From 82cf911192c5c36bea5d545b3bf0200cebdfa88a Mon Sep 17 00:00:00 2001
From: elpolilla <none@none>
Date: Mon, 24 Nov 2008 12:05:23 +0000
Subject: [PATCH] Added method for inserting adaptors into a pipeline

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%40405
---
 scrapy/trunk/scrapy/item/models.py | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/scrapy/trunk/scrapy/item/models.py b/scrapy/trunk/scrapy/item/models.py
index 004844f26..b36542941 100644
--- a/scrapy/trunk/scrapy/item/models.py
+++ b/scrapy/trunk/scrapy/item/models.py
@@ -18,11 +18,22 @@ class ScrapedItem(object):
         return self
     
     def set_attrib_adaptors(self, attrib, pipe):
-        """
-        Set the adaptors (from a list or tuple) to be used for a specific attribute.
-        """
+        """ Set the adaptors (from a list or tuple) to be used for a specific attribute. """
         self._adaptors_dict[attrib] = AdaptorPipe(pipe) if hasattr(pipe, '__iter__') else None
 
+    def add_adaptor(self, attrib, adaptor, position=None):
+        """
+        Add an adaptor for the specified attribute at the given position.
+        If position = None, then the adaptor is appended at the end of the pipeline.
+        """
+        if callable(adaptor):
+            pipe = self._adaptors_dict.get(attrib, [])
+            if position is None:
+                pipe = pipe + [adaptor]
+            else:
+                pipe.insert(position, adaptor)
+            self.set_attrib_adaptors(attrib, pipe)
+
     def attribute(self, attrname, value, **kwargs):
         pipe = self._adaptors_dict.get(attrname)
         if pipe: