ruby on rails - block in assert_valid_keys: Unknown key: :optional (ArgumentError) -


upon pushing latest commit heroku, i've been recieving error, , can't seem find it's coming from:

app[web.1]: /app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.5.1/lib/active_support/core_ext/hash/keys.rb:75:in `block in assert_valid_keys': unknown key: :optional. valid keys are: :class_name, :anonymous_class, :foreign_key, :validate, :autosave, :dependent, :primary_key, :inverse_of, :required, :foreign_type, :polymorphic, :touch, :counter_cache (argum enterror)

can't seem figure out why recieving error when in development doesn't occur. ideas?


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