Extraction using case classes
In the previous sections, we extracted specific fields from the JSON response using Scala extractors. We can do one better and extract full case classes.
When moving beyond the REPL, programming best practice dictates that we move from
json4s types to Scala objects as soon as possible rather than passing
json4s types around the program. Converting from
json4s types to Scala types (or case classes representing domain objects) is good practice because:
- It decouples the program from the structure of the data that we receive from the API, something we have little control over.
- It improves type safety: a
JObjectis, as far as the compiler is concerned, always a
JObject, whatever fields it contains. By contrast, the compiler ...