Opened 13 years ago

Closed 13 years ago

Last modified 9 years ago

#16286 closed New feature (invalid)

Models virtual fields and ModelForms

Reported by: loic84 Owned by: nobody
Component: Database layer (models, ORM) Version: 1.3
Severity: Normal Keywords:
Cc: ognajd@…, James Pic Triage Stage: Accepted
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Problem: ModelForms do not expose models virtual fields.

In case of models composite fields that are managed by a single virtual field it would be useful to be able to supply a form field in ModelForms.

Currently the only virtual field in Django is GenericForeignKey and it doesn't need this feature because each local field it relies on is responsible for its own data. However it would be a great addition for 3rd parties composite fields where the virtual field would need to supply a form field, process the submitted value and then populate local fields for final storage.

Change History (5)

comment:1 by Łukasz Rekucki, 13 years ago

Triage Stage: UnreviewedAccepted

Django doesn't have composite fields (yet!). There's a GSOC project (https://github.com/koniiiik/django) to do this, so when it's done it probably will have support for virtual fields on ModelForms.

comment:2 by Preston Holmes, 13 years ago

Resolution: invalid
Status: newclosed

There is no practical way to do this in a general purpose way in Django - no way for Django to know which widget to use. This is a case where the solution is to subclass ModelForm and add the form field and behavior you expect for your custom model implementation.

RE the other comment, I believe the OP was not talking about composite PK, but more the use of get/set methods exposed as a property on a model.

comment:3 by Daniel Sokolowski, 11 years ago

Cc: ognajd@… added

comment:4 by James Pic, 9 years ago

Currently the only virtual field in Django is GenericForeignKey and it doesn't need this feature because each local field it relies on is responsible for its own data.

How can the object_id field be validated without the knowledge of its GFK's content_type field ?

I'd like to re-open this: some apps have been providing working widgets for GFK for years now, so there's got to be a way.

comment:5 by James Pic, 9 years ago

Cc: James Pic added
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