You can now assign summary tasks to a work schedule. Thanks myoualid!

src/ifcopenshell-python/ifcopenshell/api/control/assign_control.py

@@ -0,0 +1,52 @@
+import ifcopenshell
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {
+            "related_object": None,
+            "relating_control": None,
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        has_assignments = None
+        if self.settings["related_object"].HasAssignments:
+            for assignement in self.settings["related_object"].HasAssignments:
+                if assignement.is_a("IfclRelAssignsToControl"):
+                    has_assignments = assignement
+
+        controls = None
+        for rel in self.settings["relating_control"].Controls:
+            if rel.is_a("IfcRelAssignsToControl"):
+                controls = rel
+                break
+        if has_assignments and has_assignments == controls:
+            return
+        if has_assignments:
+            related_objects = list(has_assignments.RelatedObjects)
+            related_objects.remove(self.settings["related_object"])
+            if related_objects:
+                has_assignments.RelatedObjects = related_objects
+                ifcopenshell.api.run("owner.update_owner_history", self.file, **{"element": has_assignments})
+            else:
+                self.file.remove(has_assignments)
+        if controls:
+            related_objects = list(controls.RelatedObjects)
+            related_objects.append(self.settings["related_object"])
+            controls.RelatedObjects = related_objects
+            ifcopenshell.api.run("owner.update_owner_history", self.file, **{"element": controls})
+        else:
+            controls = self.file.create_entity(
+                "IfcRelAssignsToControl",
+                **{
+                    "GlobalId": ifcopenshell.guid.new(),
+                    "OwnerHistory": ifcopenshell.api.run("owner.create_owner_history", self.file),
+                    "RelatedObjects": [self.settings["related_object"]],
+                    "RelatingControl": self.settings["relating_control"],
+                }
+            )
+        return controls

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

@@ -4,7 +4,14 @@ import ifcopenshell.api
 class Usecase:
     def __init__(self, file, **settings):
         self.file = file
-        self.settings = {"name": None, "predefined_type": "NOTDEFINED", "is_milestone":False, "identification": "none", "predecessor_to":None, "successor_from":None}
+        self.settings = {
+            "name": None,
+            "predefined_type": "NOTDEFINED",
+            "is_milestone": False,
+            "identification": "none",
+            "predecessor_to": None,
+            "successor_from": None,
+        }
         for key, value in settings.items():
             self.settings[key] = value
 
@@ -17,4 +24,4 @@ class Usecase:
             name=self.settings["name"],
         )
         task.IsMilestone = self.settings["is_milestone"]
-        return task
+        return task

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

@@ -52,6 +52,11 @@ class Data:
             data["StartTime"] = ifcopenshell.util.date.ifc2datetime(data["StartTime"])
             if data["FinishTime"]:
                 data["FinishTime"] = ifcopenshell.util.date.ifc2datetime(data["FinishTime"])
+            data["RelatedObjects"] = []
+            for rel in work_schedule.Controls:
+                for obj in rel.RelatedObjects:
+                    if obj.is_a("IfcTask"):
+                        data["RelatedObjects"].append(obj.id())
             cls.work_schedules[work_schedule.id()] = data
 
     @classmethod