Use autolink twitter-text gem

track_decorator.rb

module TrackDecorator
  include Twitter::TwitterText::Autolink
  include Rails.application.routes.url_helpers

  def body
    # https://github.com/twitter/twitter-text/blob/752b9476d5ed00c2ec60d0a6bb3b34bd5b19bcf9/rb/spec/autolinking_spec.rb#L687-L689
    html = auto_link_hashtags(raw_body, { :hashtag_url_block => lambda { |url| project_path(self.project) } , hashtag_class: 'Label Label--gray'})
    raw html
  end
end