feat(yalogger): Implement MergeFields for logger

Author: YaCodesDevelopment

yalogger/logrus_logger.go

@@ -392,10 +392,10 @@ func (l *logrusAdapter) GetFields() map[string]any {
 //
 // Example usage:
 //
-//	val := logger.GetField("user_id")
-//	if val != nil {
-//	  // Handle missing field
-//	}
+//		val := logger.GetField("user_id")
+//		if val != nil {
+//	   // Handle missing field
+//		}
 func (l *logrusAdapter) GetField(key string) any {
 	val, ok := l.entry.Data[key]
 	if !ok {
@@ -405,6 +405,25 @@ func (l *logrusAdapter) GetField(key string) any {
 	return val
 }
 
+// MegreFields merges fields from another Logger instance into the current log context.
+//
+// If there are overlapping keys, the values from the other Logger will overwrite the current context.
+//
+// Parameters:
+//
+//   - other: the Logger instance whose fields will be merged into the current context.
+//
+// Example usage:
+//
+//	logger1 := logger.WithField("user_id", 42)
+//	logger2 := logger.WithField("session_id", "abc123")
+//	mergedLogger := logger1.MergeFields(logger2)
+func (l *logrusAdapter) MergeFields(other Logger) Logger {
+	return &logrusAdapter{
+		entry: l.entry.WithFields(other.GetFields()),
+	}
+}
+
 // DeleteField removes a field from the current log context.
 //
 // Parameters:

yalogger/yalogger.go

@@ -199,9 +199,20 @@ type Logger interface {
 	//
 	// Example usage:
 	//
-	//	 fields := logger.Fields()
+	//   fields := logger.Fields()
 	GetFields() map[string]any
 
+	// MergeFields merges fields from another Logger into the current log context.
+	//
+	// If a field already exists, it will be overwritten by the value from the other Logger.
+	//
+	// Example usage:
+	//
+	//   logger1 := logger.WithField("user_id", 42)
+	//   logger2 := logger.WithField("session_id", "abc123")
+	//   mergedLogger := logger1.MergeFields(logger2)
+	MergeFields(other Logger) Logger
+
 	// DeleteField removes a field from the current log context.
 	//
 	// Example usage:
@@ -215,7 +226,7 @@ type Logger interface {
 	//
 	//   userID, ok := logger.GetField("user_id").(uint64)
 	//   if !ok {
-	// 	    // Handle type assertion error
+	//       // Handle type assertion error
 	//   }
 	GetField(key string) any
 }