#28857: PostgreSQL Cast function shortcut
-------------------------------------+-------------------------------------
Reporter: jzelez | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 1.11
layer (models, ORM) |
Severity: Normal | Keywords: postgres,orm
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
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In some cases when using the shortcut notation "::" the database gives an
error.
GOOD:
CAST("sensors_sensordata"."data" #>> '{Temperature}' AS DOUBLE
PRECISION) AS "temp"
ERROR:
"sensors_sensordata"."data" #>> '{Temperature}'::DOUBLE PRECISION AS
"temp"
I've got a response from Postgre people and they've said:
--------------
The precedence between the two is different. The equivalent would be:
("sensors_sensordata"."data" #>> '{Temperature}')::DOUBLE PRECISION
In other words, not a bug.
------------
So it seems the as_postgresql method needs to wrap the expression into
parenthesis.
https://docs.djangoproject.com/en/1.11/_modules/django/db/models/functions/base/#Cast
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Ticket URL: <https://code.djangoproject.com/ticket/28857>
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