' for nil:NilClass
     # ./lib/her/model/associations/association.rb:47:in `fetch'
     # ./lib/her/model/associations/association_proxy.rb:18:in `is_a?'
     # ./lib/her/model/associations/association_proxy.rb:47:in `method_missing'
     # ./lib/her/model/attributes.rb:192:in `role='
     # ./lib/her/model/attributes.rb:78:in `method_missing'
     # ./spec/model/associations_spec.rb:306:in `block (4 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:306:in `tap'
     # ./spec/model/associations_spec.rb:306:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:309:in `block (3 levels) in <top (required)>'
     # ./spec/model/associations_spec.rb:334:in `block (3 levels) in <top (required)>'