Class: MeasuredValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/measured/rails/validations.rb

Constant Summary collapse

CHECKS = 
{
  greater_than: :>,
  greater_than_or_equal_to: :>=,
  equal_to: :==,
  less_than: :<,
  less_than_or_equal_to: :<=,
}.freeze

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, measurable) ⇒ Object 



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# File 'lib/measured/rails/validations.rb', line 11

def validate_each(record, attribute, measurable)
  measured_config = record.class.measured_fields[attribute]
  unit_field_name = measured_config[:unit_field_name] || "#{ attribute }_unit"
  value_field_name = "#{ attribute }_value"

  measured_class = measured_config[:class]

  measurable_unit_name = record.public_send(unit_field_name)
  measurable_value = record.public_send(value_field_name)

  return unless measurable_unit_name.present? || measurable_value.present?

  measurable_unit = measured_class.unit_system.unit_for(measurable_unit_name)
  record.errors.add(attribute, message(record, "is not a valid unit")) unless measurable_unit

  if options[:units] && measurable_unit.present?
    valid_units = Array(options[:units]).map { |unit| measured_class.unit_system.unit_for(unit) }
    record.errors.add(attribute, message(record, "is not a valid unit")) unless valid_units.include?(measurable_unit)
  end

  if measurable_unit && measurable_value.present?
    options.slice(*CHECKS.keys).each do |option, value|
      comparable_value = value_for(value, record)
      comparable_value = measured_class.new(comparable_value, measurable_unit) unless comparable_value.is_a?(Measured::Measurable)
      unless measurable.public_send(CHECKS[option], comparable_value)
        record.errors.add(attribute, message(record, "#{measurable.to_s} must be #{CHECKS[option]} #{comparable_value}"))
      end
    end
  end
end