You can do that with proxy models which allows you to override and add
methods.
Of course if there is a need to really modify original model it gets tricky.
la 27. heinäk. 2019 klo 10.49 אורי <u...@speedy.net> kirjoitti:
> Hi,
>
> I had to change the following lines because tests failed:
>
> class Friend1(object):
> def __str__(self):
> return "User {} is friends with {}".format(self.to_user,
> self.from_user)
>
>
> class FriendshipRequest1(object):
> def __str__(self):
> return "Friendship request from user {} to {}".format(self.from_user,
> self.to_user)
>
>
> Friend.__str__ = Friend1.__str__
> FriendshipRequest.__str__ = FriendshipRequest1.__str__
>
>
> אורי
> u...@speedy.net
>
>
> On Sat, Jul 27, 2019 at 9:26 AM אורי <u...@speedy.net> wrote:
>
>> Django users,
>>
>> I want to override def __str__ of models I'm using, but the models are
>> maintained by other developers. I think the __str__ is only used by the
>> admin interface. I found out that I can do something like this:
>>
>> from django.contrib import admin
>> from django.contrib.sites.models import Site
>> from django.contrib.auth.models import Group
>>
>> from friendship.models import Follow, Friend, FriendshipRequest, Block
>>
>>
>> class ReadOnlyModelAdmin(admin.ModelAdmin):
>> """
>> ModelAdmin class that prevents modifications through the admin.
>>
>> The changelist and the detail view work, but a 403 is returned
>> if one actually tries to edit an object.
>> """
>> actions = None
>>
>> # We cannot call super().get_fields(request, obj) because that method
>> calls
>> # get_readonly_fields(request, obj), causing infinite recursion. Ditto
>> for
>> # super().get_form(request, obj). So we assume the default ModelForm.
>> def get_readonly_fields(self, request, obj=None):
>> return self.fields or [f.name for f in self.model._meta.fields]
>>
>> def has_add_permission(self, request):
>> return False
>>
>> # Allow viewing objects but not actually changing them.
>> def has_change_permission(self, request, obj=None):
>> return (request.method in ['GET', 'HEAD'] and
>> super().has_change_permission(request, obj))
>>
>> def has_delete_permission(self, request, obj=None):
>> return False
>>
>>
>> admin.site.unregister(Site)
>> admin.site.register(Site, ReadOnlyModelAdmin)
>>
>> admin.site.unregister(Group)
>> # admin.site.register(Group, ReadOnlyModelAdmin)
>>
>> admin.site.unregister(Block)
>> admin.site.unregister(Follow)
>> admin.site.unregister(Friend)
>> admin.site.unregister(FriendshipRequest)
>> # admin.site.register(Block, ReadOnlyModelAdmin)
>> # admin.site.register(Follow, ReadOnlyModelAdmin)
>> admin.site.register(Friend, ReadOnlyModelAdmin)
>> admin.site.register(FriendshipRequest, ReadOnlyModelAdmin)
>>
>>
>> class Friend1(Friend):
>> def __str__(self):
>> return "User {} is friends with {}".format(self.to_user,
>> self.from_user)
>>
>>
>> class FriendshipRequest1(FriendshipRequest):
>> def __str__(self):
>> return "Friendship request from user {} to
>> {}".format(self.from_user, self.to_user)
>>
>>
>> Friend.__str__ = Friend1.__str__
>> FriendshipRequest.__str__ = FriendshipRequest1.__str__
>>
>> But, is it possible override __str__ in a cleaner way? It seems to me not
>> such a clean way to override a method (but it works). But I have to use the
>> model itself, because there is a lot of code in the package I'm using that
>> uses the model itself.
>>
>> (We are using our own Block model which I think we developed before they
>> developed a similar model. We are not using their Follow model too).
>>
>> אורי
>> u...@speedy.net
>>
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