英文:
How to use WriteBatch with Firebase storage?
问题
我正在使用Firebase云数据库和Firebase存储。我正在使用以下代码来使用WriteBatch删除两个文档：
WriteBatch batch = fireDB.batch();
batch.delete(docRef1);
batch.delete(docRef2);
batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
// 代码
}
});
我还想使用WriteBatch从存储中删除图像，这意味着如果其中一个操作失败，它们都会失败。我有一个名为imageURL的变量，其中包含Firebase存储中图像的URL。我尝试了以下代码：
batch.delete(storage.getStorage().getReferenceFromUrl(imageURL));
但它不起作用，因为：
'com.google.firebase.firestore.WriteBatch' 中的 'delete(com.google.firebase.firestore.DocumentReference)' 无法应用于 '(com.google.firebase.storage.StorageReference)'
是否可能实现这个目标？
英文:
I'm using Firebase cloud database and firebase storage. I'm using the following code in order to remove two documents using WriteBatch:
WriteBatch batch = fireDB.batch();
batch.delete(docRef1);
batch.delete(docRef2);
batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
// code
}
});
I want also to remove the image from the storage using WriteBatch, meaning, if one of them fails, they all fail to remove. I have a variable called imageURL which contains the URL of the image in the firebase storage. I tried:
batch.delete(storage.getStorage().getReferenceFromUrl(imageURL));
But it does not work because:
> 'delete(com.google.firebase.firestore.DocumentReference)' in 'com.google.firebase.firestore.WriteBatch' cannot be applied to '(com.google.firebase.storage.StorageReference)'
Is it possible to do?
答案1
得分: 2
没有办法在多个Firebase产品上运行单个操作。
最好的方法是：
- 按照对你的用例造成最少问题的顺序执行删除操作。通常情况下，这意味着最后删除图像，因为拥有一个孤立的图像对应用程序的影响较小，而拥有指向不存在图像的悬挂引用则会更加混乱。
- 为读取编写健壮的代码，能够处理孤立的图像和悬挂引用。
- 定期进行清理，通常在云函数中执行，清除孤立的文件和悬挂引用。
英文:
There is no way to run a single operation across multiple Firebase products.
The best you can do is:
- Perform the deletes in the order that leads to the least problems for your use-case. Typically this means deleting the images last, as having an orphaned image is less disruptive for an app than having a dangling reference to a non-existing image.
- Write robust code for the reading, that can deal with both orphaned images, and dangling references.
- Perform periodic cleanup, typically in a Cloud Function, getting rid of both orphaned files and dangling references.
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