fix #1298

Author: seeM

nbdev/frontmatter.py

@@ -63,5 +63,10 @@ def cell(self, cell):
     def end(self):
         self.nb.frontmatter_ = self.fm
         if not self.fm: return
+        if not hasattr(self.nb, 'path_'):
+            raise AttributeError('Notebook missing `path_` attribute.\n\nPlease remove any nbdev-related notebook filters '
+                                 'from your _quarto.yml file (e.g. `ipynb-filter: [nbdev_filter]`), since they are no '
+                                 'longer supported as of nbdev v2.3. See the v2.3 launch post for more information: '
+                                 'https://forums.fast.ai/t/upcoming-changes-in-v2-3-edit-now-released/98905.')
         self.fm.update({'output-file': _nbpath2html(Path(self.nb.path_)).name})
         _insertfm(self.nb, self.fm)

nbs/api/09_frontmatter.ipynb

@@ -126,6 +126,11 @@
     "    def end(self):\n",
     "        self.nb.frontmatter_ = self.fm\n",
     "        if not self.fm: return\n",
+    "        if not hasattr(self.nb, 'path_'):\n",
+    "            raise AttributeError('Notebook missing `path_` attribute.\\n\\nPlease remove any nbdev-related notebook filters '\n",
+    "                                 'from your _quarto.yml file (e.g. `ipynb-filter: [nbdev_filter]`), since they are no '\n",
+    "                                 'longer supported as of nbdev v2.3. See the v2.3 launch post for more information: '\n",
+    "                                 'https://forums.fast.ai/t/upcoming-changes-in-v2-3-edit-now-released/98905.')\n",
     "        self.fm.update({'output-file': _nbpath2html(Path(self.nb.path_)).name})\n",
     "        _insertfm(self.nb, self.fm)"
    ]