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Add details to the spider middlewares docs

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Document the effects of the middleware order in a more detailed way.
This commit is contained in:
Jose Ricardo 2016-10-18 12:29:30 -02:00
parent ea7bd39529
commit e12e364a40
1 changed files with 6 additions and 1 deletions
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docs/topics/spider-middleware.rst
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@ -28,7 +28,12 @@ The :setting:`SPIDER_MIDDLEWARES` setting is merged with the
:setting:`SPIDER_MIDDLEWARES_BASE` setting defined in Scrapy (and not meant to
be overridden) and then sorted by order to get the final sorted list of enabled
middlewares: the first middleware is the one closer to the engine and the last
is the one closer to the spider.
is the one closer to the spider. In other words,
the :meth:`~scrapy.spidermiddlewares.SpiderMiddleware.process_spider_input`
method of each middleware will be invoked in increasing
middleware order (100, 200, 300, ...), and the
:meth:`~scrapy.spidermiddlewares.SpiderMiddleware.process_spider_output` method
of each middleware will be invoked in decreasing order.
To decide which order to assign to your middleware see the
:setting:`SPIDER_MIDDLEWARES_BASE` setting and pick a value according to where