chore: py3.7 compatibility

src/syrupy/report.py

@@ -4,7 +4,6 @@
     dataclass,
     field,
 )
-from functools import cached_property
 from gettext import (
     gettext,
     ngettext,
@@ -70,6 +69,9 @@ class SnapshotReport:
     used: "SnapshotFossils" = field(default_factory=SnapshotFossils)
     _provided_test_paths: Dict[str, List[str]] = field(default_factory=dict)
     _keyword_expressions: Set["Expression"] = field(default_factory=set)
+    _collected_items_by_nodeid: Dict[str, "pytest.Item"] = field(
+        default_factory=dict, init=False
+    )
 
     @property
     def update_snapshots(self) -> bool:
@@ -83,14 +85,11 @@ def warn_unused_snapshots(self) -> bool:
     def include_snapshot_details(self) -> bool:
         return bool(self.options.include_snapshot_details)
 
-    @cached_property
-    def _collected_items_by_nodeid(self) -> Dict[str, "pytest.Item"]:
-        return {
-            getattr(item, "nodeid"): item for item in self.collected_items  # noqa: B009
-        }
-
     def __post_init__(self) -> None:
         self.__parse_invocation_args()
+        self._collected_items_by_nodeid = {
+            getattr(item, "nodeid"): item for item in self.collected_items  # noqa: B009
+        }
 
         # We only need to discover snapshots once per test file, not once per assertion.
         locations_discovered: DefaultDict[str, Set[Any]] = defaultdict(set)