Added logic to allow for multiple slices

Author: Liam Costello

elasticsearch_dsl/search.py

@@ -326,7 +326,7 @@ def __getitem__(self, n):
                 raise ValueError("Search does not support negative slicing.")
             # Elasticsearch won't get all results so we default to size: 10 if
             # stop not given.
-            s._extra['from'] = n.start or 0
+            s._extra['from'] = (n.start or 0) + s._extra.get('from', 0)
             s._extra['size'] = n.stop - (n.start or 0) if n.stop is not None else 10
             return s
         else:  # This is an index lookup, equivalent to slicing by [n:n+1].

test_elasticsearch_dsl/test_search.py

@@ -246,6 +246,8 @@ def test_slice():
     assert {'query': {'match_all': {}}, 'from': 0, 'size': 5} == s[:5].to_dict()
     assert {'query': {'match_all': {}}, 'from': 3, 'size': 10} == s[3:].to_dict()
     assert {'query': {'match_all': {}}, 'from': 0, 'size': 0} == s[0:0].to_dict()
+    assert {'query': {'match_all': {}}, 'from': 10, 'size': 5} == s[10:][:5].to_dict()
+    assert {'query': {'match_all': {}}, 'from': 15, 'size': 10} == s[10:][:5][5:].to_dict()
 
 def test_index():
     s = search.Search()