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import textwrap
from typing import Any
import pytest
import strawberry
from strawberry.annotation import StrawberryAnnotation
from strawberry.exceptions import (
FieldWithResolverAndDefaultFactoryError,
FieldWithResolverAndDefaultValueError,
)
from strawberry.extensions.field_extension import FieldExtension
from strawberry.types.field import StrawberryField
def test_field_with_resolver_default():
with pytest.raises(FieldWithResolverAndDefaultValueError):
@strawberry.type
class Query:
@strawberry.field(default="potato")
def fruit(self) -> str:
return "tomato"
def test_field_with_separate_resolver_default():
def fruit_resolver() -> str: # pragma: no cover
return "strawberry"
with pytest.raises(FieldWithResolverAndDefaultValueError):
@strawberry.type
class Query:
weapon: str = strawberry.field(default="banana", resolver=fruit_resolver)
def test_field_with_resolver_default_factory():
with pytest.raises(FieldWithResolverAndDefaultFactoryError):
@strawberry.type
class Query:
@strawberry.field(default_factory=lambda: "steel")
def metal(self) -> str:
return "iron"
def test_extension_changing_field_return_value():
"""Ensure that field extensions can change the field's return type."""
class ChangeReturnTypeExtension(FieldExtension):
def apply(self, field: StrawberryField) -> None:
field.type_annotation = StrawberryAnnotation.from_annotation(int)
def resolve(self, next_, source, info, **kwargs: Any):
return next_(source, info, **kwargs)
@strawberry.type
class Query:
@strawberry.field(extensions=[ChangeReturnTypeExtension()])
def test_changing_return_type(self) -> bool: ...
schema = strawberry.Schema(query=Query)
expected = """\
type Query {
testChangingReturnType: Int!
}
"""
assert str(schema) == textwrap.dedent(expected).strip()
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