def is_followed_by?(users)
      user_ids = users.map(&:id).join(',')
      url = "#{@path}/followers/contains?ids=#{user_ids}"

      users_credentials = if User.class_variable_defined?('@@users_credentials')
        User.class_variable_get('@@users_credentials')
      end

      auth_users = users.select do |user|
        users_credentials[user.id]
      end if users_credentials

      if auth_users && auth_users.any?
        User.oauth_get(auth_users.first.id, url)
      else
        RSpotify.get(url)
      end
    end
def is_followed_by?(users)
      user_ids = users.map(&:id).join(',')
      url = "#{@path}/followers/contains?ids=#{user_ids}"

      users_credentials = if User.class_variable_defined?('@@users_credentials')
        User.class_variable_get('@@users_credentials')
      end

      auth_users = users.select do |user|
        users_credentials[user.id]
      end if users_credentials

      if auth_users && auth_users.any?
        User.oauth_get(auth_users.first.id, url)
      else
        RSpotify.get(url)
      end
    end
Check if one or more Spotify users are following a specified playlist. Checking if the user is privately
 following a playlist is only possible if he/she has granted access to the *playlist-read-private* scope.

 @param users [Array<User>] The users to check. Maximum: 5.
 @return [Array<Boolean>]

 @example
           user1 = RSpotify::User.find('<some-id>')
           user2 = RSpotify::User.find('<some-other-id>')
           playlist.is_followed_by?([user1, user2]) #=> [true, true] (Users publicly following playlist)

           oauth-user = RSpotify::User.new(request.env['omniauth.auth']) # (See OAuth section in readme)
           playlist.is_followed_by?([oauth-user]) #=> [true] (User publicly or privately following playlist)