Add iter_queryset method to utils.iterators module.

taiga/base/utils/iterators.py

@@ -16,6 +16,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from functools import wraps, partial
+from django.core.paginator import Paginator
+
 
 def as_tuple(function=None, *, remove_nulls=False):
     if function is None:
@@ -42,3 +44,15 @@ def split_by_n(seq:str, n:int):
     while seq:
         yield seq[:n]
         seq = seq[n:]
+
+
+def iter_queryset(queryset, itersize:int=20):
+    """
+    Util function for iterate in more efficient way
+    all queryset.
+    """
+    paginator = Paginator(queryset, itersize)
+    for page_num in paginator.page_range:
+        page = paginator.page(page_num)
+        for element in page.object_list:
+            yield element