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Code Issues 32 Releases Wiki Activity

Avoided creating temporary lists for obtaining the first item.

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Sergey Fedoseev
2017-07-31 20:02:23 +05:00
committed by Tim Graham
parent 0f905e4b44
commit aadd3aeb2b
8 changed files with 17 additions and 19 deletions
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15
django/db/models/query.py
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@@ -275,7 +275,8 @@ class QuerySet:
qs = self._clone()
qs.query.set_limits(k, k + 1)
return list(qs)[0]
qs._fetch_all()
return qs._result_cache[0]
def __and__(self, other):
self._merge_sanity_check(other)
@@ -548,17 +549,13 @@ class QuerySet:
def first(self):
"""Return the first object of a query or None if no match is found."""
objects = list((self if self.ordered else self.order_by('pk'))[:1])
if objects:
return objects[0]
return None
for obj in (self if self.ordered else self.order_by('pk'))[:1]:
return obj
def last(self):
"""Return the last object of a query or None if no match is found."""
objects = list((self.reverse() if self.ordered else self.order_by('-pk'))[:1])
if objects:
return objects[0]
return None
for obj in (self.reverse() if self.ordered else self.order_by('-pk'))[:1]:
return obj
def in_bulk(self, id_list=None, *, field_name='pk'):
"""