Merge commit 'fec726d332a32994800159ac68ed7456abff9188' into HEAD

nexus_constructor/model/group.py

@@ -27,6 +27,10 @@
 CHILD_EXCLUDELIST = [TRANSFORMS_GROUP_NAME]
 
 
+def create_list_of_possible_streams():
+    return [module.value for module in StreamModules]
+
+
 @attr.s
 class Group:
     """
@@ -41,7 +45,7 @@ class Group:
     attributes = attr.ib(type=Attributes, factory=Attributes, init=False)
     values = None
     possible_stream_modules = attr.ib(
-        type=List[str], default=[module.value for module in StreamModules]
+        type=List[str], default=attr.Factory(create_list_of_possible_streams)
     )
     _group_placeholder: bool = False
 
@@ -181,13 +185,15 @@ def as_dict(self, error_collector: List[str]) -> Dict[str, Any]:
         return return_dict
 
     def set_possible_stream_modules(self, possible_stream_modules: List[str]):
-        self.possible_stream_modules = possible_stream_modules
+        self.possible_stream_modules = possible_stream_modules.copy()
 
     def get_possible_stream_modules(self) -> List[str]:
-        return self.possible_stream_modules
+        return self.possible_stream_modules.copy()
 
     def add_stream_module(self, module: str):
-        if module not in self.possible_stream_modules:
+        if module not in self.possible_stream_modules and module in [
+            module.value for module in StreamModules
+        ]:
             self._modify_possible_streams(module, self.possible_stream_modules.append)
 
     def remove_stream_module(self, module: str):

nexus_constructor/stream_fields_widget.py

@@ -675,7 +675,7 @@ def update_existing_stream_info(self, field):
         :param field: The stream group
         """
         if not field:
-            raise TypeError("Field is NoneType when " "expecting type StreamModule.")
+            raise TypeError("Field is NoneType when expecting type StreamModule.")
         if isinstance(field, Group):
             field = field.children[0]
         if hasattr(field, "parent_node") and isinstance(field.parent_node, Group):