MethodQuery gives you the ability to check for the truthiness of a key via method calls. Note that it will return false if the key is set to a non-truthful value, not if the key isn't set at all. Use key? for checking if a key has been set.
MethodQuery will check against both string and symbol names of the method for existing keys. It also patches respond_to to appropriately detect the query methods.
@example
class MyHash < Hash include Hashie::Extensions::MethodQuery end h = MyHash.new h['abc'] = 123 h.abc? # => true h['def'] = nil h.def? # => false h.hji? # => NoMethodError
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