FastAPI中response_model验证错误

Question

fastapi中的response_model出现错误

我，我正在学习FastApi，我有这个模式:

class BasicArticle(BaseModel):
title: str
content: str
published: bool
class ArticleBase(BasicArticle):
creator_id: int
class UserInArticle(BaseModel):
id: int
username: str
class Config:
orm_mode: True
class ArticleDisplay(BasicArticle):
user: UserInArticle
class Config:
orm_mode = True

这些是我的模型:

class DbUser(Base):
__tablename__ = "users"
id = Column(Integer, primary_key=True, index=True)
username = Column(String)
email = Column(String)
password = Column(String)
items = relationship("DbArticle", back_populates="user")  
class DbArticle(Base):
__tablename__ = "articles"
id = Column(Integer, primary_key=True, index=True)
title = Column(String)
content = Column(String)
published = Column(Boolean)
user_id = Column(Integer, ForeignKey('users.id'))
user = relationship("DbUser", back_populates="items")

我在这里创建post:

def create_article(db: Session, request: ArticleBase):
new_article = DbArticle(
title=request.title,
content=request.content,
published=request.published,
user_id=request.creator_id
)
db.add(new_article)
db.commit()
db.refresh(new_article)
return new_article

最后是端点:

@router.post('/', response_model=ArticleDisplay, status_code=status.HTTP_201_CREATED)
def create_article(request: ArticleBase, db: Session = Depends(get_db)):
return db_article.create_article(db, request)

问题是:

pydantic.error_wrappers.ValidationError: 1 validation error for ArticleDisplay
response -> user
value is not a valid dict (type=type_error.dict)

类配置:orm_mode = True

应该是这样的，至少在我正在学习的课程中是这样的，但我不知道pydantic是否从课程创建的那一刻起就改变了。

感谢大家的回答

Answer 1

你的UserInArticle似乎有一个错别字模型:

class UserInArticle(BaseModel):
id: int
username: str
class Config:
orm_mode: True  # Should be "= True" and not ": True"

Answer 2

无法生成错误，但建议根据您的python版本遵循以下简单的crud。

https://github.com/tiangolo/fastapi/tree/master/docs_src/sql_databases/sql_app

参考:https://fastapi.tiangolo.com/tutorial/sql-databases/__tabbed_4_2