By fcmax

2012-05-11 00:46:42 8 Comments

I can't change spider settings in parse method. But it is definitely must be a way.

For example:

class SomeSpider(BaseSpider):
    name = 'mySpider'
    allowed_domains = ['']
    start_urls = ['']
    settings.overrides['ITEM_PIPELINES'] = ['myproject.pipelines.FirstPipeline']
    print settings['ITEM_PIPELINES'][0]
    #printed 'myproject.pipelines.FirstPipeline'
    def parse(self, response):
        #...some code
        settings.overrides['ITEM_PIPELINES'] = ['myproject.pipelines.SecondPipeline']
        print settings['ITEM_PIPELINES'][0]
        # printed 'myproject.pipelines.SecondPipeline'
        item = Myitem()
        item['mame'] = 'Name for SecondPipeline'  

But! Item will be processed by FirstPipeline. New ITEM_PIPELINES param don't work. How can I change settings after start crawling? Thanks in advance!


@sergiuz 2015-09-26 21:23:39

If you want that different spiders to have different pipelines you can set for a spider a pipelines list attribute which defines the pipelines for that spider. Than in pipelines check for existence:

class MyPipeline(object):

    def process_item(self, item, spider):
        if self.__class__.__name__ not in getattr(spider, 'pipelines',[]):
            return item
        return item

class MySpider(CrawlSpider):
    pipelines = set([

If you want that different items to be proceesed by different pipelines you can do this:

    class MyPipeline2(object):
        def process_item(self, item, spider):
            if isinstance(item, MyItem):
                return item
            return item

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