Rails 5.1 oddities for class attribute default not set.

[metaskills]

MyJob.perform_later(key)
irb(main):009:0> end
Traceback (most recent call last):
        3: from (irb):7
        2: from (irb):7:in `each'
        1: from (irb):8:in `block in irb_binding'
NoMethodError (undefined method `[]' for nil:NilClass)