Adjusted token admin to map to user ID.

Closes #6131.

* Adds a proxy model for Token that uses the user.pk, rather than it's own.
* Adjusts Admin to map back from User ID to token instance.

Author: carltongibson

rest_framework/authtoken/admin.py

@@ -1,10 +1,56 @@
+from django.core.exceptions import ValidationError
 from django.contrib import admin
+from django.contrib.admin.utils import quote
+from django.contrib.admin.views.main import ChangeList
+from django.contrib.auth import get_user_model
+from django.urls import reverse
 
-from rest_framework.authtoken.models import Token
+from rest_framework.authtoken.models import TokenProxy, Token
+
+
+User = get_user_model()
+
+
+class TokenChangeList(ChangeList):
+    """Map to matching User id"""
+    def url_for_result(self, result):
+        pk = result.user.pk
+        return reverse('admin:%s_%s_change' % (self.opts.app_label,
+                                               self.opts.model_name),
+                       args=(quote(pk),),
+                       current_app=self.model_admin.admin_site.name)
 
 
-@admin.register(Token)
 class TokenAdmin(admin.ModelAdmin):
     list_display = ('key', 'user', 'created')
     fields = ('user',)
     ordering = ('-created',)
+    actions = None  # Actions not compatible with mapped IDs.
+
+    def get_changelist(self, request, **kwargs):
+        return TokenChangeList
+
+    def get_object(self, request, object_id, from_field=None):
+        """
+        Return an instance matching the field and value provided, the primary
+        key is used if no field is provided. Return ``None`` if no match is
+        found or the object_id fails validation.
+        """
+        queryset = self.get_queryset(request)
+        model = queryset.model
+        field = User._meta.pk
+        try:
+            object_id = field.to_python(object_id)
+            print(object_id)
+            user = User.objects.get(**{field.name: object_id})
+            return queryset.get(user=user)
+        except (model.DoesNotExist, User.DoesNotExist, ValidationError, ValueError):
+            return None
+
+    def delete_model(self, request, obj):
+        # Map back to Token, since delete() uses pk.
+        token = Token.objects.get(key=obj.key)
+        return super().delete_model(request, token)
+
+
+admin.site.register(TokenProxy, TokenAdmin)

rest_framework/authtoken/models.py

@@ -37,3 +37,16 @@ def generate_key(self):
 
     def __str__(self):
         return self.key
+
+
+class TokenProxy(Token):
+    """
+    Proxy mapping pk to user pk for use in admin.
+    """
+    @property
+    def pk(self):
+        return self.user.pk
+
+    class Meta:
+        proxy = True
+        verbose_name = "token"