Implement unassigning products to tasks

src/ifcopenshell-python/ifcopenshell/api/sequence/add_task.py

@@ -1,6 +1,7 @@
 import ifcopenshell.api
 import ifcopenshell
 
+
 class Usecase:
     def __init__(self, file, **settings):
         self.file = file
@@ -16,9 +17,9 @@ class Usecase:
             "root.create_entity",
             self.file,
             ifc_class="IfcTask",
-            name= None,
-            predefined_type= "NOTDEFINED",
-            identification= "none",
+            name=None,
+            predefined_type="NOTDEFINED",
+            identification="none",
         )
         task.IsMilestone = False
         if self.settings["work_schedule"]:
@@ -33,6 +34,6 @@ class Usecase:
             )
         elif self.settings["parent_task"]:
             ifcopenshell.api.run(
-                "nest.assign_object", self.file, object=task, relating_object=self.settings["parent_task"]
+                "nest.assign_object", self.file, related_object=task, relating_object=self.settings["parent_task"]
             )
         return task

src/ifcopenshell-python/ifcopenshell/api/sequence/data.py

@@ -79,12 +79,18 @@ class Data:
             data = task.get_info()
             del data["OwnerHistory"]
             data["RelatedObjects"] = []
+            data["RelatingProducts"] = []
             data["IsPredecessorTo"] = []
             data["IsSuccessorFrom"] = []
             if task.TaskTime:
                 data["TaskTime"] = data["TaskTime"].id()
             for rel in task.IsNestedBy:
                 [data["RelatedObjects"].append(o.id()) for o in rel.RelatedObjects if o.is_a("IfcTask")]
+            [
+                data["RelatingProducts"].append(r.RelatingProduct.id())
+                for r in task.HasAssignments
+                if r.is_a("IfcRelAssignsToProduct")
+            ]
             [data["IsPredecessorTo"].append(rel.RelatedProcess.id()) for rel in task.IsPredecessorTo or []]
             [data["IsSuccessorFrom"].append(rel.RelatingProcess.id()) for rel in task.IsSuccessorFrom or []]
             cls.tasks[task.id()] = data

src/ifcopenshell-python/ifcopenshell/api/sequence/unassign_product.py

@@ -0,0 +1,25 @@
+import ifcopenshell
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {
+            "relating_product": None,
+            "related_object": None,
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for rel in self.settings["related_object"].HasAssignments or []:
+            if not rel.is_a("IfcRelAssignsToProduct") or rel.RelatingProduct != self.settings["relating_product"]:
+                continue
+            if len(rel.RelatedObjects) == 1:
+                return self.file.remove(rel)
+            related_objects = list(rel.RelatedObjects)
+            related_objects.remove(self.settings["related_object"])
+            rel.RelatedObjects = related_objects
+            ifcopenshell.api.run("owner.update_owner_history", self.file, **{"element": rel})
+            return rel