英文:
Flutter app datastore not syncing with DynamoDB
问题
我的Flutter应用无法检索DynamoDB中新增的项目。
我在DynamoDB中有一个项目（id: abc012345）。我的Flutter应用允许我通过id显示项目。最初，我搜索了项目（id: abc012345）并在我的应用中显示出来。当我使用AppSync的Lambda函数从DynamoDB中删除它（ttl为0，所以它立即消失），该项目被删除并在我的应用中消失，这是预期的行为。然而，当我在DynamoDB中使用相同的id（abc012345）创建一个新项目并再次进行相同的过程时，我的应用无法找到该项目，而使用不同id添加项目则没有问题。我需要手动清除手机内部存储以使其重新同步。
我猜测重复使用id会导致缓存数据与后端实际数据之间的不一致。如果我确实需要重复使用id，我该怎么办？
英文:
My flutter app cannot retrieve the newly added item in the DynamoDB.
I have an item(id: abc012345) in the dynamodb. My flutter app allows me to display the item by their id. Initially, I searched the item(id: abc012345) and displayed on my app. When I removed it from the dynamodb with a lambda function using appsync (ttl is 0, so it's gone immediately), the item is removed and disappeared on my app, which is an expected behaviour. However, when I create a new item with the same id(abc012345) in the dynamodb and go through the same process again, my app cannot find the item while adding an item with a different id is fine. I need to manually clear the phone internal storage to make it sync again.
I guess reusing the id causes inconsistencies between the cached data and the actual data from the backend. What can I do if I really have to reuse the id?
答案1
得分: 0
我找到了一个解决方法。每当从Dynamodb中删除一个项目时，我会清除数据存储。
void observeDevice() {
final devicesStream = _deviceRepo.observeDevices();
devicesStream.listen((event) async {
if (event.eventType == EventType.delete) {
await Amplify.DataStore.clear();
await Future.delayed(const Duration(seconds: 2));
}
getDevices();
});
}
请注意，这是一个代码片段，用于观察设备并在删除事件发生时清除数据存储。
英文:
Found a workaround to this. I clear the datastore everytime an item is deleted from Dynamodb.
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-html -->
void observeDevice() {
final devicesStream = _deviceRepo.observeDevices();
devicesStream.listen((event) async {
if (event.eventType == EventType.delete) {
await Amplify.DataStore.clear();
await Future.delayed(const Duration(seconds: 2));
}
getDevices();
});
}
<!-- end snippet -->
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