Module: DateTimeAttributeValidate::ClassMethods

Defined in:
app/lib/date_time_attribute_validate.rb

Instance Method Summary collapse

Instance Method Details

#date_time_attribute(*attributes) ⇒ Object 



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# File 'app/lib/date_time_attribute_validate.rb', line 9

def date_time_attribute(*attributes)
  super

  attributes.each do |attribute|
    validate -> { send("#{attribute}_datetime_value_valid") }

    # allow resetting the field to nil
    before_validation do
      if instance_variable_get("@#{attribute}_is_set")
        date = instance_variable_get("@#{attribute}_date_value")
        time = instance_variable_get("@#{attribute}_time_value")
        send("#{attribute}=", nil) if date.blank? && time.blank?
      end
    end

    # remember old date and time values
    define_method("#{attribute}_date_value=") do |val|
      instance_variable_set("@#{attribute}_is_set", true)
      instance_variable_set("@#{attribute}_date_value", val)
      begin
        send("#{attribute}_date=", val)
      rescue StandardError
        nil
      end
    end
    define_method("#{attribute}_time_value=") do |val|
      instance_variable_set("@#{attribute}_is_set", true)
      instance_variable_set("@#{attribute}_time_value", val)
      begin
        send("#{attribute}_time=", val)
      rescue StandardError
        nil
      end
    end

    # fallback to field when values are not set
    define_method("#{attribute}_date_value") do
      instance_variable_get("@#{attribute}_date_value") || send("#{attribute}_date").try do |e|
        e.strftime('%Y-%m-%d')
      end
    end
    define_method("#{attribute}_time_value") do
      instance_variable_get("@#{attribute}_time_value") || send("#{attribute}_time").try do |e|
        e.strftime('%H:%M')
      end
    end

    private

    # validate date and time
    define_method("#{attribute}_datetime_value_valid") do
      date = instance_variable_get("@#{attribute}_date_value")
      unless date.blank? || begin
        Date.parse(date)
      rescue StandardError
        nil
      end
        errors.add(attribute, 'is not a valid date') # @todo I18n
      end
      time = instance_variable_get("@#{attribute}_time_value")
      unless time.blank? || begin
        Time.parse(time)
      rescue StandardError
        nil
      end
        errors.add(attribute, 'is not a valid time') # @todo I18n
      end
    end
  end
end