我有4张桌子:Hardware
、SoftwareName
、SoftwareVersion
和Software
.
Software
表与SoftwareName
表和SoftwareVersion
表有one-to-many
关系.最后,Hardware
模型与Software
表有one-to-many
关系.
我试图使用Pydantic Schema
从模型关系中获得一个特定的列.
现在我得到了以下输出:
[
{
"id": 1,
"hostname": "hostname2",
"softwares": [
{
"id": 1,
"software_name": {
"id": 1,
"name": "nginx"
},
"software_version": {
"id": 1,
"version": "2.9"
}
},
{
"id": 2,
"software_name": {
"id": 2,
"name": "vim"
},
"software_version": {
"id": 2,
"version": "0.3"
}
},
{
"id": 3,
"software_name": {
"id": 3,
"name": "apache"
},
"software_version": {
"id": 3,
"version": "1.0"
}
}
]
}
]
但我期望的是这种输出:
[
{
"id": 1,
"hostname": "hostname2",
"softwares": [
{
"id": 1,
"name": "nginx",
"version": "2.9"
},
{
"id": 2,
"name": "vim",
"version": "0.3"
},
{
"id": 3,
"name": "apache",
"version": "1.0"
}
]
}
]
我有文件main.py
:
import uvicorn
from typing import Any, Iterator, List, Optional
from faker import Faker
from fastapi import Depends, FastAPI
from pydantic import BaseModel
from sqlalchemy import Column, ForeignKey, Integer, String, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import Session, sessionmaker, relationship
from faker.providers import DynamicProvider
software_name = DynamicProvider(
provider_name="software_name",
elements=["bash", "vim", "vscode", "nginx", "apache"],
)
software_version = DynamicProvider(
provider_name="software_version",
elements=["1.0", "2.9", "1.1", "0.3", "2.0"],
)
hardware = DynamicProvider(
provider_name="hardware",
elements=["hostname1", "hostname2", "hostname3", "hostname4", "hostname5"],
)
fake = Faker()
# then add new provider to faker instance
fake.add_provider(software_name)
fake.add_provider(software_version)
fake.add_provider(hardware)
engine = create_engine("sqlite:///.db", connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=True, autoflush=True, bind=engine)
Base = declarative_base(bind=engine)
class Software(Base):
__tablename__ = 'software'
id = Column(Integer, primary_key=True)
hardware_id = Column(Integer, ForeignKey('hardware.id'))
name_id = Column(Integer, ForeignKey('software_name.id'))
version_id = Column(Integer, ForeignKey('software_version.id'))
software_name = relationship('SoftwareName', backref='software_name')
software_version = relationship('SoftwareVersion',
backref='software_version')
class SoftwareName(Base):
__tablename__ = 'software_name'
id = Column(Integer, primary_key=True)
name = Column(String)
class SoftwareVersion(Base):
__tablename__ = 'software_version'
id = Column(Integer, primary_key=True)
version = Column(String)
class Hardware(Base):
__tablename__ = "hardware"
id = Column(Integer, primary_key=True, autoincrement=True)
hostname = Column(String, nullable=False)
softwares = relationship(Software)
Base.metadata.drop_all()
Base.metadata.create_all()
class BaseSchema(BaseModel):
id: int
class Config:
orm_mode = True
class SoftwareNameSchema(BaseSchema):
name: str
class SoftwareVersionSchema(BaseSchema):
version: str
class SoftwareSchema(BaseSchema):
software_name: SoftwareNameSchema
software_version: SoftwareVersionSchema
class HardwareOut(BaseSchema):
hostname: str
softwares: List[SoftwareSchema]
app = FastAPI()
@app.on_event("startup")
def on_startup() -> None:
session = SessionLocal()
for _ in range(10):
software_list = []
for _ in range(3):
sn = SoftwareName(name=fake.software_name())
sv = SoftwareVersion(version=fake.software_version())
s = Software(software_name=sn, software_version=sv)
software_list.append(s)
h = Hardware(hostname=fake.hardware(), softwares=software_list)
session.add(h)
session.flush()
session.close()
def get_db() -> Iterator[Session]:
db = SessionLocal()
try:
yield db
finally:
db.close()
@app.get("/hardwares", response_model=List[HardwareOut])
def get_hardwares(db: Session = Depends(get_db)) -> Any:
return [HardwareOut.from_orm(hardware) for hardware in db.query(Hardware).all()]
如何更改HardwareOut
模式以返回预期的结果?