Class: DimensionsValidator

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

Constant Summary collapse

AVAILABLE_CHECKS = 
[:less_than, :less_than_or_equal_to, :greater_than, :greater_than_or_equal_to, :equal_to]

Instance Method Summary collapse

Instance Method Details

#check_validity! ⇒ Object 



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# File 'lib/image_validators/dimensions_validator.rb', line 53

def check_validity!
  unless (AVAILABLE_CHECKS).any? { |argument| options.has_key?(argument) }
    raise ArgumentError, "You must pass either :less_than, :less_than_or_equal_to, :greater_than, :greater_than_or_equal_to, or :equal_to to the validator"
  end
end

#meet_constraints(operation, image_dimension, threshold) ⇒ Object 



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# File 'lib/image_validators/dimensions_validator.rb', line 6

def meet_constraints(operation, image_dimension, threshold)
  return true unless threshold

  case operation
  when :less_than
    return image_dimension < threshold
  when :less_than_or_equal_to
    return image_dimension <= threshold
  when :greater_than
    return image_dimension > threshold
  when :greater_than_or_equal_to
    return image_dimension >= threshold
  when :equal_to
    return image_dimension == threshold
  else
    raise ArgumentError, "You must pass either :less_than, :less_than_or_equal_to, :greater_than, :greater_than_or_equal_to, or :equal_to to the validator"
  end
end

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/image_validators/dimensions_validator.rb', line 25

def validate_each(record, attribute, value)
  if record.send("#{attribute}?".to_sym) and value.queued_for_write[:original]
    dimensions = Paperclip::Geometry.from_file(value.queued_for_write[:original].path)

    options.slice(*AVAILABLE_CHECKS).each do |operation, params|
      width = params[:width]
      height = params[:height]

      # Width
      if (not meet_constraints(operation, dimensions.width.to_i, width))
        record.errors[attribute] <<
            (options[:message] || I18n.t('image_validators.errors.' + operation.to_s + '.width',
                                         default: "width must be "  + operation.to_s.humanize.downcase + " %{width}px",
                                         width:  width))
      end

      # Height
      if (not meet_constraints(operation, dimensions.height.to_i, height))
        record.errors[attribute] <<
            (options[:message] || I18n.t('image_validators.errors.' + operation.to_s + '.height',
                                         default: "height must be " + operation.to_s.humanize.downcase + " %{height}px",
                                         height: width))
      end

    end
  end
end