<FirestoreCollection path={parentPath} >
                        {items => {
                          return items.value ? (
                            <FlatList
                              data={items.value}
                              renderItem={({ item }) => (     
                                //item.ref is a Firestore reference type
                                <FirestoreDocument path={item.ref.path}>
                                  {match => {
                                    return match.value ? (
                                      <Text>Never rendered</Text>
                                    ) : (
                                      <Text> Loading.....forever</Text>
                                    );
                                  }}
                                </FirestoreDocument>
                              )}
                            />
                          ) : (
                               <Text> Loading...</Text>
                          );
                        }}
                      </FirestoreCollection>