Ruby on Rails

Now giving error:
undefined method `key' for #<Question:0x007fdff26b7798>

In Question model:
before_validation :capitalize_first_words

def capitalize_first_words
[:question, :correct_ans_1, :correct_ans_2, :correct_ans_3].each
do |key|

self.key = self.key.gsub(/^(\W*?[a-z])/) { |m| m.upcase } if
!self.key.blank?
end
end

Am I missing something really quite simple?

Thanks

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