Question

I have some code:

  in_msg.updateComments.map{|c| c.values}.each do |comment|
    ...
  end

where in_msg.updateComments is a hash. For some reason the first line if this snippet returns an error:

NoMethodError: undefined method `values' for #<Array:0x1382da058>

I am not sure why this happens. Any idea why it might happen and how to fix it?

Answer 1

The map method returns an Enumerator, which is going to loop over each key value pair in your hash, but it yields an array, not a hash, so c will look like [key, value] instead of {key => value}.

Array doesn’t implement values, which is why you are getting the error.