discourse/lib/validators/unique_among_validator.rb

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