Fix: calculate when next model ready to run correctly (#3612)

Author: treysp

sqlmesh/core/snapshot/definition.py

@@ -2099,7 +2099,7 @@ def get_next_model_interval_start(snapshots: t.Iterable[Snapshot]) -> datetime:
     now_dt = now()
     return min(
         [
-            snap.node.interval_unit.cron_next(now_dt)
+            snap.node.cron_next(now_dt)
             for snap in snapshots
             if snap.is_model and not snap.is_symbolic and not snap.is_seed
         ]

tests/core/test_snapshot.py

@@ -271,7 +271,11 @@ def test_add_interval_partial(snapshot: Snapshot, make_snapshot):
 def test_get_next_model_interval_start(make_snapshot):
     hourly_snapshot = make_snapshot(
         SqlModel(
-            name="late", kind=FullKind(), query=parse_one("SELECT 1, ds FROM name"), cron="@hourly"
+            name="late",
+            kind=FullKind(),
+            query=parse_one("SELECT 1, ds FROM name"),
+            cron="@hourly",
+            interval_unit=IntervalUnit.HALF_HOUR,
         )
     )