Contents

class SumOfValidator < ActiveModel::EachValidator
  def check_validity!
    unless options[:attr_names]
      raise ArgumentError, "must supply :attr_names option"
    end
  end

  def validate_each(record, attribute, value)
    addends = options[:attr_names].map {|_| record[_] }
    return if value.blank? || addends.any?(&:blank?)
    sum = addends.sum
    unless value == sum
      record.errors.add(attribute, options[:message] || :sum_of,
                        options.merge(
                          attr_names: options[:attr_names].to_sentence,
                          addends: addends.join(' + '),
                          sum: sum,
                          value: value,
                        )
      )
    end
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
activemodel-validators-1.2.0	lib/activemodel-validators/sum_of_validator.rb
activemodel-validators-1.1.0	lib/activemodel-validators/sum_of_validator.rb
activemodel-validators-1.0.0	lib/activemodel-validators/sum_of_validator.rb