Fix #7786: autodoc: can't detect overloaded methods defined in other file

CHANGES

@@ -42,6 +42,7 @@ Bugs fixed
 * #8157: autodoc: TypeError is raised when annotation has invalid __args__
 * #7964: autodoc: Tuple in default value is wrongly rendered
 * #8200: autodoc: type aliases break type formatting of autoattribute
+* #7786: autodoc: can't detect overloaded methods defined in other file
 * #8192: napoleon: description is disappeared when it contains inline literals
 * #8142: napoleon: Potential of regex denial of service in google style docs
 * #8169: LaTeX: pxjahyper loaded even when latex_engine is not platex

sphinx/ext/autodoc/__init__.py

@@ -1471,22 +1471,14 @@ def format_signature(self, **kwargs: Any) -> str:
             return ''
 
         sig = super().format_signature()
-
-        overloaded = False
-        qualname = None
-        # TODO: recreate analyzer for the module of class (To be clear, owner of the method)
-        if self._signature_class and self._signature_method_name and self.analyzer:
-            qualname = '.'.join([self._signature_class.__qualname__,
-                                 self._signature_method_name])
-            if qualname in self.analyzer.overloads:
-                overloaded = True
-
         sigs = []
-        if overloaded:
+
+        overloads = self.get_overloaded_signatures()
+        if overloads:
             # Use signatures for overloaded methods instead of the implementation method.
             method = safe_getattr(self._signature_class, self._signature_method_name, None)
             __globals__ = safe_getattr(method, '__globals__', {})
-            for overload in self.analyzer.overloads.get(qualname):
+            for overload in overloads:
                 overload = evaluate_signature(overload, __globals__,
                                               self.env.config.autodoc_type_aliases)
 
@@ -1500,6 +1492,20 @@ def format_signature(self, **kwargs: Any) -> str:
 
         return "\n".join(sigs)
 
+    def get_overloaded_signatures(self) -> List[Signature]:
+        if self._signature_class and self._signature_method_name:
+            for cls in self._signature_class.__mro__:
+                try:
+                    analyzer = ModuleAnalyzer.for_module(cls.__module__)
+                    analyzer.parse()
+                    qualname = '.'.join([cls.__qualname__, self._signature_method_name])
+                    if qualname in analyzer.overloads:
+                        return analyzer.overloads.get(qualname)
+                except PycodeError:
+                    pass
+
+        return []
+
     def add_directive_header(self, sig: str) -> None:
         sourcename = self.get_sourcename()
 

tests/roots/test-ext-autodoc/target/overload2.py

@@ -0,0 +1,5 @@
+from target.overload import Bar
+
+
+class Baz(Bar):
+    pass

tests/test_ext_autodoc.py

@@ -2002,6 +2002,22 @@ def test_overload(app):
     ]
 
 
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_overload2(app):
+    options = {"members": None}
+    actual = do_autodoc(app, 'module', 'target.overload2', options)
+    assert list(actual) == [
+        '',
+        '.. py:module:: target.overload2',
+        '',
+        '',
+        '.. py:class:: Baz(x: int, y: int)',
+        '              Baz(x: str, y: str)',
+        '   :module: target.overload2',
+        '',
+    ]
+
+
 @pytest.mark.sphinx('html', testroot='ext-autodoc')
 def test_pymodule_for_ModuleLevelDocumenter(app):
     app.env.ref_context['py:module'] = 'target.classes'