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

Question

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 us

Answer 1

Add in your model:

validates :color, length: { is: 7 }

color is a string:

t.string :color, null: false, default: '#0093FF', limit: 7