The second "options" hash argument to a model .new method no longer exists on Rails 5 (due to no protected_attrs support?), so Host::Managed#initialize should handle it being present or not.

The hash isn't used directly by initialize, only Rails. Host::Base already does this using a splat operator.

ArgumentError: wrong number of arguments (given 2, expected 0..1)
    activerecord (5.0.0) lib/active_record/core.rb:312:in `initialize'
    app/models/host/base.rb:82:in `initialize'
    actionpack (5.0.0) lib/action_dispatch/routing/url_for.rb:106:in `initialize'
    app/models/host/managed.rb:47:in `initialize'
    activerecord (5.0.0) lib/active_record/inheritance.rb:65:in `new'
    activerecord (5.0.0) lib/active_record/inheritance.rb:65:in `new'
    app/models/concerns/foreman/sti.rb:22:in `new_with_cast'
    app/models/host.rb:15:in `method_missing'
    factory_girl (4.7.0) lib/factory_girl/decorator/new_constructor.rb:9:in `new'