Issue
In order to access settings from _init_
i had to add from_crawler @classmethod
. Now it appears that some functionality of scrapy framework was lost. i am getting AttributeError: 'Code1Spider' object has no attribute 'crawler'
when url fails and spider tries to retry request.
Scrapy version is 2.0.1. Spider is running on Zyte cloud.
What did i do wrong and how to fix it?
Here is my spider code:
class Code1Spider(scrapy.Spider):
name = 'cointelegraph_pr'
allowed_domains = ['cointelegraph.com']
start_urls = ['https://cointelegraph.com/press-releases']
def __init__(self, settings):
#Returns settings values as dict
settings=settings.copy_to_dict()
self.id = int(str(datetime.now().timestamp()).split('.')[0])
self.gs_id = settings.get('GS_ID')
self.endpoint_url = settings.get('ENDPOINT_URL')
self.zyte_api_key = settings.get('ZYTE_API_KEY')
self.zyte_project_id = settings.get('ZYTE_PROJECT_ID')
self.zyte_collection_name = self.name
#Loads a list of stop words from predefined google sheet
self.denied = load_gsheet(self.gs_id)
#Loads all scraped urls from previous runs from zyte collections
self.scraped_urls = load_from_collection(self.zyte_project_id, self.zyte_collection_name, self.zyte_api_key)
logging.info("###############################")
logging.info("Number of previously scraped URLs = {}.".format(len(self.scraped_urls)))
logging.info("")
# We need this to pass settings into init. Otherwise settings will be accessible only after init function.
# As per https://docs.scrapy.org/en/1.8/topics/settings.html#how-to-access-settings
@classmethod
def from_crawler(cls, crawler):
settings = crawler.settings
return cls(settings)
Here is the error:
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
result = g.send(result)
File "/usr/local/lib/python3.8/site-packages/scrapy/core/downloader/middleware.py", line 42, in process_request
defer.returnValue((yield download_func(request=request, spider=spider)))
File "/usr/local/lib/python3.8/site-packages/twisted/internet/defer.py", line 1362, in returnValue
raise _DefGen_Return(val)
twisted.internet.defer._DefGen_Return: <504 https://cointelegraph.com/press-releases/the-launch-of-santa-browser-to-bring-in-the-next-200m-users-onto-web30>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
result = g.send(result)
File "/usr/local/lib/python3.8/site-packages/scrapy/core/downloader/middleware.py", line 51, in process_response
response = yield deferred_from_coro(method(request=request, response=response, spider=spider))
File "/usr/local/lib/python3.8/site-packages/scrapy/downloadermiddlewares/retry.py", line 53, in process_response
return self._retry(request, reason, spider) or response
File "/usr/local/lib/python3.8/site-packages/scrapy/downloadermiddlewares/retry.py", line 69, in _retry
stats = spider.crawler.stats
AttributeError: 'Code1Spider' object has no attribute 'crawler'
Everything else is scrapy default spider. No modifications to settings or middleware. What did i do wrong and how to fix it?
Solution
That is because you are overwriting the from_crawler
method without assigning the crawler
to the spider.
change your from_crawler
method to the following:
@classmethod
def from_crawler(cls, crawler):
settings = crawler.settings
spider = cls(settings)
spider._set_crawler(crawler)
return spider
Answered By - Alexander
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