ActiveStorage::Util

util.rb

module ActiveStorage
  module Util
    class << self
      def image(resource, **options)
        return '/no_image.png' unless resource.attached?

        size = handle_size?(options)
        return resource.service_url unless size

        resource.variant(resize_to_fill: size).processed.service_url
      end

      private

      def handle_size?(options)
        if options[:width].present? || options[:height].present?
          raise Errors::NotImplemented, 'Wrong parameters' if !options[:width].present? || !options[:height].present?

          return [options[:width], options[:height]]
        end

        return size(options[:size]) if options[:size].present?

        false
      end

      def size(size)
        size = size.to_sym if size.is_a?(String)
        case size
        when :thumb
          [100, '100>']
        when :square
          [200, '200>']
        when :medium
          [300, '300>']
        else
          raise NotImplementedError
        end
      end
    end
  end
end