Implement feature to select all products related to a task in blenderBIM, and the ifcopenshell.api

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

@@ -0,0 +1,28 @@
+import ifcopenshell
+
+
+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):
+        products = set()
+        related_object = None
+        if self.settings["related_object"]:
+            related_object = self.settings["related_object"]
+        elif self.settings["relating_product"]:
+            for reference in self.settings["relating_product"].ReferencedBy:
+                if reference.is_a("IfcRelAssignsToProduct"):
+                    related_object = referenced_by.RelatedObjects[0]
+        if related_object:
+            assignments = self.settings["related_object"].HasAssignments
+            for assignment in assignments:
+                if assignment.is_a("IfcRelAssignsToProduct"):
+                    products.add(assignment.RelatingProduct.id())
+        return products