Class: DynamicLengthValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
app/validators/dynamic_length_validator.rb

Overview

Validates that value of attribute on record is meets the record.dynamic_length_validation_options(attribute).

Works similar to LengthValidator, but the minimum and maximum lengths are controlled dynamically by the record to allow the validation to vary based on some other attribute in the record.

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ void

This method returns an undefined value.

Validates that value's #length meets the minimum and maximum options in record.dynamic_length_validation_options(attribute).

Parameters:

  • record (Object, #dynamic_length_validation_options) —

    record that supports dynmaic length options on attribute.

  • attribute (Symbol) —

    name of an attribute on record with the given value.

  • value (Object, #length) —

    value of attribute.



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# File 'app/validators/dynamic_length_validator.rb', line 15

def validate_each(record, attribute, value)
  # dynamic_options are not checked for validity the way options would be for LengthValidator because
  # dynamic_length_validation_options can be {} in some cases.
  dynamic_options = record.dynamic_length_validation_options(attribute)
  value_length = value.length

  ActiveModel::Validations::LengthValidator::CHECKS.each do |key, validity_check|
    check_value = dynamic_options[key]

    if check_value
      unless value_length.send(validity_check, check_value)
        errors_options = dynamic_options.except(*ActiveModel::Validations::LengthValidator::RESERVED_OPTIONS)
        errors_options[:count] = check_value

        message = errors_options[:message]
        message_key = ActiveModel::Validations::LengthValidator::MESSAGES[key]

        unless message
          default_message = dynamic_options[message_key]

          if default_message
            errors_options[:message] = default_message
          end
        end

        record.errors.add(attribute, message_key, errors_options)
      end
    end
  end
end