英文:
How to remove a Document Reference in list with WriteBatch?
问题
我正在使用Firebase Cloud数据库。这个问题与之前的问题类似，但现在我对DocumentReferences很感兴趣。我查询了一个集合并获得了一系列文档。每个文档都包含一个字段cars，其中包含DocumentReferences。每个DocumentReference引用一个表示汽车的文档。鉴于carsPath，它是指向汽车文档的路径，我想要从该列表中删除DocumentReferences。我正在使用WriteBatch。如果cars只包含路径，可以通过以下方式轻松实现：
batch.update(snapshot.getReference(), "cars", FieldValue.arrayRemove(carPath));
如果我们有DocumentReferences而不是Strings，是否有类似的方法呢？
英文:
I'm using Firebase Cloud database. This question is similar to the previous one but now I'm interested in DocumentReferences. I queried a collection and got a list of documents. Each document contains a field cars which contains DocumentReferences. Each DocumentReference references a document that represents a car. Given the carsPath which is a path to the car document, I want to remove the DocumentReferences in that list. I'm using WriteBatch. If cars would contain just the paths, it would be easy by using:
batch.update(snapshot.getReference(), "cars", FieldValue.arrayRemove(carPath));
Is there a way to do something similar if we have DocumentReferences instead of Strings?
答案1
得分: 1
只需将 DocumentReference 对象传递给 FieldValue.arrayRemove()，而不是传递字符串。引用的路径必须与数组中的内容完全匹配。
英文:
Just pass DocumentReference object instead of a string to FieldValue.arrayRemove(). The path of the reference must match exactly what's in the array.
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