Init

.gitignore

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+
+.venv/
+**/__pycache__
+

field_directive.py

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+
+
+from fastapi import FastAPI
+import strawberry
+from strawberry.schema_directive import Location
+from strawberry.fastapi import GraphQLRouter
+
+@strawberry.schema_directive(locations=[Location.FIELD_DEFINITION])
+class TestDirective: pass
+
+@strawberry.type
+class Query:
+    @strawberry.field(directives=[TestDirective()])
+    def test() -> str:
+        return "Test"
+
+schema = strawberry.Schema(Query)
+
+router = GraphQLRouter(schema, prefix='/graphql', graphql_ide="apollo-sandbox")
+app = FastAPI()
+app.include_router(router)
+

main.py

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+
+import traceback
+from typing import Callable
+from strawberry.cli.utils import load_schema
+from strawberry.printer import print_schema
+
+DIRECTIVE_NAMES_QUERY = 'query { __schema { directives { name } } }'
+
+def test_field_directive_schema_export():
+    schema_symbol = load_schema("field_directive:schema", ".")
+    output = print_schema(schema_symbol)
+    assert "testDirective" in output
+
+def test_one_of_schema_export():
+    schema_symbol = load_schema("one_of_directive:schema", ".")
+    output = print_schema(schema_symbol)
+    assert "oneOf" in output
+
+def test_field_directive_introspection():
+    from field_directive import schema
+    result = schema.execute_sync(DIRECTIVE_NAMES_QUERY)
+    directives = { directive['name'] for directive in result.data['__schema']['directives'] }
+    assert "testDirective" in directives
+
+def test_one_of_introspection():
+    from one_of_directive import schema
+    result = schema.execute_sync(DIRECTIVE_NAMES_QUERY)
+    directives = { directive['name'] for directive in result.data['__schema']['directives'] }
+    assert "oneOf" in directives
+
+
+def run_test(test: Callable):
+    print("\n" + test.__name__.replace('_', ' ') + ": ", end="")
+    try:
+        test()
+        print("PASS")
+    except:
+        print("FAIL")
+        traceback.print_exc()
+
+def run_tests():
+    run_test(test_field_directive_schema_export)
+    run_test(test_one_of_schema_export)
+    run_test(test_field_directive_introspection)
+    run_test(test_one_of_introspection)
+
+if __name__ == '__main__':
+    run_tests()

one_of_directive.py

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+
+
+from fastapi import FastAPI
+import strawberry
+from strawberry.fastapi import GraphQLRouter
+
+@strawberry.input(one_of=True)
+class TestInput:
+    a: str | None = strawberry.UNSET
+    b: str | None = strawberry.UNSET
+
+@strawberry.type
+class Query:
+    @strawberry.field
+    def test(x: TestInput) -> str:
+        return "Test"
+
+schema = strawberry.Schema(Query)
+
+router = GraphQLRouter(schema, prefix='/graphql', graphql_ide="apollo-sandbox")
+app = FastAPI()
+app.include_router(router)
+

requirements.txt

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+annotated-types==0.7.0
+anyio==4.6.0
+click==8.1.7
+fastapi==0.115.0
+graphql-core==3.2.4
+h11==0.14.0
+idna==3.10
+libcst==1.4.0
+markdown-it-py==3.0.0
+mdurl==0.1.2
+pydantic==2.9.2
+pydantic_core==2.23.4
+Pygments==2.18.0
+python-dateutil==2.9.0.post0
+python-multipart==0.0.10
+PyYAML==6.0.2
+rich==13.8.1
+shellingham==1.5.4
+six==1.16.0
+sniffio==1.3.1
+starlette==0.38.6
+strawberry-graphql==0.243.1
+typer==0.12.5
+typing_extensions==4.12.2
+uvicorn==0.30.6