init push

internal/transport/http/dto/null_int.go

@@ -0,0 +1,33 @@
+package dto
+
+import (
+	"bytes"
+	"encoding/json"
+)
+
+// NullInt allows PATCH semantics:
+// - field omitted  => Set=false (no change)
+// - value null     => Set=true, Valid=false (set DB NULL)
+// - value number   => Set=true, Valid=true, Value=<number>
+type NullInt struct {
+	Set   bool
+	Valid bool
+	Value int
+}
+
+func (n *NullInt) UnmarshalJSON(data []byte) error {
+	n.Set = true
+	trimmed := bytes.TrimSpace(data)
+	if bytes.Equal(trimmed, []byte("null")) {
+		n.Valid = false
+		n.Value = 0
+		return nil
+	}
+	var v int
+	if err := json.Unmarshal(trimmed, &v); err != nil {
+		return err
+	}
+	n.Valid = true
+	n.Value = v
+	return nil
+}