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75 lines
2.1 KiB
Python
75 lines
2.1 KiB
Python
from pydantic import BaseModel, Field, create_model
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from typing import Generic, Optional, TypeVar
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T = TypeVar("T", bound=BaseModel)
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class MaybeBase(BaseModel, Generic[T]):
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"""
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Extract a result from a model, if any, otherwise set the error and message fields.
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"""
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result: Optional[T]
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error: bool = Field(default=False)
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message: Optional[str]
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def __bool__(self) -> bool:
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return self.result is not None
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def Maybe(model: type[T]) -> type[MaybeBase[T]]:
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"""
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Create a Maybe model for a given Pydantic model. This allows you to return a model that includes fields for `result`, `error`, and `message` for sitatations where the data may not be present in the context.
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## Usage
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```python
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from pydantic import BaseModel, Field
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from instructor import Maybe
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class User(BaseModel):
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name: str = Field(description="The name of the person")
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age: int = Field(description="The age of the person")
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role: str = Field(description="The role of the person")
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MaybeUser = Maybe(User)
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```
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## Result
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```python
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class MaybeUser(BaseModel):
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result: Optional[User]
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error: bool = Field(default=False)
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message: Optional[str]
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def __bool__(self):
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return self.result is not None
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```
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Parameters:
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model (Type[BaseModel]): The Pydantic model to wrap with Maybe.
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Returns:
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MaybeModel (Type[BaseModel]): A new Pydantic model that includes fields for `result`, `error`, and `message`.
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"""
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return create_model(
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f"Maybe{model.__name__}",
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__base__=MaybeBase,
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result=(
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Optional.__getitem__(model),
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Field(
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default=None,
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description="Correctly extracted result from the model, if any, otherwise None",
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),
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),
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error=(bool, Field(default=False)),
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message=(
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Optional[str],
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Field(
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default=None,
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description="Error message if no result was found, should be short and concise",
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),
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),
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)
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