register and sign in pages

backend/locations/seed.py

@@ -0,0 +1,37 @@
+"""Seed data for atolls and islands.
+
+Only the areas SAR Link actually serves are listed. Add more here (or in the
+admin) as coverage grows; `seed()` is idempotent, so re-running is safe.
+"""
+
+ATOLLS = [
+    {
+        "name": "Faafu",
+        "code": "F",
+        "islands": ["Dharanboodhoo"],
+    },
+]
+
+
+def seed(atoll_model, island_model) -> tuple[int, int]:
+    """Create any missing atolls/islands. Returns (atolls, islands) created.
+
+    Takes the models as arguments so both the management command and the data
+    migration can call it, the latter with historical models.
+    """
+    atolls_created = 0
+    islands_created = 0
+
+    for entry in ATOLLS:
+        atoll, created = atoll_model.objects.get_or_create(
+            name=entry["name"], defaults={"code": entry.get("code", "")}
+        )
+        atolls_created += int(created)
+
+        for island_name in entry["islands"]:
+            _, created = island_model.objects.get_or_create(
+                atoll=atoll, name=island_name
+            )
+            islands_created += int(created)
+
+    return atolls_created, islands_created