fix participant

apps/transaction/serializers.py

@@ -8,10 +8,15 @@ from apps.course.serializers import CourseDetailSerializer
 
 
 class ParticipantInfoSerializer(serializers.ModelSerializer):
+    phone_number = serializers.CharField(max_length=30)
+    
     class Meta:
         model = ParticipantInfo
         fields = ['fullname', 'email', 'phone_number', 'gender', 'birthdate']
 
+    def validate_phone_number(self, value):
+        return value
+
 
 class TransactionParticipantSerializer(serializers.ModelSerializer):
     participant_infos = ParticipantInfoSerializer(many=True)