Module: DateTimeAttributeValidate::ClassMethods

Defined in:
lib/date_time_attribute_validate.rb

Instance Method Summary collapse

Instance Method Details

#date_time_attribute(*attributes) ⇒ Object


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# File 'lib/date_time_attribute_validate.rb', line 10

def date_time_attribute(*attributes)
  super

  attributes.each do |attribute|

    validate "#{attribute}_datetime_value_valid"

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

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

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

    private

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

  end
end