Class: UniqueAmongValidator

Inherits:
ActiveRecord::Validations::UniquenessValidator
  • Object
show all
Defined in:
lib/validators/unique_among_validator.rb

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/validators/unique_among_validator.rb', line 4

def validate_each(record, attribute, value)
  old_errors = []
  record.errors.each { |error| old_errors << error if error.attribute == attribute }

  # look for any duplicates at all
  super

  new_errors = []
  record.errors.each { |error| new_errors << error if error.attribute == attribute }

  # 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 { |error| record.errors.add(error.attribute, error.type, **error.options) }
    end
  end
end