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Comparison of Date with nil failed - ruby

I am running code like this:

if valid_from > Date.today

and when i run this i get the error

date comparison with nil failed

I assume this is happening because in some cases valid_from

there is nil

. Is there a way to avoid this error?

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3 answers


You can do:

if valid_from and valid_from > Date.today
  ...
end


That there will be a short circuit in the first clause, because valid_from is nil and therefore false.

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Another option is to convert both to integer

if valid_from.to_i > Date.today.to_i


(nil converts to 0 and never exceeds the current date)

The advantage is that it is shorter and does not need treatment for an additional case. Disadvantage: Failure at the beginning of the second stage (may be negligible for a large number of scenarios)

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I like to do it this way: valid_from && valid_from > Date.today

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