discourse/lib/validators/unique_among_validator.rb

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class UniqueAmongValidator < ActiveRecord::Validations::UniquenessValidator
def validate_each(record, attribute, value)
old_errors = record.errors[attribute].size
# look for any duplicates at all
super
new_errors = record.errors[attribute].size - old_errors
# do nothing further unless there were some duplicates.
unless new_errors == 0
# now look only in the collection we care about.
dupes = options[:collection].call.where("lower(#{attribute}) = ?", value.downcase)
dupes = dupes.where("id != ?", record.id) if record.persisted?
# pop off the error, if it was a false positive
record.errors[attribute].pop(new_errors) unless dupes.exists?
end
end
end