The WeatherDao returns the data you want and you could have the DetailActivityViewModel communicate directly with the WeahterDao. But that defeats the whole point of the repository class; the repository should be the single source of truth for all data operations. Therefore the DetailActivityViewModel will get this data from the SunshineRepository. The SunshineRepository will, in turn, ask the WeatherDao for the LiveData:
There is a typo in https://codelabs.developers.google.com/codelabs/build-app-with-arch-components/index.html?index=..%2F..%2Findex#11: