UseCase_FoodDelivery_RubySDK_get_itemrec_top_n.rb

# You need to specify the name of the engine from which you want to retrieve the prediction results. 
# Add the following code to display recommended meals to the user after the user has logged in:
begin
  # Retrieve top 5 recommended meals from the item recommendation engine.
  # Assuming client.identify("user id") is already called when the user logged in.
  iids = client.get_itemrec_top_n("the engine name", 5) # list of recommended meal IDs
rescue ItemRecNotFoundError => e
  iids = get_default_iids_list(5) # default behavior when there is no prediction result, e.g. recommends newest meals
  log_error(e) # log the error for debugging or analysis later
end

display_meals(iids) # display meals to the user