How to Resolve Null Data Field Issue When Unmarshaling JSON to Protobuf Struct?

Unmarshaling JSON to Protobuf Struct Field: Resolving Data Field Null Issue

When attempting to unmarshal JSON data into a protobuf struct field of type google.protobuf.Value, you may encounter a situation where the Data field within the protobuf struct is set to nil. This issue arises due to the incompatibility between the standard library's encoding/json package and the specific requirements of protobuf Value fields.

To resolve this problem, a more suitable library should be used for unmarshaling. Google's protobuf library provides a more robust and tailored approach for handling protobuf-specific data types. Here's the corrected code using protojson.Unmarshal:

<code class="go">import (
    "google.golang.org/protobuf/encoding/protojson"
    "google.golang.org/protobuf/proto"
    "io"
)

req := &proto.JobCreateRequest{}
bytes, err := io.ReadAll(r.Body)
if err != nil {
    return err
}
err = protojson.Unmarshal(bytes, req)
if err != nil {
    return err
}</code>

By leveraging protojson.Unmarshal instead of the encoding/json package, you can effectively convert the JSON data into the protobuf struct, ensuring that the Data field is correctly populated. The resulting JobCreateRequest struct will contain the expected values for the name, description, and data fields.

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