Replace alter field with adding a new field

api/users/migrations/0039_alter_ffadminuser_first_name.py

@@ -1,6 +1,13 @@
 # Generated by Django 4.2.16 on 2024-11-04 17:09
 
 from django.db import migrations, models
+from django.db.models import F
+
+
+def copy_first_names(apps, schema_editor):
+    FFAdminUser = apps.get_model("users", "FFAdminUser")
+
+    FFAdminUser.objects.update(first_name_v2=F("first_name"))
 
 
 class Migration(migrations.Migration):
@@ -10,9 +17,38 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.AlterField(
+        migrations.AddField(
             model_name="ffadminuser",
-            name="first_name",
-            field=models.CharField(max_length=150, verbose_name="first name"),
+            name="first_name_v2",
+            field=models.CharField(max_length=150, default=""),
         ),
+        migrations.RunPython(copy_first_names, reverse_code=migrations.RunPython.noop),
+        migrations.SeparateDatabaseAndState(
+            state_operations=[
+                migrations.RenameField(
+                    model_name="ffadminuser",
+                    old_name="first_name",
+                    new_name="_first_name_old",
+                ),
+                migrations.RenameField(
+                    model_name="ffadminuser",
+                    old_name="first_name_v2",
+                    new_name="first_name",
+                ),
+                migrations.AlterField(
+                    model_name="ffadminuser",
+                    name="_first_name_old",
+                    field=models.CharField(
+                        db_column="first_name", max_length=30, verbose_name="first name"
+                    ),
+                ),
+                migrations.AlterField(
+                    model_name="ffadminuser",
+                    name="first_name",
+                    field=models.CharField(
+                        db_column="first_name_v2", max_length=150, verbose_name="first name"
+                    ),
+                ),
+            ]
+        )
     ]

api/users/models.py

@@ -99,7 +99,9 @@ class FFAdminUser(LifecycleModel, AbstractUser):
     email = models.EmailField(unique=True, null=False)
     objects = UserManager()
     username = models.CharField(unique=True, max_length=150, null=True, blank=True)
-    first_name = models.CharField("first name", max_length=150)
+    first_name = models.CharField(
+        "first name", max_length=150, db_column="first_name_v2"
+    )
     last_name = models.CharField("last name", max_length=150)
     google_user_id = models.CharField(max_length=50, null=True, blank=True)
     github_user_id = models.CharField(max_length=50, null=True, blank=True)
@@ -111,6 +113,10 @@ class FFAdminUser(LifecycleModel, AbstractUser):
         choices=SignUpType.choices, max_length=100, blank=True, null=True
     )
 
+    _first_name_old = models.CharField(
+        "first name", max_length=30, db_column="first_name"
+    )
+
     uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
 
     USERNAME_FIELD = "email"