How to get the picture of Facebook User using Koala gem?

Question

I am trying to fetch the picture of a Facebook user\'s friends using their facebook ids, but using the following code returns nil instead of the picture url...

The code

Answer 1

  USER_PROFILE_OPTIONS = {
    fields: %w(id first_name last_name hometown email 
               gender birthday picture.width(320))
  }.freeze
  @graph = Koala::Facebook::API.new(oauth_access_token)
  @graph.get_object('me', USER_PROFILE_OPTIONS)

See: https://developers.facebook.com/docs/graph-api/reference/user/picture/