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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/ref/models/querysets.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 8ce6d501ce..c348db182b 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -1956,6 +1956,17 @@ given parameters. Note that ``earliest()`` and ``latest()`` exist purely for convenience and readability. +.. admonition:: ``earliest()`` and ``latest()`` may return instances with null dates. + + Since ordering is delegated to the database, results on fields that allow + null values may be ordered differently if you use different databases. For + example, PostgreSQL and MySQL sort null values as if they are higher than + non-null values, while SQLite does the opposite. + + You may want to filter out null values:: + + Entry.objects.filter(pub_date__isnull=False).latest('pub_date') + ``earliest()`` ~~~~~~~~~~~~~~ |