fixed TypeError due to different attributes over directories and files

src/commoncode/resource.py

@@ -1591,10 +1591,13 @@ def _populate(self, scan_data):
         if not resources_data:
             raise Exception('Input has no file-level scan results.')
 
-        # We collect the first Resource so we can see what attributes it has and determine
-        # the root path from its path
-        sample_resource_data = resources_data[0]
-
+        # We iterate through all the Resource(s) so that we can build attributes each resource contains
+
+        sample_resource_data = dict()
+
+        for resource in resources_data:
+            sample_resource_data.update(resource)
+
         # Collect the existing attributes of the standard Resource class
         standard_res_attributes = set(f.name for f in attr.fields(Resource))
         # add these properties since they are fields but are serialized

tests/data/resource/virtual_codebase/fingerprint_attribute.json

@@ -0,0 +1,26 @@
+{
+    "files": [
+      {
+        "path": "apache_to_all_notable_lic_new",
+        "type": "directory",
+        "sha1": null,
+        "md5": null,
+        "scan_errors": []
+      },
+      {
+        "path": "apache_to_all_notable_lic_new/a1.py",
+        "type": "file",
+        "sha1": "535b9966048ad50a9d5eb2f167c0a3013ee5cc6f",
+        "md5": "e5658fe520bbebaf6f3d4be2e2525ab6",
+        "fingerprint": "e30cf09443e7878dfed3288886e97542",
+        "scan_errors": []
+      },
+      {
+        "path": "apache_to_all_notable_lic_new/a2.py",
+        "type": "file",
+        "sha1": "310797523e47db8481aeb06f1634317285115091",
+        "md5": "19efdad483f68bc9997a5c1f7ba41b26",
+        "scan_errors": []
+      }
+    ]
+  }

tests/test_resource.py

@@ -1055,6 +1055,15 @@ def test_virtual_codebase_can_process_minimal_resources_with_only_path(self):
             ])
         ]
         assert [r.to_dict() for r in codebase.walk()] == expected
+
+    def test_VirtualCodebase_account_fingerprint_attribute(self):
+        test_file = self.get_test_loc("resource/virtual_codebase/fingerprint_attribute.json")
+        codebase = VirtualCodebase(test_file)
+        resources_fingerprint = [resource.fingerprint for resource in codebase.walk()]
+        assert "e30cf09443e7878dfed3288886e97542" in resources_fingerprint
+        assert None in resources_fingerprint
+        assert codebase.get_resource(0) == codebase.root
+        assert resources_fingerprint.count(None) == 2
 
 
 class TestCodebaseLowestCommonParent(FileBasedTesting):