Firestore 可编码不包括 Firestore DocumentID

Question

Im using Firebase Firestore in my project, and I have figured out that I need to use @DocumentId to properly decode firebase "_id" property into my codable struct.

My issue is that I need to save the encoded object (for now I'm using userdefaults) and re-decode the object later on in my apps lifecycle.

When I encode my Firestore object with Firestore.encode, it loses the id property as it becomes encoded to [String: Any] so when I try to decode the fetched pre-encoded object, I'm unable to do so.

For now I am storing the ID property separately, and re-adding it to the object once decoded.

Is this the correct way to handle Firestore codable? Or is there a cleaner way to encode and then decode Firestore encoded objects?

Answer 1

As discussed here

The solution is to explicitly ask for the DocumentID wrapping of DocumentReference and then manually unwrap yourself. It looks like this:

 ref = try container.decode(DocumentID<DocumentReference>.self, forKey: .ref).wrappedValue

Also check these similar cases for more information:

How can I get the document ID when using Codable in Firestore?

Getting DocumentID when decoding Firestore struct with custom decodable

Getting document ID when decoding firestore document using Swift Codable