사용자 필드 관리

backend/internal/domain/json_map.go

@@ -0,0 +1,42 @@
+package domain
+
+import (
+	"database/sql/driver"
+	"encoding/json"
+	"errors"
+	"fmt"
+)
+
+// JSONMap is a custom type for handling map[string]any with PostgreSQL JSONB
+type JSONMap map[string]any
+
+// Value implements the driver.Valuer interface
+func (m JSONMap) Value() (driver.Value, error) {
+	if m == nil {
+		return nil, nil
+	}
+	ba, err := json.Marshal(m)
+	return string(ba), err
+}
+
+// Scan implements the sql.Scanner interface
+func (m *JSONMap) Scan(value any) error {
+	if value == nil {
+		*m = make(JSONMap)
+		return nil
+	}
+	var bytes []byte
+	switch v := value.(type) {
+	case []byte:
+		bytes = v
+	case string:
+		bytes = []byte(v)
+	default:
+		return errors.New(fmt.Sprintf("failed to scan JSONMap: %v", value))
+	}
+
+	result := make(JSONMap)
+	err := json.Unmarshal(bytes, &result)
+	*m = result
+	return err
+}