Fixed issue when passing errback parameter

Author: pedrosalgueiro

scrapyrt/core.py

@@ -145,6 +145,10 @@ def __init__(self, spider_name, request_kwargs, max_requests=None, start_request
         # callback will be added after instantiation of crawler object
         # because we need to know if spider has method available
         self.callback_name = request_kwargs.pop('callback', None) or 'parse'
+
+        # do the same for errback
+        self.errback_name = request_kwargs.pop('errback', None) or 'parse'
+        
         if request_kwargs.get("url"):
             self.request = self.create_spider_request(deepcopy(request_kwargs))
         else:
@@ -185,8 +189,8 @@ def spider_idle(self, spider):
         """Handler of spider_idle signal.
 
         Schedule request for url given to api, with optional callback
-        that can be passed as GET parameter.
-
+        and errback that can be passed as GET parameter.
+        
         spider_idle signal is used because we want to optionally enable
         start_requests for the spider and if request is scheduled in
         spider_opened signal handler it's fired earlier then start_requests
@@ -197,6 +201,11 @@ def spider_idle(self, spider):
             callback = getattr(self.crawler.spider, self.callback_name)
             assert callable(callback), 'Invalid callback'
             self.request = self.request.replace(callback=callback)
+
+            errback = getattr(self.crawler.spider, self.errback_name)
+            assert callable(errback), 'Invalid errback'
+            self.request = self.request.replace(errback=errback)
+           
             modify_request = getattr(
                 self.crawler.spider, "modify_realtime_request", None)
             if callable(modify_request):