From 0753968ef328282edfcb37dfbde073cd896a3d5e Mon Sep 17 00:00:00 2001
From: yataka <33962896+takaya0@users.noreply.github.com>
Date: Mon, 15 Jan 2024 23:37:19 +0900
Subject: [PATCH] add the "__prepare__" method to the list of recognized dunder
 method (#9529)

## Summary
Closes #9508 .
Add `__prepare__` method to dunder method list in
`is_known_dunder_method`.

## Test Plan
1. add "__prepare__" method to `Apple` class in
crates/ruff_linter/resources/test/fixtures/pylint/bad_dunder_method_name.py.
2. run `cargo test`
---
 .../resources/test/fixtures/pylint/bad_dunder_method_name.py  | 4 ++++
 crates/ruff_linter/src/rules/pylint/helpers.rs                | 1 +
 2 files changed, 5 insertions(+)

diff --git a/crates/ruff_linter/resources/test/fixtures/pylint/bad_dunder_method_name.py b/crates/ruff_linter/resources/test/fixtures/pylint/bad_dunder_method_name.py
index 5032f42ff1..f8aaddbf96 100644
--- a/crates/ruff_linter/resources/test/fixtures/pylint/bad_dunder_method_name.py
+++ b/crates/ruff_linter/resources/test/fixtures/pylint/bad_dunder_method_name.py
@@ -87,6 +87,10 @@ class Apples:
     def __special_custom_magic__(self):
         pass
 
+    @classmethod
+    def __prepare__():
+        pass
+
 
 def __foo_bar__():  # this is not checked by the [bad-dunder-name] rule
     ...
diff --git a/crates/ruff_linter/src/rules/pylint/helpers.rs b/crates/ruff_linter/src/rules/pylint/helpers.rs
index 75fb3a69fe..de867b3135 100644
--- a/crates/ruff_linter/src/rules/pylint/helpers.rs
+++ b/crates/ruff_linter/src/rules/pylint/helpers.rs
@@ -289,6 +289,7 @@ pub(super) fn is_known_dunder_method(method: &str) -> bool {
             | "__pos__"
             | "__post_init__"
             | "__pow__"
+            | "__prepare__"
             | "__radd__"
             | "__rand__"
             | "__rdivmod__"