#32418: Django f expressions seems to not work with MySQL
-----------------------------------------+------------------------
Reporter: HoshiYamazaki | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 3.1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-----------------------------------------+------------------------
My code:
```python
duration_expression = ExpressionWrapper(
datetime.timedelta(minutes=1) * F('duration'),
output_field=DurationField())
booking_end = ExpressionWrapper(
F('booking_dt') + duration_expression,
output_field=DateTimeField())
booking_qs.annotate(
booking_end=booking_end).get(
Q(Q(booking_dt__lte=first_interval),
Q(booking_dt__gte=next_interval)) |
Q(Q(booking_end__lte=first_interval),
Q(booking_end__gte=next_interval)))duration_expression =
ExpressionWrapper(
datetime.timedelta(minutes=1) * F('duration'),
output_field=DurationField())
booking_end = ExpressionWrapper(
F('booking_dt') + duration_expression,
output_field=DateTimeField())
booking_qs.annotate(
booking_end=booking_end).get(
Q(Q(booking_dt__lte=first_interval),
Q(booking_dt__gte=next_interval)) |
Q(Q(booking_end__lte=first_interval),
Q(booking_end__gte=next_interval)))
```
Error I get:
```
(1064, "You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near
'* `carwashes_carwashbooking`.`duration`) MICROSECOND) AS `booking_end`
FROM `car' at line 1")
```
SQL query:
```sql
('SELECT `carwashes_carwashbooking`.`id`, '
'`carwashes_carwashbooking`.`carwash_id`, '
'`carwashes_carwashbooking`.`created_dt`, '
'`carwashes_carwashbooking`.`booking_dt`, '
'`carwashes_carwashbooking`.`duration`,
`carwashes_carwashbooking`.`car_id`, '
'`carwashes_carwashbooking`.`car_name`,
`carwashes_carwashbooking`.`plate`, '
'`carwashes_carwashbooking`.`status`,
`carwashes_carwashbooking`.`driver_id`, '
'`carwashes_carwashbooking`.`phone_number`, '
'`carwashes_carwashbooking`.`service_id`,
`carwashes_carwashbooking`.`notes`, '
'(`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000 '
'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) AS '
'`booking_end` FROM `carwashes_carwashbooking` WHERE '
'(`carwashes_carwashbooking`.`carwash_id` = %s AND '
'`carwashes_carwashbooking`.`driver_id` = %s AND '
'((`carwashes_carwashbooking`.`booking_dt` <= %s AND '
'`carwashes_carwashbooking`.`booking_dt` >= %s) OR '
'((`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000
'
'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) <= %s
AND '
'(`carwashes_carwashbooking`.`booking_dt` + INTERVAL (INTERVAL 60000000 '
'MICROSECOND * `carwashes_carwashbooking`.`duration`) MICROSECOND) >=
%s))) '
'LIMIT 21')
```
Stackoverflow issue: https://stackoverflow.com/questions/66044255/django-
returns-sql-syntax-error-when-using-expressionwrapper-and-f-expressions
--
Ticket URL: <https://code.djangoproject.com/ticket/32418>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/056.75fca4d54c4b9921bfa0846b63c4ae2a%40djangoproject.com.
