#14462: Aggregates default to the database type instead of the field type
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Reporter: WoLpH | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: 1.2
Keywords: aggregate, annotate, type, coerce | Stage: Unreviewed
Has_patch: 0 |
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First a little background information, I've got a couple of custom field
types which get cast right after loading the model.
So instead of a Decimal I get a Euro object with added features like
formatting and stuff like that.
However, it seems that the aggregate/annotate queries in Django do not
respect the `to_python()` method but simply cast to the type specified by
the database backend.
This can easily be fixed by modifying `convert_values()` so it returns
this:
{{{
#!python
return field.to_python(connection.ops.convert_values(value, field))
}}}
instead of
{{{
#!python
return connection.ops.convert_values(value, field)
}}}
The `convert_values()` function:
http://code.djangoproject.com/browser/django/trunk/django/db/models/sql/query.py#L298
Would this be the proper location to fix this? Either way, it has to be a
bug that the `max()` of a value returns a different type.
--
Ticket URL: <http://code.djangoproject.com/ticket/14462>
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