Remove error nesting (#646)

* Remove error nesting.

* Bump truss version.

Author: squidarth

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "truss"
-version = "0.7.1"
+version = "0.7.2rc7"
 description = "A seamless bridge from model development to model delivery"
 license = "MIT"
 readme = "README.md"

truss/templates/server/model_wrapper.py

@@ -366,7 +366,7 @@ def _handle_exception():
     # Note that logger.exception logs the stacktrace, such that the user can
     # debug this error from the logs.
     logging.exception("Internal Server Error")
-    raise HTTPException(status_code=500, detail={"message": "Internal Server Error"})
+    raise HTTPException(status_code=500, detail="Internal Server Error")
 
 
 def _intercept_exceptions_sync(func):

truss/tests/test_model_inference.py

@@ -424,7 +424,7 @@ def predict(self, request):
 
         assert_logs_contain_error(container.logs(), "ValueError: error")
 
-        assert "Internal Server Error" in response.json()["error"]["message"]
+        assert "Internal Server Error" in response.json()["error"]
 
     model_preprocess_error = """
     class Model:
@@ -452,7 +452,7 @@ def predict(self, request):
         assert "error" in response.json()
 
         assert_logs_contain_error(container.logs(), "ValueError: error")
-        assert "Internal Server Error" in response.json()["error"]["message"]
+        assert "Internal Server Error" in response.json()["error"]
 
     model_postprocess_error = """
     class Model:
@@ -479,7 +479,7 @@ def postprocess(self, response):
         assert response.status_code == 500
         assert "error" in response.json()
         assert_logs_contain_error(container.logs(), "ValueError: error")
-        assert "Internal Server Error" in response.json()["error"]["message"]
+        assert "Internal Server Error" in response.json()["error"]
 
     model_async = """
     class Model:
@@ -505,7 +505,7 @@ async def predict(self, request):
 
         assert_logs_contain_error(container.logs(), "ValueError: error")
 
-        assert "Internal Server Error" in response.json()["error"]["message"]
+        assert "Internal Server Error" in response.json()["error"]
 
 
 @pytest.mark.integration