revise logic a bit to ensure user and contact do not overwrite each other

src/djangooidc/backends.py

@@ -8,8 +8,6 @@ from django.contrib.auth import get_user_model
 from django.contrib.auth.backends import ModelBackend
 from django.utils import timezone
 
-from registrar.models.contact import Contact
-
 logger = logging.getLogger(__name__)
 
 
@@ -79,26 +77,15 @@ class OpenIdConnectBackend(ModelBackend):
             'last_name', and 'phone' fields, unless specific conditions are met.
 
             - 'phone' field will be updated if it's None or an empty string.
-            - 'first_name' and 'last_name' will be updated if the provided value is not empty.
+            - 'first_name', 'last_name' or 'phone' will be updated if the provided value is not empty.
         """
 
-        contacts = Contact.objects.filter(user=user)
-
-        if len(contacts) == 0:  # no matching contact
-            logger.warning("Could not find a contact when one should've existed.")
-
-        if len(contacts) > 1:  # multiple matches
-            logger.warning("There are multiple Contacts with the same email address.")
-
         # Iterate over fields to update
         for key, value in kwargs.items():
             # Check if the field is not 'first_name', 'last_name', or 'phone',
-            # or if it's the 'phone' field and 'user.phone' is None or empty,
+            # or if it's 'first_name' or 'last_name' or 'phone' and the provided value is not empty
-            # or if it's 'first_name' or 'last_name' and the provided value is not empty
+            if key not in ["first_name", "last_name", "phone"] or (
-            if (
+                key in ["first_name", "last_name", "phone"] and value
-                key not in ["first_name", "last_name", "phone"]
-                or (key == "phone" and not contacts[0].phone)
-                or (key in ["first_name", "last_name"] and value)
             ):
                 # Update the corresponding attribute of the user object
                 setattr(user, key, value)

src/djangooidc/tests/test_backends.py

@@ -64,6 +64,7 @@ class OpenIdConnectBackendTestCase(TestCase):
         # Remove given_name and family_name from the input, self.kwargs
         self.kwargs.pop("given_name", None)
         self.kwargs.pop("family_name", None)
+        self.kwargs.pop("phone", None)
 
         # Ensure that the authenticate method updates the existing user
         # and preserves existing first and last names
@@ -78,53 +79,13 @@ class OpenIdConnectBackendTestCase(TestCase):
         self.assertEqual(user.email, "john.doe@example.com")
         self.assertEqual(user.phone, "9999999999")
 
-    def test_authenticate_with_existing_user_with_no_phone_will_update_phone(self):
+    def test_authenticate_with_existing_user_different_name_phone(self):
-        """Test that authenticate updates an existing user if it finds one.
-        For this test, the existing user has an empty string for phone
-
-        The existing user's phone number is overwritten"""
-        # Create an existing user with the same username and with first and last names
-        existing_user = User.objects.create_user(username="test_user", phone="")
-
-        # Ensure that the authenticate method updates the existing user
-        # and preserves existing first and last names
-        user = self.backend.authenticate(request=None, **self.kwargs)
-        self.assertIsNotNone(user)
-        self.assertIsInstance(user, User)
-        self.assertEqual(user, existing_user)  # The same user instance should be returned
-
-        # Verify that user fields are correctly updated
-        self.assertEqual(user.first_name, "John")
-        self.assertEqual(user.last_name, "Doe")
-        self.assertEqual(user.email, "john.doe@example.com")
-        self.assertEqual(user.phone, "123456789")
-
-    def test_authenticate_with_existing_user_with_none_phone_will_update_phone(self):
-        """Test that authenticate updates an existing user if it finds one.
-        For this test, the existing user has None for phone
-
-        The existing user's phone number is overwritten"""
-        # Create an existing user with the same username and with first and last names
-        existing_user = User.objects.create_user(username="test_user")
-
-        # Ensure that the authenticate method updates the existing user
-        # and preserves existing first and last names
-        user = self.backend.authenticate(request=None, **self.kwargs)
-        self.assertIsNotNone(user)
-        self.assertIsInstance(user, User)
-        self.assertEqual(user, existing_user)  # The same user instance should be returned
-
-        # Verify that user fields are correctly updated
-        self.assertEqual(user.first_name, "John")
-        self.assertEqual(user.last_name, "Doe")
-        self.assertEqual(user.email, "john.doe@example.com")
-        self.assertEqual(user.phone, "123456789")
-
-    def test_authenticate_with_existing_user_different_name(self):
         """Test that authenticate updates an existing user if it finds one.
         For this test, given_name and family_name are supplied and overwrite"""
         # Create an existing user with the same username and with first and last names
-        existing_user = User.objects.create_user(username="test_user", first_name="WillBe", last_name="Replaced")
+        existing_user = User.objects.create_user(
+            username="test_user", first_name="WillBe", last_name="Replaced", phone="987654321"
+        )
 
         # Ensure that the authenticate method updates the existing user
         # and preserves existing first and last names

src/registrar/models/contact.py

@@ -101,12 +101,23 @@ class Contact(TimeStampedModel):
         # Call the parent class's save method to perform the actual save
         super().save(*args, **kwargs)
 
-        # Update the related User object's first_name and last_name
+        if self.user:
-        if self.user and (not self.user.first_name or not self.user.last_name or not self.user.phone):
+            updated = False
-            self.user.first_name = self.first_name
+
-            self.user.last_name = self.last_name
+            # Update first name and last name if necessary
-            self.user.phone = self.phone
+            if not self.user.first_name or not self.user.last_name:
-            self.user.save()
+                self.user.first_name = self.first_name
+                self.user.last_name = self.last_name
+                updated = True
+
+            # Update phone if necessary
+            if not self.user.phone:
+                self.user.phone = self.phone
+                updated = True
+
+            # Save user if any updates were made
+            if updated:
+                self.user.save()
 
     def __str__(self):
         if self.first_name or self.last_name: