feat: optimize ignore fields in orm (#5015)

Author: kevwan

core/stores/sqlx/orm.go

@@ -9,7 +9,10 @@ import (
 	"github.com/zeromicro/go-zero/core/mapping"
 )
 
-const tagName = "db"
+const (
+	tagIgnore = "-"
+	tagName   = "db"
+)
 
 var (
 	// ErrNotMatchDestination is an error that indicates not matching destination to scan.
@@ -269,21 +272,20 @@ func unwrapFields(v reflect.Value) []reflect.Value {
 			continue
 		}
 
+		childType := indirect.Type().Field(i)
+		if parseTagName(childType) == tagIgnore {
+			continue
+		}
+
 		if child.Kind() == reflect.Ptr && child.IsNil() {
 			baseValueType := mapping.Deref(child.Type())
 			child.Set(reflect.New(baseValueType))
 		}
 
 		child = reflect.Indirect(child)
-		childType := indirect.Type().Field(i)
 		if child.Kind() == reflect.Struct && childType.Anonymous {
 			fields = append(fields, unwrapFields(child)...)
 		} else {
-			key := parseTagName(childType)
-			if key == "-" {
-				continue
-			}
-
 			fields = append(fields, child)
 		}
 	}