On page 166, in the file lib/pento/catalog/product.ex, the example code instructs the reader to use the following import statement: alias Pento.Catalog.Rating.
This produces an error in ElixirLS because the Rating module is not located in the Pento.Catalog module namespace. The error reads: invalid association ratings in schema Pento.Catalog.Product: associated schema Rating does not exist (Elixir)
The import statement should be corrected to read: alias Pento.Survey.Rating