bgadoci bgadoci - 1 year ago 80
Ruby Question

Validating min and max length of a string but allowing it to be blank

I have a field that I would like to validate. I want the field to be able to be left blank, but if a user is entering data I want it to be in a certain format. Currently I am using the below validations in the model, but this doesn't allow the user to leave it blank:

validates_length_of :foo, :maximum => 5
validates_length_of :foo, :minimum => 5

How do I write this to accomplish my goal?

Answer Source

I think it might need something like:

validates_length_of :foo, :minimum => 5, :maximum => 5, :allow_blank => true

More examples: ActiveRecord::Validations::ClassMethods

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