Fix #8534: autoattribute failed to document a commented attribute in alias dervied class

sphinx/ext/autodoc/__init__.py

@@ -2152,14 +2152,19 @@ class UninitializedInstanceAttributeMixin(DataDocumenterMixinBase):
 
     def get_attribute_comment(self, parent: Any) -> Optional[List[str]]:
         try:
-            analyzer = ModuleAnalyzer.for_module(self.modname)
-            analyzer.analyze()
+            for cls in inspect.getmro(parent):
+                try:
+                    module = safe_getattr(cls, '__module__')
+                    qualname = safe_getattr(cls, '__qualname__')
 
-            qualname = safe_getattr(parent, '__qualname__', None)
-            if qualname and self.objpath:
-                key = (qualname, self.objpath[-1])
-                if key in analyzer.attr_docs:
-                    return list(analyzer.attr_docs[key])
+                    analyzer = ModuleAnalyzer.for_module(module)
+                    analyzer.analyze()
+                    if qualname and self.objpath:
+                        key = (qualname, self.objpath[-1])
+                        if key in analyzer.attr_docs:
+                            return list(analyzer.attr_docs[key])
+                except (AttributeError, PycodeError):
+                    pass
         except (AttributeError, PycodeError):
             pass
 

tests/roots/test-ext-autodoc/target/typed_vars.py

@@ -31,4 +31,4 @@ class Derived(Class):
     attr7: int
 
 
-Alias = Class
+Alias = Derived

tests/test_ext_autodoc.py

@@ -1564,7 +1564,7 @@ def test_autodoc_typed_instance_variables(app):
         '.. py:attribute:: Alias',
         '   :module: target.typed_vars',
         '',
-        '   alias of :class:`target.typed_vars.Class`',
+        '   alias of :class:`target.typed_vars.Derived`',
         '',
         '.. py:class:: Class()',
         '   :module: target.typed_vars',
@@ -1683,16 +1683,22 @@ def test_autodoc_typed_inherited_instance_variables(app):
         '      :module: target.typed_vars',
         '      :type: int',
         '',
+        '      attr4',
+        '',
         '',
         '   .. py:attribute:: Derived.attr5',
         '      :module: target.typed_vars',
         '      :type: int',
         '',
+        '      attr5',
+        '',
         '',
         '   .. py:attribute:: Derived.attr6',
         '      :module: target.typed_vars',
         '      :type: int',
         '',
+        '      attr6',
+        '',
         '',
         '   .. py:attribute:: Derived.attr7',
         '      :module: target.typed_vars',