Make _get_e2e_device_keys_and_signatures_txn return an attrs (#8224)

this makes it a bit clearer what's going on.

1 files changed, 4 insertions, 4 deletions

diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py

index 11956cc48e..8bedcdbdff 100644
--- a/synapse/storage/databases/main/devices.py
+++ b/synapse/storage/databases/main/devices.py
@@ -293,17 +293,17 @@ class DeviceWorkerStore(SQLBaseStore):
                 prev_id = stream_id
 
                 if device is not None:
-                    key_json = device.get("key_json", None)
+                    key_json = device.key_json
                     if key_json:
                         result["keys"] = db_to_json(key_json)
 
-                        if "signatures" in device:
-                            for sig_user_id, sigs in device["signatures"].items():
+                        if device.signatures:
+                            for sig_user_id, sigs in device.signatures.items():
                                 result["keys"].setdefault("signatures", {}).setdefault(
                                     sig_user_id, {}
                                 ).update(sigs)
 
-                    device_display_name = device.get("device_display_name", None)
+                    device_display_name = device.display_name
                     if device_display_name:
                         result["device_display_name"] = device_display_name
                 else: