#3275: [patch] select_related() additions (depth=N, fields=[])
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Reporter: David Cramer <[EMAIL PROTECTED]> | Owner: adrian
Status: new | Component:
Database wrapper
Version: SVN | Resolution:
Keywords: select_related() | Stage:
Accepted
Has_patch: 1 | Needs_docs: 1
Needs_tests: 1 | Needs_better_patch: 1
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Comment (by [EMAIL PROTECTED]):
There is a bug in the way depth is handled in fill_table_cache, see
test_depth_bug.diff for a test case. When you specify a non-zero depth
fill_table_cache goes one relationship too deep which causes
get_cached_row not to handle all the columns from select_related.
This bug shows up when you use extra on that QuerySet: the extra fields to
select should immediately follow columns handled by get_cached_row, but
instead they get data from the relationship that fill_table_cache added
and get_cached_row skipped.
See fix_depth_bug.diff for a solution.
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Ticket URL: <http://code.djangoproject.com/ticket/3275#comment:15>
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