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]
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