android - SaveAllInBackground无法在所需的deleteAllInBackground内部工作

SaveAllInBackground无法在所需的deleteAllInBackground内部工作。

我正在尝试使用全部保存在后台保存parseobjects的列表。为了避免表中出现重复，我在查询已经存在的行并将其删除(如果有的话)，然后保存新副本。因此，我在deleteAllInBackground的回调中调用saveAllInBackground。

问题是这样的:

例如:如果要删除的列表包含[a，b，c，d]，而要上传的列表只有[a，b，c，d，e，f]，则仅[e，f]可以解析。我正在将[a，b，c，d，e，f]传递到saveAllInBackground，但是只有[e，f]被保留。

我缺少什么吗？如何解决呢？

我可以使用其他方法吗？

是否有更好的方法来避免重复？我不想添加一个
beforeSave钩子(Hook)。调用saveAll的整个目的是减少API调用的次数。我想如果我使用beforeSave，无论如何我将不得不在云代码中运行一些查询。

这是我的代码

            ParseQuery query = new ParseQuery("PostChoice");

            query.fromPin();
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(final List<ParseObject> localList, ParseException e) {
                    if (localList != null && !localList.isEmpty()) {
                        List<ParseObject> postList = new ArrayList<ParseObject>();
                        for (ParseObject object : localList) {

                            postList.add(object.getParseObject("post"));
                        }
                        ParseQuery query = new ParseQuery("PostChoice");
                        query.whereContainedIn("post", postList);
                        query.whereEqualTo("user", ParseUser.getCurrentUser());
                        query.findInBackground(new FindCallback<ParseObject>() {
                            @Override
                            public void done(List<ParseObject> parseCloudList, ParseException e) {

                                if (parseCloudList != null && !parseCloudList.isEmpty()) {
                                    ParseObject.deleteAllInBackground(parseCloudList, new DeleteCallback() {
                                        @Override
                                        public void done(ParseException e) {
               // this gets executed and rows are accordingly deleted
                                            ParseObject.saveAllInBackground(localList, new SaveCallback() {
                                                @Override
                                                public void done(ParseException e) {
// this gets executed but the rows are not uploaded.
//the locallist is not empty. it contains the right data.
                                                    editor.putLong(Four.LAST_CHOICE_SYNC_TIME, System.currentTimeMillis());
                                                    editor.commit();
                                                    Log.i("SyncChoiceService", "Synced Choices");
                                                }
                                            });
                                        }
                                    });
                                }
                                else{
                                    ParseObject.saveAllInBackground(localList, new SaveCallback() {
                                        @Override
                                        public void done(ParseException e) {
                                            Log.i("SyncChoiceService", "Synced Choices");
                                            editor.putLong(Four.LAST_CHOICE_SYNC_TIME,System.currentTimeMillis());
                                            editor.commit();
                                        }
                                    });
                                }
                            }
                        });


                    }
                }
            });

最佳答案

我已经提出了这样的解决方案。符合我的要求我使用updatedValue并删除旧的，其余的作为一个整体进行更新。

ParseQuery query = new ParseQuery("PostChoice");

            query.fromPin();
            query.findInBackground(new FindCallback<ParseObject>() {
                @Override
                public void done(final List<ParseObject> localList, ParseException e) {
                    if (localList != null && !localList.isEmpty()) {

                        List<ParseObject> postList = new ArrayList<ParseObject>();
                        for (ParseObject object : localList) {

                            postList.add(object.getParseObject("post"));
                        }
                        ParseQuery query = new ParseQuery("PostChoice");
                        query.whereContainedIn("post", postList);
                        query.whereLessThan("updatedAt",System.currentTimeMillis());
                        query.whereEqualTo("user", ParseUser.getCurrentUser());
                        query.findInBackground(new FindCallback<ParseObject>() {
                            @Override
                            public void done(final List<ParseObject> parseCloudList, ParseException e) {
                                if (parseCloudList != null && !parseCloudList.isEmpty()) {
                                    ParseObject.deleteAllInBackground(parseCloudList, new DeleteCallback() {
                                        @Override
                                        public void done(ParseException e) {
                                            Log.i("SyncChoiceService", "Deleted old  Choices");

                                        }
                                    });
                                }


                                    }
                                });


ParseObject.saveAllInBackground(localList, new SaveCallback() {
        @Override
        public void done(ParseException e) {
            Log.i("SyncChoiceService", "Synced Choices");
        }
    });

                    }
                }
            });