Removed prints and tweaked docs.

Author: excessdenied

README.md

@@ -260,6 +260,6 @@ Python 3.6's typing will not preserve the Union and throws away the annotation f
 See [this issue](https://github.com/upsidetravel/graphene-pydantic/issues/11) for more details.
 The solution at present is to use Python 3.7.
 
-##### Unions don't work in Input Object Types
+##### Input Object Types don't support unions as fields
 
-GraphQL currently only supports unions for object types. See [this RFC](https://github.com/graphql/graphql-spec/blob/master/rfcs/InputUnion.md) for the progress on supporting input unions.
+This is a GraphQL limitation. See [this RFC](https://github.com/graphql/graphql-spec/blob/master/rfcs/InputUnion.md) for the progress on supporting input unions. If you see an error like '{union-type} may only contain Object types', you are most likely encountering this limitation.

graphene_pydantic/converters.py

@@ -94,7 +94,6 @@ def convert_pydantic_input_field(
     Convert a Pydantic model field into a Graphene type field that we can add
     to the generated Graphene data model type.
     """
-    print("convert_pydantic_input_field", type(field))
     declared_type = getattr(field, "type_", None)
     field_kwargs.setdefault(
         "type",
@@ -124,7 +123,6 @@ def convert_pydantic_field(
     Convert a Pydantic model field into a Graphene type field that we can add
     to the generated Graphene data model type.
     """
-    print("convert_pydantic_field", type(field))
     declared_type = getattr(field, "type_", None)
     field_kwargs.setdefault(
         "type",

tests/test_graphene.py

@@ -80,7 +80,6 @@ def test_query():
 
     assert result.errors is None
     assert result.data is not None
-    print(result)
     assert pydantic.parse_obj_as(List[FooBar], result.data["listFooBars"]) == foo_bars