You can now assign task successor and predecessors. Sweet. Thanks myoualid!

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

@@ -0,0 +1,27 @@
+import ifcopenshell
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {
+            "relating_process": None,
+            "related_process": None,
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for rel in self.settings["related_process"].IsSuccessorFrom or []:
+            if rel.RelatingProcess == self.settings["relating_process"]:
+                return rel
+        return self.file.create_entity(
+            "IfcRelSequence",
+            **{
+                "GlobalId": ifcopenshell.guid.new(),
+                "OwnerHistory": ifcopenshell.api.run("owner.create_owner_history", self.file),
+                "RelatingProcess": self.settings["relating_process"],
+                "RelatedProcess": self.settings["related_process"],
+            }
+        )

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

@@ -1,25 +0,0 @@
-import ifcopenshell
-import ifcopenshell.api
-
-
-class Usecase:
-    def __init__(self, file, **settings):
-        self.file = file
-        self.settings = {
-            "predecessor_task": None,
-            "sequence_type":"FINISH_START",
-            "task": None,            
-        }
-        for key, value in settings.items():
-            self.settings[key] = value
-
-    def execute(self):
-        #TODO: tasks can only have one relationship between oneanother: if a relationship is already assigned, it should overide the previous one's settings.
-        rel_sequence = self.file.create_entity("IfcRelSequence",**{
-                "GlobalId": ifcopenshell.guid.new(),
-                "OwnerHistory": ifcopenshell.api.run("owner.create_owner_history", self.file),
-                "RelatingProcess": self.settings["predecessor_task"],
-                "SequenceType": self.settings["sequence_type"],
-                "RelatedProcess": self.settings["task"],
-            })
-        return rel_sequence

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

@@ -1,25 +0,0 @@
-import ifcopenshell
-import ifcopenshell.api
-
-
-class Usecase:
-    def __init__(self, file, **settings):
-        self.file = file
-        self.settings = {
-            "task": None,
-            "sequence_type":"FINISH_START",
-            "successor_task": None,
-        }
-        for key, value in settings.items():
-            self.settings[key] = value
-
-    def execute(self):
-        #TODO: tasks can only have one relationship between oneanother: if a relationship is already assigned, it should overide the previous one's settings.
-        rel_sequence = self.file.create_entity("IfcRelSequence",**{
-                "GlobalId": ifcopenshell.guid.new(),
-                "OwnerHistory": ifcopenshell.api.run("owner.create_owner_history", self.file),
-                "RelatingProcess": self.settings["task"],
-                "SequenceType": self.settings["sequence_type"],
-                "RelatedProcess": self.settings["successor_task"],
-            })
-        return rel_sequence

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

@@ -76,6 +76,10 @@ class Data:
             data = task.get_info()
             del data["OwnerHistory"]
             data["RelatedObjects"] = []
+            data["IsPredecessorTo"] = []
+            data["IsSuccessorFrom"] = []
             for rel in task.IsNestedBy:
                 [data["RelatedObjects"].append(o.id()) for o in rel.RelatedObjects if o.is_a("IfcTask")]
+            [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_sequence.py

@@ -0,0 +1,18 @@
+import ifcopenshell
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {
+            "relating_process": None,
+            "related_process": None,
+        }
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for rel in self.settings["related_process"].IsSuccessorFrom or []:
+            if rel.RelatingProcess == self.settings["relating_process"]:
+                self.file.remove(rel)