class NestedAttributesOrderValidator

# File lib/nested_attributes_validator/active_model/validations/nested_attributes_order_validator.rb, line 4
def validate_each(record, _attribute, values)
  trg_fields = target_fields

  trg_values = target_values(trg_fields, values)
  if trg_fields.size == 1
    trg_values.keys.each {|k| trg_values[k] = trg_values[k].first}
  end

  trg_values.each_cons(2) do |(v1, f1), (v2, f2)|
    condition = options[:condition] || lambda {|a, b| a < b}
    is_valid = condition.call(f1, f2)

    unless is_valid
      trg_fields.each do |field|
        # set error to the parent record
        attribute_name = :"#{attributes.first}.#{options[:display_field] || field}"
        record.errors[attribute_name] << I18n.t('errors.messages.nested_attributes_invalid_order')
        record.errors[attribute_name].uniq!

        # also set error to the child record to apply "field_with_errors"
        v1.errors.add(field , nil)
        v2.errors.add(field , nil)
      end
    end
  end
end