Module: AmountField::ActiveRecord::Validations::ClassMethods

Defined in:
lib/amount_field/validations.rb

Instance Method Summary collapse

Instance Method Details

#validates_amount_format_of(*attr_names) ⇒ Object 



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# File 'lib/amount_field/validations.rb', line 17

def validates_amount_format_of(*attr_names)
  # code before validates_each is called only once!
  configuration = attr_names.extract_options!

  define_special_setter(attr_names)

  # the following code defines the callbacks methods that are called on every validation
  validates_each(attr_names, configuration) do |record, attr_name, value|
    # in case there is no assignment via 'amount_field_XXX=' method, we don't need to validate.
    next unless record.instance_variable_defined?("@#{special_method_name(attr_name)}")

    # get the original assigned value first to always run the validation for this value!
    # if we us 'before_type_cast' here, we would get the converted value and not the 
    # original value if we call the validation twice.
    original_value = record.instance_variable_get("@#{special_method_name(attr_name)}")
    original_value ||= record.send("#{attr_name}_before_type_cast") || value

    # in case nil or blank is allowed, we don't validate
    next if configuration[:allow_nil] and original_value.nil?
    next if configuration[:allow_blank] and original_value.blank?

    converted_value = convert(original_value, format_configuration(configuration))

    if valid_format?(original_value, format_configuration(configuration))
      # assign converted value to attribute so other validations macro can work on it 
      # and the getter returns a value
      record.send("#{attr_name}=", converted_value)
    else  
      # assign original value as AssignedValue so multiple calls of this validation will
      # consider the value still as invalid.
      record.send("#{attr_name}=", original_value)
      record.errors.add(attr_name, 
        build_error_message(configuration[:message], {
          :value => original_value, 
          :format_example => valid_format_example(format_configuration(configuration))
        })
      )
    end  

  end
end