#29769: Allow querying JSONField with F objects
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Reporter: Gabor Körber | Owner: Mani
Type: New feature | Status: assigned
Component: contrib.postgres | Version:
Severity: Normal | Resolution:
Keywords: F JSONField lookup | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Uxio0):
@GwynBleidD I see it as an issue that `F()` object is different from the
regular field issue:
`str(MyEvent.objects.values('arguments__to').query)`
`'SELECT ("myapp_myevent"."arguments" -> \'to\') FROM "myapp_myevent"'`
If I use `F()` object:
`str(MyEvent.objects.values(x=F('arguments__to')).query)`
`'SELECT "myapp_myevent"."arguments" AS "x" FROM "myapp_myevent"'`
This way I'm not able to do casting on that field, for example:
`str(MyEvent.objects.values(x=Cast(F('arguments__to'),
DecimalField())).query)`
`'SELECT ("myapp_myevent"."arguments")::numeric(None, None) AS "x" FROM
"myapp_myevent"'`
So for example I cannot find a way to translate this simple query:
`SELECT SUM((arguments -> 'to')::decimal) as my_sum FROM myapp_myevent;`
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Ticket URL: <https://code.djangoproject.com/ticket/29769#comment:8>
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