当我试图返回存储在两个模型之间关系中的数据时,我得到一个错误。更多信息如下。
models.py
(相关模型是 Company
和 Address
)
from datetime import datetime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from sqlalchemy import Column, Integer, String, Date, Sequence, ForeignKey, DateTime
try:
from .functions import to_camelcase
except:
from functions import to_camelcase
Base = declarative_base()
class ToDictMixin(object):
def to_dict(self, camelcase=True):
if camelcase:
return {to_camelcase(column.key): getattr(self, attr) for attr, column in self.__mapper__.c.items()}
else:
return {column.key: getattr(self, attr) for attr, column in self.__mapper__.c.items()}
class TimestampMixin(object):
record_created = Column('record_created', DateTime, default=datetime.now())
class Company(Base, ToDictMixin, TimestampMixin):
__tablename__ = 'companies'
number = Column(Integer, primary_key=True)
name = Column(String)
incorporated = Column(Date)
address = relationship("Address", back_populates="occupier")
def __repr__(self):
return f"<Company(number='{self.number}', name='{self.name}', incorporated='{self.incorporated.isoformat}')>"
class Address(Base, ToDictMixin, TimestampMixin):
__tablename__ = 'addresses'
id = Column(Integer, primary_key=True)
address_line1 = Column(String)
address_line2 = Column(String)
address_line3 = Column(String)
po_box = Column(String)
post_town = Column(String)
county = Column(String)
postcode = Column(String)
country = Column(String)
occupier_id = Column(Integer, ForeignKey("companies.number"))
occupier = relationship("Company", back_populates="address")
schemas.py
import datetime
from pydantic import BaseModel, BaseConfig
from typing import List
from functions import to_camelcase
class APIBase(BaseModel):
class Config(BaseConfig):
orm_mode = True
alias_generator = to_camelcase
allow_population_by_field_name = True
class AddressBase(APIBase):
address_line1 : str
postcode: str
class AddressCreate(AddressBase):
pass
class Address(AddressBase):
address_line2 : str
address_line3 : str
po_box : str
post_town : str
county : str
postcode : str
country : str
class CompanyBase(APIBase):
number: int
name: str
class CompanyCreate(CompanyBase):
incorporated : datetime.date
class Company(CompanyBase):
incorporated : datetime.date
address: Address
相关电话 main.py
:
@app.get("/companies", response_model=List[schemas.Company])
def get_companies(
year: int = None, month: int = None, day: int = None, number: int = None,
name: str = None, db: Session = Depends(get_db)):
name = name.upper() if name else None
arguments = locals()
arguments.pop("db")
if not any(arguments.values()):
return None
myquery = db.query(models.Company)
datedict = {}
for key, value in arguments.items():
if key == "number" and datedict:
myquery = crud.get_company_by_date(db, **datedict)
if not value:
continue
if key == 'year' or key == 'month' or key == 'day':
datedict[key] = value
else:
myquery = crud.filter_query(myquery, **{key:value})
return myquery.all()
现在,据我从文档中得知,我已经把一切都设置好了。当我移除 address: Address
这个调用将返回正确的company公司,但没有地址数据。
我已经通过测试检查相关的地址数据是否与公司模型相关联。
>>> x = SESSION.query(Company).filter_by(number=12544331).one_or_none()
>>> x.address[0].address_line1
'4 VICTORIA COURT'
因此,在尝试将地址数据包含在结果中之前,我知道数据在地址表中,关系设置正确,模型和模式工作。然而,当我尝试访问 http://127.0.0.1:8000/companies?number=12544331
我得到内部服务器错误和以下错误信息。
INFO: 127.0.0.1:50928 - "GET /companies?number=12544331 HTTP/1.1" 500 Internal Server Error
ERROR: Exception in ASGI application
Traceback (most recent call last):
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\uvicorn\protocols\http\h11_impl.py", line 384, in run_asgi
result = await app(self.scope, self.receive, self.send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\uvicorn\middleware\proxy_headers.py", line 45, in __call__
return await self.app(scope, receive, send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\fastapi\applications.py", line 149, in __call__
await super().__call__(scope, receive, send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\applications.py", line 102, in __call__
await self.middleware_stack(scope, receive, send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\middleware\errors.py", line 181, in __call__
raise exc from None
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\middleware\errors.py", line 159, in __call__
await self.app(scope, receive, _send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\exceptions.py", line 82, in __call__
raise exc from None
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\exceptions.py", line 71, in __call__
await self.app(scope, receive, sender)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\routing.py", line 550, in __call__
await route.handle(scope, receive, send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\routing.py", line 227, in handle
await self.app(scope, receive, send)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\starlette\routing.py", line 41, in app
response = await func(request)
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\fastapi\routing.py", line 204, in app
response_data = await serialize_response(
File "c:\users\admin\google~1\python\new_co~1\env\lib\site-packages\fastapi\routing.py", line 126, in serialize_response
raise ValidationError(errors, field.type_)
pydantic.error_wrappers.ValidationError: 8 validation errors for Company
response -> 0 -> address -> addressLine1
field required (type=value_error.missing)
response -> 0 -> address -> postcode
field required (type=value_error.missing)
response -> 0 -> address -> addressLine2
field required (type=value_error.missing)
response -> 0 -> address -> addressLine3
field required (type=value_error.missing)
response -> 0 -> address -> poBox
field required (type=value_error.missing)
response -> 0 -> address -> postTown
field required (type=value_error.missing)
response -> 0 -> address -> county
field required (type=value_error.missing)
response -> 0 -> address -> country
field required (type=value_error.missing)
它似乎认为地址数据不在那里 It seems to think that the address data isn't there. 我想这应该是与 orm_mode
在 schemas.py
因为有懒惰加载,但我有 orm_mode
设为 True
以避免这种情况(见 https:/fastapi.tiangolo.comtutorialsql-databases#technical-details-about-orm-mode。).
请问,我遗漏了什么?
事实证明,这是由于我的关系定义在 models.py
. SQLAlchemy文档在这里解释了它。https:/docs.sqlalchemy.orgen13ormbasic_relationships.html#一对一。
调整后的代码。
class Company(Base, ToDictMixin, TimestampMixin):
__tablename__ = 'companies'
number = Column(Integer, primary_key=True)
name = Column(String)
incorporated = Column(Date)
address = relationship("Address", uselist=False, back_populates="occupier")
def __repr__(self):
return f"<Company(number='{self.number}', name='{self.name}', incorporated='{self.incorporated.isoformat}')>"
注意到使用了 uselist=False