Support displaying Brick Bnode relations

- Important for Ifc External References and other data.
- Set predicate_uri of predicates of the Bnode to None, which is used to remove the ability to delete the relationship in the UI.
- Also added try/excepts to difficult edge cases such as the object_uri not having a "#" character in it (such as "<http://qudt.org/vocab/unit/>") and the object_uri not being a brick class, which breaks "view_brick_item".
- Removing a Bnode type from the entity's relation removes all relations of the Bnode also

src/blenderbim/blenderbim/bim/module/brick/data.py

@@ -75,37 +75,52 @@ class BrickschemaData:
                { ?predicate a brick:EntityProperty . }
                 ?object ?sp ?sv }
             }
+            GROUP BY ?object
         """.replace(
                 "{uri}", uri
             )
         )
         for row in query:
-            predicate = row.get("predicate")
-            predicate_name = predicate.toPython().split("#")[-1]
-            object = row.get("object")
-            object_name = object.toPython().split("#")[-1]
+            predicate_uri = row.get("predicate")
+            predicate_name = predicate_uri.toPython().split("#")[-1]
+            object_uri = row.get("object")
+            print("DEBUG: object is ", object_uri)
+            if isinstance(object_uri, BNode):
+                object_name = "[]"
+            else:
+                try:
+                    object_name = object_uri.toPython().split("#")[-1]
+                except:
+                    object_name = str(object_uri)
             results.append(
                 {
-                    "predicate": predicate,
+                    "predicate_uri": predicate_uri,
                     "predicate_name": predicate_name,
-                    "object": object,
+                    "object_uri": object_uri,
                     "object_name": object_name,
-                    "is_uri": isinstance(object, URIRef),
-                    "object_uri": object.toPython(),
-                    "is_globalid": predicate == "globalID",
+                    "is_uri": isinstance(object_uri, URIRef),
+                    "is_globalid": predicate_uri == "globalID",
                 }
             )
-            # if isinstance(row.get("object"), BNode):
-            #     for s, p, o in BrickStore.graph.triples((object, None, None)):
-            #         results.append(
-            #             {
-            #                 "predicate": predicate + ":" + p.toPython().split("#")[-1],
-            #                 "object": o.toPython().split("#")[-1],
-            #                 "is_uri": isinstance(o, URIRef),
-            #                 "object_uri": o.toPython(),
-            #                 "is_globalid": p.toPython().split("#")[-1] == "globalID",
-            #             }
-            #         )
+            if isinstance(object_uri, BNode):
+                for subject2, predicate2, object2 in BrickStore.graph.triples((object_uri, None, None)):
+                    predicate2_name = predicate2.toPython().split("#")[-1]
+                    try:
+                        object2_name = object2.toPython().split("#")[-1]
+                    except:
+                        object2_name = str(object2)
+                    print("DEBUG: ", predicate_name, ":", predicate2_name)
+                    results.append(
+                        {
+                            "predicate_uri": None,
+                            "predicate_name": predicate_name + ":" + predicate2_name,
+                            "object_uri": object2,
+                            "object_name": object2_name,
+                            "is_uri": isinstance(object2, URIRef),
+                            "is_globalid": predicate2_name == "globalID",
+                        }
+                    )
+                print("")
         return results
 
 

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

@@ -74,7 +74,10 @@ class ViewBrickItem(bpy.types.Operator, Operator):
     split_screen: bpy.props.BoolProperty(name="Split Screen", default=False, options={"HIDDEN"})
 
     def _execute(self, context):
-        core.view_brick_item(tool.Brick, item=self.item, split_screen=self.split_screen)
+        try:
+            core.view_brick_item(tool.Brick, item=self.item, split_screen=self.split_screen)
+        except:
+            self.report({'ERROR'}, f'Could not find {self.item}')
 
 
 class RewindBrickClass(bpy.types.Operator, Operator):

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

@@ -184,10 +184,10 @@ class BIM_PT_brickschema(Panel):
             row = self.layout.row(align=True)
             row.label(text=relation["predicate_name"])
             row.label(text=relation["object_name"])
-            if self.props.brick_edit_relations_toggled and relation["predicate_name"] != "type":
+            if self.props.brick_edit_relations_toggled and relation["predicate_uri"] and relation["predicate_name"] != "type":
                 op = row.operator("bim.remove_brick_relation", text="", icon="UNLINKED")
-                op.predicate = relation["predicate"]
-                op.object = relation["object"]
+                op.predicate = relation["predicate_uri"]
+                op.object = relation["object_uri"]
             if relation["is_uri"] and relation["object_name"] != self.props.active_brick_class:
                 op = row.operator("bim.view_brick_item", text="", icon="DISCLOSURE_TRI_RIGHT")
                 op.item = relation["object_uri"]

src/blenderbim/blenderbim/tool/brick.py

@@ -123,8 +123,11 @@ class Brick(blenderbim.core.tool.Brick):
     @classmethod
     def remove_relation(cls, brick_uri, predicate, object):
         with BrickStore.new_changeset() as cs:
-            for triple in BrickStore.graph.triples((brick_uri, predicate, object)):
-                cs.remove(triple)
+            for s, p, o in BrickStore.graph.triples((brick_uri, predicate, object)):
+                cs.remove((s, p, o))
+                if isinstance(o, BNode):
+                    for triple in BrickStore.graph.triples((object, None, None)):
+                        cs.remove(triple)
 
     @classmethod
     def clear_brick_browser(cls, split_screen=False):
@@ -340,8 +343,11 @@ class Brick(blenderbim.core.tool.Brick):
     @classmethod
     def remove_brick(cls, brick_uri):
         with BrickStore.new_changeset() as cs:
-            for triple in BrickStore.graph.triples((URIRef(brick_uri), None, None)):
-                cs.remove(triple)
+            for s, p, o in BrickStore.graph.triples((URIRef(brick_uri), None, None)):
+                cs.remove((s, p, o))
+                if isinstance(o, BNode):
+                    for triple in BrickStore.graph.triples((o, None, None)):
+                        cs.remove(triple)
 
     @classmethod
     def run_assign_brick_reference(cls, element=None, library=None, brick_uri=None):