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Report the specific, conflicting spider middlewares

This commit is contained in:
Adrián Chaves 2025-04-09 12:17:35 +02:00
parent 62d3c5a864
commit c3a903ec8f
1 changed files with 10 additions and 9 deletions
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19
scrapy/core/spidermw.py
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@ -77,15 +77,16 @@ class SpiderMiddlewareManager(MiddlewareManager):
]
if deprecated_middlewares and modern_middlewares:
raise ValueError(
"You are trying to combine spider middlewares that only "
"define the deprecated process_start_requests() method () "
"with spider middlewares that only define the "
"process_start() method (). This is not possible. You must "
"either disable or make universal 1 of those 2 sets of "
"spider middlewares. Making a spider middleware universal "
"means having it define both methods. See the release notes "
"of Scrapy VERSION for details: "
"https://docs.scrapy.org/en/VERSION/news.html"
f"You are trying to combine spider middlewares that only "
f"define the deprecated process_start_requests() method "
f"({deprecated_middlewares}) with spider middlewares that "
f"only define the process_start() method "
f"({modern_middlewares}). This is not possible. You must "
f"either disable or make universal 1 of those 2 sets of "
f"spider middlewares. Making a spider middleware universal "
f"means having it define both methods. See the release notes "
f"of Scrapy VERSION for details: "
f"https://docs.scrapy.org/en/VERSION/news.html"
)
self._use_start_requests = bool(deprecated_middlewares)