diff --git a/sandbox/sandbox/apps/user/models.py b/sandbox/sandbox/apps/user/models.py
index 159740b..3051167 100644
--- a/sandbox/sandbox/apps/user/models.py
+++ b/sandbox/sandbox/apps/user/models.py
@@ -1,42 +1,115 @@
+from django.apps import apps
+from django.contrib import auth
+from django.contrib.auth.hashers import make_password
 from django.contrib.auth.models import (
-    AbstractBaseUser, PermissionsMixin, UserManager)
+    AbstractBaseUser,
+    BaseUserManager,
+    PermissionsMixin,
+)
 from django.core.mail import send_mail
 from django.db import models
 from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
 
 
+class UserManager(BaseUserManager):
+    use_in_migrations = True
+
+    def _create_user(self, email, password, **extra_fields):
+        """
+        Create and save a user with the given email and password.
+        """
+        email = self.normalize_email(email)
+        # Lookup the real model class from the global app registry so this
+        # manager method can be used in migrations. This is fine because
+        # managers are by definition working on the real model.
+        GlobalUserModel = apps.get_model(
+            self.model._meta.app_label, self.model._meta.object_name
+        )
+        user = self.model(email=email, **extra_fields)
+        user.password = make_password(password)
+        user.save(using=self._db)
+        return user
+
+    def create_user(self, email=None, password=None, **extra_fields):
+        extra_fields.setdefault("is_staff", False)
+        extra_fields.setdefault("is_superuser", False)
+        return self._create_user(email, password, **extra_fields)
+
+    def create_superuser(self, email=None, password=None, **extra_fields):
+        extra_fields.setdefault("is_staff", True)
+        extra_fields.setdefault("is_superuser", True)
+
+        if extra_fields.get("is_staff") is not True:
+            raise ValueError("Superuser must have is_staff=True.")
+        if extra_fields.get("is_superuser") is not True:
+            raise ValueError("Superuser must have is_superuser=True.")
+
+        return self._create_user(email, password, **extra_fields)
+
+    def with_perm(
+        self, perm, is_active=True, include_superusers=True, backend=None, obj=None
+    ):
+        if backend is None:
+            backends = auth._get_backends(return_tuples=True)
+            if len(backends) == 1:
+                backend, _ = backends[0]
+            else:
+                raise ValueError(
+                    "You have multiple authentication backends configured and "
+                    "therefore must provide the `backend` argument."
+                )
+        elif not isinstance(backend, str):
+            raise TypeError(
+                "backend must be a dotted import path string (got %r)." % backend
+            )
+        else:
+            backend = auth.load_backend(backend)
+        if hasattr(backend, "with_perm"):
+            return backend.with_perm(
+                perm,
+                is_active=is_active,
+                include_superusers=include_superusers,
+                obj=obj,
+            )
+        return self.none()
+
+
 class User(AbstractBaseUser, PermissionsMixin):
-    """Cusomtized version of the default `AbstractUser` from Django.
+    """Cusomtized version of the default `AbstractUser` from Django."""
 
-    """
-    first_name = models.CharField(_('first name'), max_length=100, blank=True)
-    last_name = models.CharField(_('last name'), max_length=100, blank=True)
-    email = models.EmailField(_('email address'), blank=True, unique=True)
+    first_name = models.CharField(_("first name"), max_length=100, blank=True)
+    last_name = models.CharField(_("last name"), max_length=100, blank=True)
+    email = models.EmailField(_("email address"), blank=True, unique=True)
     is_staff = models.BooleanField(
-        _('staff status'), default=False,
-        help_text=_('Designates whether the user can log into this admin '
-                    'site.'))
+        _("staff status"),
+        default=False,
+        help_text=_("Designates whether the user can log into this admin " "site."),
+    )
     is_active = models.BooleanField(
-        _('active'), default=True,
-        help_text=_('Designates whether this user should be treated as '
-                    'active. Unselect this instead of deleting accounts.'))
-    date_joined = models.DateTimeField(_('date joined'), default=timezone.now)
+        _("active"),
+        default=True,
+        help_text=_(
+            "Designates whether this user should be treated as "
+            "active. Unselect this instead of deleting accounts."
+        ),
+    )
+    date_joined = models.DateTimeField(_("date joined"), default=timezone.now)
 
     objects = UserManager()
 
-    USERNAME_FIELD = 'email'
+    USERNAME_FIELD = "email"
     REQUIRED_FIELDS = []
 
     class Meta:
-        verbose_name = _('user')
-        verbose_name_plural = _('users')
+        verbose_name = _("user")
+        verbose_name_plural = _("users")
 
     def get_full_name(self):
         """
         Returns the first_name plus the last_name, with a space in between.
         """
-        full_name = '%s %s' % (self.first_name, self.last_name)
+        full_name = "%s %s" % (self.first_name, self.last_name)
         return full_name.strip()
 
     def get_short_name(self):