Ruby on Rails

But, even the following causes error: undefined method `key=' for
#<Question:0x007fcba5972f20>

before_validation :capitalize_first_words

def capitalize_first_words
[:question, :correct_ans_1, :correct_ans_2].each do|key|
self.key = "x"
end
end

key is still not being interpreted as "question" or "correct_ans_1",
ect...
Could it be a scope issue? I am in the Question model.

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