#26702: Document custom field subclass change requires new custom field class -------------------------------------+------------------------------------- Reporter: baylee | Owner: baylee Type: | Status: closed Cleanup/optimization | Component: Documentation | Version: 1.9 Severity: Normal | Resolution: fixed Keywords: | Triage Stage: Ready for | checkin Has patch: 1 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 -------------------------------------+------------------------------------- Changes (by heindshed):
* status: assigned => closed * resolution: => fixed Old description: > Related to #26586 > > Can't alter a custom field to have a different base field type. > Documentation should be updated to reflect this and proposed solution. > > Example before state: > {{{ > class CustomCharField(models.CharField): > def foo(self): > pass > > class Author(models.Model): > name = CustomCharField(max_length=255) > }}} > > Example of what won't work: > {{{ > class CustomCharField(models.TextField): > def foo(self): > pass > > class Author(models.Model): > name = CustomCharField(max_length=255) > }}} > > Example of what you should change to: > {{{ > class CustomFieldMixin(object): > def foo(self): > pass > > class CustomCharField(CustomFieldMixin, models.CharField): > pass > > class CustomTextField(CustomFieldMixin, models.TextField): > pass > > class Author(models.Model): > name = CustomTextField(max_length=255) > }}} > > Should also include link to: > https://docs.djangoproject.com/en/1.9/topics/migrations/#considerations- > when-removing-model-fields to explain why user must keep old field > definition around. 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