Is there a way we can access the external_id from SSO record of another user?

[simon]

I think it would be something like:

# in the plugin's after_initialize block
after_initialize do

# Edit: probably also check to make sure that `SiteSetting.enable_discourse_connect` returns `true`
  add_to_serializer(:user, :external_id) {object&.single_sign_on_record&.external_id}
end

The external_id is a property of the single_sign_on_record not the user. I remember this because I had something to do with:

app/serializers/current_user_serializer.rb