Update post_save to work with Contact

src/registrar/signals.py

@@ -5,7 +5,7 @@ from django.core.management import call_command
 from django.db.models.signals import post_save, post_migrate
 from django.dispatch import receiver
 
-from .models import User, UserProfile
+from .models import User, Contact
 
 
 logger = logging.getLogger(__name__)
@@ -15,18 +15,46 @@ logger = logging.getLogger(__name__)
 def handle_profile(sender, instance, **kwargs):
     """Method for when a User is saved.
 
-    If the user is being created, then create a matching UserProfile. Otherwise
-    save an updated profile or create one if it doesn't exist.
+    A first time registrant may have been invited, so we'll search for a matching
+    Contact record, by email address, and associate them, if possible.
+
+    A first time registrant may not have a matching Contact, so we'll create one,
+    copying the contact values we received from Login.gov in order to initialize it.
+
+    During subsequent login, a User record may be updated with new data from Login.gov,
+    but in no case will we update contact values on an existing Contact record.
     """
 
-    if kwargs.get("created", False):
-        UserProfile.objects.create(user=instance)
+    first_name = getattr(instance, "first_name", "")
+    last_name = getattr(instance, "last_name", "")
+    email = getattr(instance, "email", "")
+    phone = getattr(instance, "phone", "")
+
+    is_new_user = kwargs.get("created", False)
+
+    if is_new_user:
+        contacts = Contact.objects.filter(email=email)
     else:
-        # the user is not being created.
-        if hasattr(instance, "userprofile"):
-            instance.userprofile.save()
-        else:
-            UserProfile.objects.create(user=instance)
+        contacts = Contact.objects.filter(user=instance)
+
+    if len(contacts) == 0:  # no matching contact
+        Contact.objects.create(
+            user=instance,
+            first_name=first_name,
+            last_name=last_name,
+            email=email,
+            phone=phone,
+        )
+
+    if len(contacts) >= 1 and is_new_user:  # a matching contact
+        contacts[0].user = instance
+        contacts[0].save()
+
+        if len(contacts) > 1:  # multiple matches
+            logger.warning(
+                "There are multiple Contacts with the same email address."
+                f" Picking #{contacts[0].id} for User #{instance.id}."
+            )
 
 
 @receiver(post_migrate)