Handle case where serializer does not have 'Meta' class (#7360)

src/backend/InvenTree/InvenTree/metadata.py

@@ -147,6 +147,7 @@ class InvenTreeMetadata(SimpleMetadata):
         serializer_info = super().get_serializer_info(serializer)
 
         # Look for any dynamic fields which were not available when the serializer was instantiated
+        if hasattr(serializer, 'Meta'):
             for field_name in serializer.Meta.fields:
                 if field_name in serializer_info:
                     # Already know about this one

src/backend/InvenTree/plugin/serializers.py

@@ -150,6 +150,11 @@ class PluginConfigEmptySerializer(serializers.Serializer):
 class PluginReloadSerializer(serializers.Serializer):
     """Serializer for remotely forcing plugin registry reload."""
 
+    class Meta:
+        """Meta for serializer."""
+
+        fields = ['full_reload', 'force_reload', 'collect_plugins']
+
     full_reload = serializers.BooleanField(
         required=False,
         default=False,
@@ -189,6 +194,11 @@ class PluginActivateSerializer(serializers.Serializer):
 
     model = PluginConfig
 
+    class Meta:
+        """Metaclass for serializer."""
+
+        fields = ['active']
+
     active = serializers.BooleanField(
         required=False,
         default=True,
@@ -213,6 +223,11 @@ class PluginActivateSerializer(serializers.Serializer):
 class PluginUninstallSerializer(serializers.Serializer):
     """Serializer for uninstalling a plugin."""
 
+    class Meta:
+        """Metaclass for serializer."""
+
+        fields = ['delete_config']
+
     delete_config = serializers.BooleanField(
         required=False,
         default=True,
@@ -253,6 +268,11 @@ class NotificationUserSettingSerializer(GenericReferencedSettingSerializer):
 class PluginRegistryErrorSerializer(serializers.Serializer):
     """Serializer for a plugin registry error."""
 
+    class Meta:
+        """Meta for serializer."""
+
+        fields = ['stage', 'name', 'message']
+
     stage = serializers.CharField()
     name = serializers.CharField()
     message = serializers.CharField()