#31582: Django template backend allocates model cache even iterator() is used
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Reporter: Sümer Cip | Owner: nobody
Type: Bug | Status: closed
Component: Template system | Version: 3.0
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Sümer Cip):
Hi Keryn,
I think you are exactly right about that:
I traced memory allocation before/after that function call:
{{{
if not hasattr(values, '__len__'):
print("render len enter", tracemalloc.get_traced_memory())
values = list(values)
print("render len exit", tracemalloc.get_traced_memory())
'''
render len enter (48421, 48653)
render len exit (9390626, 9462231)
'''
}}}
But we also have this afterwards in that function which complicates things
more:
{{{
for node in self.nodelist_loop:
nodelist.append(node.render_annotated(context))
}}}
{{{context}}} is pointing to the {{{item}}} which is the model itself!
Even we fix above {{{len()}}} call somehow, this will hurt us again.
I am not sure how to proceed further on this as this seems to require more
internal Django knowledge than I have right now :)
Any ideas?
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Ticket URL: <https://code.djangoproject.com/ticket/31582#comment:4>
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