问题

To convert a VendorDocumentReference to a DocumentReference<Map<String, dynamic>>, you can use the DocumentReference constructor. Here's how you can achieve this conversion:

// Assuming you have a VendorDocumentReference named vendorDocRef
DocumentReference<Map<String, dynamic>> convertedRef = DocumentReference<Map<String, dynamic>>(
  vendorDocRef.firestore,
  vendorDocRef.path,
);

// Now, convertedRef is a DocumentReference<Map<String, dynamic>> that you can use in your Invoice creation.

This code creates a new DocumentReference using the Firestore instance and path of your VendorDocumentReference, which effectively converts it into the desired type.

Invoices:
    invoice1 {
        Vendor: (reference) /Vendors/vendor1
    }

Vendors:
    vendor1 {
        Name: "John Doe"
}

@Collection<Invoice>('Invoices')
@firestoreSerializable
class Invoice {
  Invoice({
      required this.id,
      required this.vendor,
  });

    @Id()
    String id;
    @JsonKey(name: 'Vendor')
    DocumentReference<Map<String, dynamic>> vendor;
}

final invoicesRef = InvoiceCollectionReference();


@Collection<Vendor>('Vendors')
@firestoreSerializable
class Vendor {
    Vendor({
      required this.id,
      required this.name,
  });

    @Id()
    String id;
    @JsonKey(name: 'Name')
    String name;
}

final vendorsRef = VendorCollectionReference();

答案1

得分: 0

不要紧。我已经用转换器解决了：

    class VendorConverter extends JsonConverter<DocumentReference<Vendor>,
        DocumentReference<Map<String, dynamic>>> {
      @

<details>
<summary>英文:</summary>

Nevermind. I&#39;ve solved with converter:

    class VendorConverter extends JsonConverter&lt;DocumentReference&lt;Vendor&gt;,
        DocumentReference&lt;Map&lt;String, dynamic&gt;&gt;&gt; {
      @override
      DocumentReference&lt;Vendor&gt; fromJson(
          DocumentReference&lt;Map&lt;String, dynamic&gt;&gt; json) {
            return vendorsRef.doc(json.id).reference;
      }

      @override
      DocumentReference&lt;Map&lt;String, dynamic&gt;&gt; toJson(
          DocumentReference&lt;Vendor&gt; object) {
        final path = vendorsRef.doc(object.id).path;
        return FirebaseFirestore.instance.doc(path);
      }

      const VendorConverter();
    }

</details>