Added ListError

pydantic · samuelcolvin · May 31, 2018 · May 26, 2018 · May 27, 2018 · May 27, 2018
commit 89804fba0dac97ed871e6ad4b7fccbeea19d687d
diff --git a/pydantic/errors.py b/pydantic/errors.py
@@ -17,6 +17,7 @@
     'EnumError',
     'IntegerError',
     'FloatError',
+    'ListError',
     'PathError',
 
     'NumberMinSizeError',
@@ -94,6 +95,11 @@ class FloatError(PydanticTypeError):
     msg_template = 'value is not a valid float'
 
 
+class ListError(PydanticTypeError):
+    code = 'list'
+    msg_template = 'value is not a valid list'
+
+
 class PathError(PydanticTypeError):
     code = 'path'
     msg_template = 'value is not a valid path'

diff --git a/pydantic/validators.py b/pydantic/validators.py
@@ -138,7 +138,13 @@ def dict_validator(v) -> dict:
 def list_validator(v) -> list:
     if isinstance(v, list):
         return v
-    return list(v)
+
+    try:
+        v = list(v)
+    except TypeError as e:
+        raise errors.ListError() from e
+
+    return v
 
 
 def tuple_validator(v) -> tuple:

diff --git a/tests/test_types.py b/tests/test_types.py
@@ -425,8 +425,8 @@ def test_list():
     assert exc_info.value.flatten_errors() == [
         {
             'loc': ('b',),
-            'msg': '\'int\' object is not iterable',
-            'type': 'type_error',
+            'msg': 'value is not a valid list',
+            'type': 'type_error.list',
         },
     ]