void ReadDataSourceOptions()

in firestore/android/FirestoreSnippetsCpp/app/src/main/cpp/snippets.cpp [510:544]

• 21 lines of code
• 3 McCabe index (conditional complexity)

void ReadDataSourceOptions(firebase::firestore::Firestore* db) {
  using firebase::Future;
  using firebase::firestore::DocumentReference;
  using firebase::firestore::DocumentSnapshot;
  using firebase::firestore::Error;
  using firebase::firestore::FieldValue;
  using firebase::firestore::Source;

  // You can set the source option to control how a get call uses the offline
  // cache.
  //
  // By default, a get call will attempt to fetch the latest document snapshot
  // from your database. On platforms with offline support, the client library
  // will use the offline cache if the network is unavailable or if the request
  // times out.
  //
  // You can specify the source option in a Get() call to change the default
  // behavior. You can fetch from only the database and ignore the offline
  // cache, or you can fetch from only the offline cache. For example:
  // [START get_document_options]
  DocumentReference doc_ref = db->Collection("cities").Document("SF");
  Source source = Source::kCache;
  doc_ref.Get(source).OnCompletion([](const Future<DocumentSnapshot>& future) {
    if (future.error() == Error::kErrorOk) {
      const DocumentSnapshot& document = *future.result();
      if (document.exists()) {
        std::cout << "Cached document id: " << document.id() << std::endl;
      } else {
      }
    } else {
      std::cout << "Cached get failed: " << future.error_message() << std::endl;
    }
  });
  // [END get_document_options]
}