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[Docs] CrawlSpider: add note about link text

This commit is contained in:
Eugenio Lacuesta 2019-04-01 12:31:26 -03:00
parent b5c552d17f
commit 07ff9248a5
1 changed files with 5 additions and 1 deletions
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6
docs/topics/spiders.rst
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@ -377,7 +377,10 @@ Crawling rules
.. class:: Rule(link_extractor, callback=None, cb_kwargs=None, follow=None, process_links=None, process_request=None)
``link_extractor`` is a :ref:`Link Extractor <topics-link-extractors>` object which
defines how links will be extracted from each crawled page.
defines how links will be extracted from each crawled page. Each produced link will
be used to generate a :class:`~scrapy.http.Request` object, which will contain the
link's text in its ``meta`` attribute.
The link text can be accessed from the callback method though ``response.meta['link_text']``
``callback`` is a callable or a string (in which case a method from the spider
object with that name will be used) to be called for each link extracted with
@ -438,6 +441,7 @@ Let's now take a look at an example CrawlSpider with rules::
item['id'] = response.xpath('//td[@id="item_id"]/text()').re(r'ID: (\d+)')
item['name'] = response.xpath('//td[@id="item_name"]/text()').get()
item['description'] = response.xpath('//td[@id="item_description"]/text()').get()
item['link_text'] = response.meta['link_text']
return item