void QuickstartAddData()

in firestore/android/FirestoreSnippetsCpp/app/src/main/cpp/snippets.cpp [67:116]
32 lines of code
3 McCabe index (conditional complexity)

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

  // Firestore stores data in Documents, which are stored in Collections.
  // Firestore creates collections and documents implicitly the first time
  // you add data to the document. You do not need to explicitly create
  // collections or documents.

  // [START add_ada_lovelace]
  // Add a new document with a generated ID
  Future<DocumentReference> user_ref =
      db->Collection("users").Add({{"first", FieldValue::String("Ada")},
                                   {"last", FieldValue::String("Lovelace")},
                                   {"born", FieldValue::Integer(1815)}});

  user_ref.OnCompletion([](const Future<DocumentReference>& future) {
    if (future.error() == Error::kErrorOk) {
      std::cout << "DocumentSnapshot added with ID: " << future.result()->id()
                << std::endl;
    } else {
      std::cout << "Error adding document: " << future.error_message() << std::endl;
    }
  });
  // [END add_ada_lovelace]

  // Now add another document to the users collection. Notice that this document
  // includes a key-value pair (middle name) that does not appear in the first
  // document. Documents in a collection can contain different sets of
  // information.

  // [START add_alan_turing]
  db->Collection("users")
      .Add({{"first", FieldValue::String("Alan")},
            {"middle", FieldValue::String("Mathison")},
            {"last", FieldValue::String("Turing")},
            {"born", FieldValue::Integer(1912)}})
      .OnCompletion([](const Future<DocumentReference>& future) {
        if (future.error() == Error::kErrorOk) {
          std::cout << "DocumentSnapshot added with ID: "
                    << future.result()->id() << std::endl;
        } else {
          std::cout << "Error adding document: " << future.error_message()
                    << std::endl;
        }
      });
  // [END add_alan_turing]
}