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 



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/measured/rails/validations.rb', line 14

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 = measured_config[: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, :invalid, message: 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, :invalid, message: 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, option, message: message(record, "#{measurable.to_s} must be #{CHECKS[option]} #{comparable_value}"))
      end
    end
  end
end