How to call fields from Revision model in a custom inherited model?

For example, if I need call date_created from Revision in my admin.py as list_display field? Is there possible?

@admin.register(Container)
class ContainerAdmin(CompareVersionAdmin, admin.ModelAdmin):
    list_display = ('date_created', 'id_auto_series', 'id_human', 'uuid', 'title', 'description', 'description_level',)
    filter_horizontal = ('items', 'container_child')

 ERRORS:
django_1    | <class 'collection.admin.ContainerAdmin'>: (admin.E108) The value of 'list_display[0]' refers to 'date_created', which is not a callable, an attribute of 'ContainerAdmin', or an attribute or method on 'collection.Container'.

[etianen]

Oh, and another correction:

def get_date_created(self): return Version.objects.get_for_ object(self).order_by(“id”).first().revision.date_created

It would be a lot easier to just add a “date_created” field to your model directly, however.

On 19 July 2018 at 16:06, Dave Hall [e-mail] wrote:

When you register a model with django-reversion, it doesn’t extend the model. So the Revision fields will not be available on your model.

Your get_date_created method has a type. The second “version” should be lowercase, as below:

def get_date_created(self): Version.objects.get_for_object(self) return version.revision.date_created

On 19 July 2018 at 15:55, Photonauta 35 [e-mail] wrote:

hi @etianen https://github.com/etianen, thanks for answer here. I’m not sure about the clarity of topic, so I’m sorry, let me ask again.

My question is: how can we call a property of Revision model after a extended model one (please, correct me if I has some misunderstanding).

1. I have a model called Post in my model.py file. This model has reversion register to be extended from Revision model, right?

@reversion.register() class Post(models.Model): “”“Used to store posts”“” title = models.CharField( max_length=256) content = models.TextField( null=True, blank=True)

def __str__(self):
    return self.title

class Meta:
    verbose_name = 'Post'
    verbose_name_plural = 'Posts'

1. So, in admin,py from the same model, I wanna call field in list_display to be listed, but field from Revision model seems dont be callables.

@admin.register(Post) class PostAdmin(CompareVersionAdmin, admin.ModelAdmin): list_display = (‘id’, ‘date_created’, ‘title’) search_fields = [‘all’]

Error message:

ERRORS: django_1 | <class ‘post.admin.PostAdmin’>: (admin.E108) The value of ‘list_display[1]’ refers to ‘date_created’, which is not a callable, an attribute of ‘PostAdmin’, or an attribute or method on ‘post.Post’.

So, despite of ‘date_created’ be a field from Revision and Revision be “extended” in Post, I dont just call ‘date_created’ in presets like list_display.

What I misunderstand here?

I tryed to create a function in my model, but again ‘date_created’ is not a valid field.

def get_date_created(self):
    return self.date_created

AttributeError: ‘Post’ object has no attribute ‘date_created’

This has no effect at all too:

def get_date_created(self):
    Version.objects.get_for_object(self)
    return Version.revision.date_created

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[intrepidocabral]

When you register a model with django-reversion, it doesn’t extend the model. So the Revision fields will not be available on your model.

ok! I got it now. Thank you.

def get_date_created(self): return Version.objects.get_for_object(self).order_by(“id”).first().revision.date_created

This works pretty well! Thank you again.