diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/ref/models/database-functions.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/ref/models/database-functions.txt b/docs/ref/models/database-functions.txt index cdd46ff1a2..717dc94cbf 100644 --- a/docs/ref/models/database-functions.txt +++ b/docs/ref/models/database-functions.txt @@ -55,6 +55,17 @@ Usage examples:: >>> print(aggregated['combined_age_default']) None +.. warning:: + + A python value passed to ``Coalesce`` on MySQL may be converted to an + incorrect type unless explicitly cast to the correct database type: + + >>> from django.db.models.expressions import RawSQL + >>> from django.utils import timezone + >>> now = timezone.now() + >>> now_sql = RawSQL("cast(%s as datetime)", (now,)) + >>> Coalesce('updated', now_sql) + Concat ------ |