Improve exception error message (#301)

* Improve exception message

* Update changelog

* Code linter

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Extend type hints in `model_bakery.recipe` module, make `Recipe` class generic [PR #292](https://github.com/model-bakers/model_bakery/pull/292)
 - Explicitly add _fill_optional parameters to baker.make and baker.prepare to aid IDE autocomplete function. [PR #264](https://github.com/model-bakers/model_bakery/pull/264)
 - Fixed errors with reverse M2M relationships [PR #299](https://github.com/model-bakers/model_bakery/pull/299)
+- Improve exception message for unknown field types [PR #301](https://github.com/model-bakers/model_bakery/pull/301)
 
 ### Removed
 

model_bakery/baker.py

@@ -672,7 +672,9 @@ def generate_value(self, field: Field, commit: bool = True) -> Any:
         elif field.__class__ in self.type_mapping:
             generator = self.type_mapping[field.__class__]
         else:
-            raise TypeError("%s is not supported by baker." % field.__class__)
+            raise TypeError(
+                f"field {field.name} type {field.__class__} is not supported by baker."
+            )
 
         # attributes like max_length, decimal_places are taken into account when
         # generating the value.

tests/test_baker.py

@@ -578,6 +578,7 @@ def test_unsupported_model_raises_an_explanatory_exception(self):
             assert False, "Should have raised a TypeError"
         except TypeError as e:
             assert "not supported" in repr(e)
+            assert "field unsupported_field" in repr(e)
 
 
 @pytest.mark.django_db