Question

我正在Firestore中添加一个新文档。当我回到显示那些文档列表的活动中添加了新文档后，我的应用程序崩溃并出现以下错误。在我的查询中，我正在订购带有服务器时间戳的文档。

java.lang.IllegalArgumentException：无效的查询。您正在尝试使用字段所在的文档开始或结束查询 “ additionTime”是未提交的服务器时间戳。（由于此字段是未知的，您不能使用它开始/结束查询。）在com.google.firebase.firestore.Query.boundFromDocumentSnapshot（com.google.firebase：firebase-firestore @@ 21.0.0：742）在com.google.firebase.firestore.Query.startAfter（com.google.firebase：firebase-firestore @@ 21.0.0：632）在com.firebase.ui.firestore.paging.PageKey.getPageQuery（PageKey.java:29）在com.firebase.ui.firestore.paging.FirestoreDataSource.loadAfter（FirestoreDataSource.java:106）在androidx.paging.PageKeyedDataSource.dispatchLoadAfter（PageKeyedDataSource.java:338）在androidx.paging.ContiguousPagedList $ 3.run（ContiguousPagedList.java:228）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1133）在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:607）在java.lang.Thread.run（Thread.java:761）

仅在我添加第一个文档时发生。我的POJO班在这里

public class BookLight implements Serializable {

    private String bookId;
    private String bookName;
    private String authors;
    private float rating;
    private String category;
    private String thumbnail;
    private BookState bookState;
    private String ownerID;

    @ServerTimestamp
    private Date additionTime;



    public BookLight(){

    }

    //other getters and settes
    public Date getAdditionTime() {
        return additionTime;
    }

    public void setAdditionTime(Date additionTime) {
        this.additionTime = additionTime;
    }


}

我在这里使用FirestorePagingAdapter来显示那些项目

private FirestorePagingAdapter<BookLight, BookViewHolder> mAdapter;

private void loadData(){
                query= FirebaseFirestore.getInstance()
                        .collection("Groups")
                        .document(groupDetails.getGroupID())
                        .collection("books")
                        .orderBy("additionTime",Query.Direction.DESCENDING);

                PagedList.Config config = new PagedList.Config.Builder()
                        .setEnablePlaceholders(false)
                        .setPrefetchDistance(5)
                        .setPageSize(3)
                        .build();

                FirestorePagingOptions<BookLight> options = new FirestorePagingOptions.Builder<BookLight>()
                        .setLifecycleOwner(this)
                        .setQuery(query, config, BookLight.class)
                        .build();

                mAdapter = new FirestorePagingAdapter<BookLight, BookViewHolder>(options) {
                    @NonNull
                    @Override
                    public BookViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
                        return new BookViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.book_row_item, parent, false));
                    }

                    @Override
                    protected void onBindViewHolder(@NonNull BookViewHolder bookViewHolder, int position, @NonNull final BookLight book) {
                    }


                    @Override
                    protected void onError(@NonNull Exception e) {
                        super.onError(e);
                        mSwipeRefreshLayout.setRefreshing(false);
                    }
                };

                recyclerView.setAdapter(mAdapter);
}

数据库结构

在Firestore中添加新文档时发生IllegalArgumentException

0 个答案: