Misplaced Field Error

Description

This error is thrown when strawberry.field() is assigned to a field of a strawberry.pydantic type, for example the following code will throw this error:

import pydantic
import strawberry
 
 
@strawberry.pydantic.type
class User(pydantic.BaseModel):
    name: str
    email: str = strawberry.field(description="The user's email")

This happens because Pydantic treats the strawberry.field() like a dataclass field: it keeps its default value and discards the rest of its options, like descriptions and permissions.

The same error is thrown when:

• strawberry.pydantic.field is used on a field of the model, in its annotation or as its default value, like age: Annotated[int, strawberry.pydantic.field(name="yearsOld")] . strawberry.pydantic.field only adds fields with a resolver, so its options would be ignored.
• a method is decorated with @strawberry.field in a base class that isn’t decorated, or in a Pydantic model that makes Pydantic ignore Strawberry fields with ignored_types . Pydantic types only read @strawberry.field methods from regular Strawberry types and interfaces, so the field would silently be missing from the schema.

How to fix this error

You can fix this error by customizing the fields of the model with strawberry.field() in their annotation, and adding fields with a resolver with @strawberry.pydantic.field :

from typing import Annotated
 
import pydantic
import strawberry
 
 
@strawberry.pydantic.type
class User(pydantic.BaseModel):
    name: str
    email: Annotated[str, strawberry.field(description="The user's email")]
    age: Annotated[int, strawberry.field(name="yearsOld")]
 
    @strawberry.pydantic.field
    def shout(self) -> str:
        return self.name.upper()

For a base class that isn't a Pydantic model, you can also decorate it with @strawberry.type or @strawberry.interface , as Pydantic types inherit the fields with a resolver of regular Strawberry types and interfaces.