fix access to core_version in get_flow_run_command()

changes/pr3177.yaml

@@ -0,0 +1,5 @@
+fix:
+  - "Fix access to `core_version` in Agent's `get_flow_run_command()` - [#3177](https://github.com/PrefectHQ/prefect/pull/3177)"
+
+contributor:
+  - "[James Lamb](https://github.com/jameslamb)"

src/prefect/utilities/agent.py

@@ -52,7 +52,7 @@ def get_flow_run_command(flow_run: GraphQLResult) -> str:
     Returns:
         - str: a prefect CLI command to execute a flow run
     """
-    core_version = flow_run.flow.core_version or "0.0.0"
+    core_version = getattr(flow_run.flow, "core_version", None) or "0.0.0"
 
     if LooseVersion(core_version) < LooseVersion("0.13.0"):
         return "prefect execute cloud-flow"

tests/utilities/test_agent.py

@@ -86,3 +86,21 @@ def test_get_flow_run_command(core_version, command):
     )
 
     assert get_flow_run_command(flow_run) == command
+
+
+def test_get_flow_run_command_works_if_core_version_not_on_response():
+    legacy_command = "prefect execute cloud-flow"
+    flow_run = GraphQLResult(
+        {
+            "flow": GraphQLResult(
+                {
+                    "storage": Local().serialize(),
+                    "environment": LocalEnvironment().serialize(),
+                    "id": "id",
+                }
+            ),
+            "id": "id",
+        }
+    )
+
+    assert get_flow_run_command(flow_run) == legacy_command