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 <[email protected]> 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 > [email protected] > > > On Sat, Jul 27, 2019 at 9:26 AM אורי <[email protected]> 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 >> [email protected] >> > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/CABD5YeHNUEozN0vg_M5Hz9QrCTUAzH--u9SHtPVeDvJ4ZgWeOA%40mail.gmail.com > <https://groups.google.com/d/msgid/django-users/CABD5YeHNUEozN0vg_M5Hz9QrCTUAzH--u9SHtPVeDvJ4ZgWeOA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAHn91odhu6Dtaxq%3DtVA5vmWSPmJUyRL42o--h--awBm3BHVjpw%40mail.gmail.com.
