#2082 You can now filter by metadata existence in the selector syntax

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

@@ -321,8 +321,8 @@ class CopyRepresentation(bpy.types.Operator, Operator):
 
 class OverrideDeleteTrait:
     def delete_ifc_object(self, obj):
-        if obj.BIMObjectProperties.ifc_definition_id:
+        element = tool.Ifc.get_entity(obj)
-            element = IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id)
+        if element:
             IfcStore.delete_element(element)
             if getattr(element, "FillsVoids", None):
                 self.remove_filling(element)

src/ifcopenshell-python/ifcopenshell/util/selector.py

@@ -192,7 +192,9 @@ class Selector:
             element_value = cls.get_element_value(element, key)
             if element_value is None and value is not None:
                 continue
-            if not comparison or cls.filter_element(element, element_value, comparison, value):
+            if comparison and cls.filter_element(element, element_value, comparison, value):
+                results.append(element)
+            elif not comparison and element_value:
                 results.append(element)
         return results
 

src/ifcopenshell-python/test/util/test_selector.py

@@ -33,6 +33,13 @@ class TestSelector(test.bootstrap.IFC4):
         ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcSlab")
         assert subject.Selector.parse(self.file, f"#{element.GlobalId}") == [element]
 
+    def test_selecting_by_attribute_existence(self):
+        element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
+        element.Name = "Foobar"
+        ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcSlab")
+        assert subject.Selector.parse(self.file, '.IfcElement[Name]') == [element]
+        assert subject.Selector.parse(self.file, '.IfcElement[Description]') == []
+
     def test_selecting_by_attribute(self):
         element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
         element.Name = "Foobar"
@@ -40,6 +47,13 @@ class TestSelector(test.bootstrap.IFC4):
         assert subject.Selector.parse(self.file, '.IfcElement[Name="Foobar"]') == [element]
         assert subject.Selector.parse(self.file, '.IfcElement[Name="Foobaz"]') == []
 
+    def test_selecting_by_property_existence(self):
+        element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
+        pset = ifcopenshell.api.run("pset.add_pset", self.file, product=element, name="Foo_Bar")
+        ifcopenshell.api.run("pset.edit_pset", self.file, pset=pset, properties={"Foo": "Bar"})
+        assert subject.Selector.parse(self.file, '.IfcElement[Foo_Bar.Foo]') == [element]
+        assert subject.Selector.parse(self.file, '.IfcElement[Foo_Bar.Fox]') == []
+
     def test_selecting_by_string_property(self):
         element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")
         pset = ifcopenshell.api.run("pset.add_pset", self.file, product=element, name="Foo_Bar")