I'm trying to set up validations for a couple of my models, and would like
to use a custom error message. However, sequel validations add the column
name before the message.
So if I do a validates_unique on the :username column, it will say
'username is taken' or whatever the message is I specify. I'd like to
remove the username part of it and just return :message.
I saw an example in the docs for 'errors.add(:name, Sequel.lit("Album name
is not valid"))' but that seems like a mass solution with no way to limit
it to a validates_unique error. I'd only want to do it for some columns.
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