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Fixed #32996 -- Cached PathInfos on relations.

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PathInfo values are ostensibly static over the lifetime of the object
for which they're requested, so the data can be memoized, quickly
amortising the cost over the process' duration.
This commit is contained in:
Keryn Knight 2021-08-05 19:11:14 +01:00 • committed by Mariusz Felisiak
parent 3ff7b15bb7
commit a697424969
11 changed files with 182 additions and 29 deletions
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7
django/db/models/sql/query.py
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@ -1528,8 +1528,11 @@ class Query(BaseExpression):
path.extend(path_to_parent)
cur_names_with_path[1].extend(path_to_parent)
opts = path_to_parent[-1].to_opts
if hasattr(field, 'get_path_info'):
pathinfos = field.get_path_info(filtered_relation)
if hasattr(field, 'path_infos'):
if filtered_relation:
pathinfos = field.get_path_info(filtered_relation)
else:
pathinfos = field.path_infos
if not allow_many:
for inner_pos, p in enumerate(pathinfos):
if p.m2m: