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DOC remove Dynamic Creation of Item Classes section 

It was a hack, and dicts-as-items cover most use cases.

Dicts don't allow to attach metadata to fields,
but e.g. adding "_meta" key and removing it in a custom serializer
is no worse than creating classes dynamically.
This commit is contained in:
Mikhail Korobov 2015-03-23 18:11:35 +05:00
parent 8ac397670f
commit 5ac91e4883
1 changed files with 0 additions and 18 deletions
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docs/topics/practices.rst
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@ -183,21 +183,3 @@ If you are still unable to prevent your bot getting banned, consider contacting
.. _testspiders: https://github.com/scrapinghub/testspiders
.. _Twisted Reactor Overview: http://twistedmatrix.com/documents/current/core/howto/reactor-basics.html
.. _Crawlera: http://crawlera.com
.. _dynamic-item-classes:
Dynamic Creation of Item Classes
================================
For applications in which the structure of item class is to be determined by
user input or other changing conditions you can return regular Python
dicts from spiders.
Another option is to dynamically create Item classes::
from scrapy.item import DictItem, Field
def create_item_class(class_name, field_list):
fields = {field_name: Field() for field_name in field_list}
return type(class_name, (DictItem,), {'fields': fields})