Class: DimensionsValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/aspecta.rb

Constant Summary collapse

DIMENSIONS = 
[:width, :height]
ATTRIBUTES = 
{ :minimum => :>=, :maximum => :<= }
MESSAGES = 
{
  :width => {
    :minimum => :image_is_too_narrow,
    :maximum => :image_is_too_wide
  },
  :height => {
    :minimum => :image_is_too_short,
    :maximum => :image_is_too_tall
  }
}

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/aspecta.rb', line 18

def validate_each(record, attribute, value)
  return if value.file.nil?

  if options.empty?
    raise ArgumentError, "Specify the :width and / or :height option"
  end

  DIMENSIONS.each do |dimension|
    unless options[dimension].nil?
      if (ATTRIBUTES.keys & options[dimension].keys).empty?
        raise ArgumentError,
          "Specify the :minimum and / or :maximum option for :#{dimension}"
      end
    end
  end

  dimensions = FastImage.size value.path

  if dimensions.nil?
    record.errors.add(attribute, :invalid)
  else
    DIMENSIONS.each_with_index do |dimension, index|
      next if options[dimension].nil?

      options[dimension].each do |measure, size|
        unless dimensions[index].send(ATTRIBUTES[measure], size)
          record.errors.add(attribute,
            MESSAGES[dimension][measure],
            :size => size
          )
        end
      end
    end
  end
end