Hi,
You can use the available built-in processors such as *Compose* or
*MapCompose*.
See this link :
https://doc.scrapy.org/en/latest/topics/loaders.html#scrapy.loader.processors.Compose.
On Monday, 27 February 2017 16:27:48 UTC+5:30, Hatch wrote:
>
> I currently use output_processor TakeFirst(), and write
> l.add_xpath('field', xpath), but when there are no matches I want my
> returned dict to have 'field': None, not to be missing the 'field' key
> altogether. How can I retain the 'field' key even if there is no xpath
> match?
>
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