Fixed issue with api_concern (#406)

app/models/concerns/api_concern.rb

@@ -32,7 +32,13 @@ module APIConcern
   # Sets a BigBlueButtonApi object for interacting with the API.
   def bbb
     @bbb ||= if Rails.configuration.loadbalanced_configuration
+      if instance_of? Room
+        # currently in the Room Model
         lb_user = retrieve_loadbalanced_credentials(owner.provider)
+      elsif instance_of? User
+        # currently in the User Model
+        lb_user = retrieve_loadbalanced_credentials(provider)
+      end
       BigBlueButton::BigBlueButtonApi.new(remove_slash(lb_user["apiURL"]), lb_user["secret"], "0.8")
     else
       BigBlueButton::BigBlueButtonApi.new(remove_slash(bbb_endpoint), bbb_secret, "0.8")