You can now clear all cost assignements at once

src/blenderbim/blenderbim/bim/module/cost/__init__.py

@@ -67,6 +67,7 @@ classes = (
     operator.ExpandCostItemRate,
     operator.ContractCostItemRate,
     operator.CalculateCostItemResourceValue,
+    operator.ClearCostItemAssignments,
     operator.LoadCostItemElementQuantities,
     operator.LoadCostItemTaskQuantities,
     operator.LoadCostItemResourceQuantities,

src/blenderbim/blenderbim/bim/module/cost/operator.py

@@ -635,3 +635,20 @@ class ExportCostSchedules(bpy.types.Operator):
     def draw(self, context):
         self.layout.label(text="Choose a format")
         self.layout.prop(self, "format")
+
+
+class ClearCostItemAssignments(bpy.types.Operator, tool.Ifc.Operator):
+    bl_idname = "bim.clear_cost_item_assignments"
+    bl_label = "Clear Cost Item Product Assignments"
+    bl_options = {"REGISTER", "UNDO"}
+    cost_item: bpy.props.IntProperty()
+    related_object_type: bpy.props.StringProperty()
+
+    def _execute(self, context):
+        core.clear_cost_item_assignments(
+            tool.Ifc,
+            tool.Cost,
+            cost_item=tool.Ifc.get().by_id(self.cost_item),
+            related_object_type=self.related_object_type,
+        )
+        return {"FINISHED"}

src/blenderbim/blenderbim/bim/module/cost/ui.py

@@ -374,6 +374,11 @@ class BIM_PT_cost_item_quantities(Panel):
             "active_cost_item_product_index",
         )
 
+        row2 = col.row()
+        op = row2.operator("bim.clear_cost_item_assignments", text="Clear assignments", icon="X")
+        op.cost_item = cost_item.ifc_definition_id
+        op.related_object_type = "IfcElement"
+
         if has_quantity_names:
             row2 = col.row()
             row2.prop(self.props, "product_quantity_names", text="")
@@ -414,6 +419,11 @@ class BIM_PT_cost_item_quantities(Panel):
             "active_cost_item_process_index",
         )
 
+        row2 = col.row()
+        op = row2.operator("bim.clear_cost_item_assignments", text="Clear assignments", icon="X")
+        op.cost_item = cost_item.ifc_definition_id
+        op.related_object_type = "IfcProcess"
+
         if has_quantity_names:
             row2 = col.row()
             row2.prop(self.props, "process_quantity_names", text="")
@@ -457,6 +467,11 @@ class BIM_PT_cost_item_quantities(Panel):
             "active_cost_item_resource_index",
         )
 
+        row2 = col.row()
+        op = row2.operator("bim.clear_cost_item_assignments", text="Clear assignments", icon="X")
+        op.cost_item = cost_item.ifc_definition_id
+        op.related_object_type = "IfcResource"
+
         if has_quantity_names:
             row2 = col.row()
             row2.prop(self.props, "resource_quantity_names", text="")

src/blenderbim/blenderbim/core/cost.py

@@ -107,8 +107,9 @@ def assign_cost_item_quantity(ifc, cost, cost_item, related_object_type, prop_na
     products = cost.get_products(related_object_type)
     if products:
         ifc.run("cost.assign_cost_item_quantity", cost_item=cost_item, products=products, prop_name=prop_name)
-        cost.load_cost_item_quantities(cost_item)
-
+        cost.load_cost_item_quantity_assignments(cost_item, related_object_type="PRODUCT")
+        cost.load_cost_item_quantity_assignments(cost_item, related_object_type="PROCESS")
+        cost.load_cost_item_quantity_assignments(cost_item, related_object_type="RESOURCE")
 
 def load_cost_item_quantities(cost):
     cost_item = cost.get_highlighted_cost_item()
@@ -136,7 +137,9 @@ def load_schedule_of_rates(cost, schedule_of_rates):
 
 def unassign_cost_item_quantity(ifc, cost, cost_item, products):
     ifc.run("cost.unassign_cost_item_quantity", cost_item=cost_item, products=products)
-    cost.load_cost_item_quantities(cost_item)
+    cost.load_cost_item_quantity_assignments(cost_item, related_object_type="PRODUCT")
+    cost.load_cost_item_quantity_assignments(cost_item, related_object_type="PROCESS")
+    cost.load_cost_item_quantity_assignments(cost_item, related_object_type="RESOURCE")
 
 def enable_editing_cost_item_quantities(cost, cost_item):
     cost.enable_editing_cost_item_quantities(cost_item)
@@ -161,7 +164,10 @@ def edit_cost_item_quantity(ifc, cost, physical_quantity):
     attributes = cost.get_cost_item_quantity_attributes()
     ifc.run("cost.edit_cost_item_quantity", physical_quantity=physical_quantity, attributes=attributes)
     cost.disable_editing_cost_item_quantity()
-    # cost.load_cost_item_quantities(cost.get_active_cost_item())
+    #TODO: REVIEW usefulness
+    cost.load_cost_item_quantity_assignments(cost.get_highlighted_cost_item(), related_object_type="PRODUCT")
+    cost.load_cost_item_quantity_assignments(cost.get_highlighted_cost_item(), related_object_type="PROCESS")
+    cost.load_cost_item_quantity_assignments(cost.get_highlighted_cost_item(), related_object_type="RESOURCE")
 
 def add_cost_value(ifc, cost, parent, cost_type, cost_category):
     value = ifc.run("cost.add_cost_value", parent=parent)
@@ -226,4 +232,11 @@ def calculate_cost_item_resource_value(ifc, cost_item):
     ifc.run("cost.calculate_cost_item_resource_value", cost_item=cost_item)
 
 def export_cost_schedules(cost, format):
-    cost.export_cost_schedules(format)
+    cost.export_cost_schedules(format)
+
+def clear_cost_item_assignments(ifc, cost, cost_item, related_object_type):
+    products = cost.get_cost_item_assignments(cost_item, filter_by_type=related_object_type)
+    if products:
+        ifc.run("cost.unassign_cost_item_quantity", cost_item=cost_item, products=products)
+    cost.load_cost_item_quantity_assignments(cost_item, related_object_type=related_object_type)
+    cost.load_cost_schedule_tree()