ruby on rails - What is the rule for multiple methods(?) on and object (i.e. num.to_s.chars.map{|x| x.to_i**2}.join.to_i)? - Stack Overflow
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Using group throws undefined method `to_i' for {1=>1, 14=>1}:Hash Did you mean? to_s · Issue #2041 · rmosolgo/graphql-ruby · GitHub
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