Oxidaner opened a new issue, #3503: URL: https://github.com/apache/dubbo-go/issues/3503
### ✅ 验证清单 - [x] 🔍 我已经搜索过 [现有 Issues](https://github.com/apache/dubbo-go/issues)，确信这不是重复问题 ### 🚀 Go 版本 1.26.1 ### 📦 Dubbo-go 版本 v 3.3.0 ### 🖥️ 服务端配置 _No response_ ### 💻 客户端配置 _No response_ ### 🌐 协议配置 _No response_ ### 📋 注册中心配置 _No response_ ### 💾 操作系统 🍎 macOS ### 📝 Bug 描述 `MapGeneralizer.Generalize` uses the `m` struct tag as the generated map key, but `MapGeneralizer.Realize` does not use the same tag when decoding the map. `Realize` calls `mapstructure.Decode` with its default configuration. mapstructure defaults to the `mapstructure` tag and only performs case-insensitive field-name matching. As a result, an `m` tag that genuinely renames a field, such as `UserID -> user_id`, cannot be mapped back. The key is silently ignored, the target field remains its zero value, and no error is returned. This affects the default `generic=true` map generalization mode, including generic request arguments, generic responses, and `GenericService.InvokeWithType`. ### 🔄 重现步骤 Create `filter/generic/generalizer/m_tag_repro_test.go`: ```go package generalizer_test import ( "reflect" "testing" "dubbo.apache.org/dubbo-go/v3/filter/generic/generalizer" ) func TestMapGeneralizerMTagRoundTrip(t *testing.T) { type Payload struct { UserID string `m:"user_id"` Name string } in := Payload{ UserID: "42", Name: "alice", } g := generalizer.GetMapGeneralizer() generalized, err := g.Generalize(in) if err != nil { t.Fatal(err) } t.Logf("generalized: %#v", generalized) realized, err := g.Realize(generalized, reflect.TypeOf(in)) if err != nil { t.Fatal(err) } got := realized.(Payload) t.Logf("realized: %#v", got) if !reflect.DeepEqual(got, in) { t.Fatalf("round trip lost data: want %#v, got %#v", in, got) } } go test ./filter/generic/generalizer \ -run TestMapGeneralizerMTagRoundTrip \ -count=1 -v ### ✅ 预期行为 Payload{UserID: "42", Name: "alice"} ### ❌ 实际行为 generalized: map[string]interface {}{ "name": "alice", "user_id": "42", } realized: Payload{ UserID: "", Name: "alice", } round trip lost data ### 💡 可能的解决方案 _No response_ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
