如何用tortoise-orm连多个库？

[zyxbcde]

本项目中，数据库用的是db_url形式传进去的，但是我的项目中连了俩数据库，我尝试在start_up阶段用tortoise.init把我数据库的db_config读进来，但是配置多个数据库后，每个model需要指定app，项目中内置的model没有配置app，就会导致报错。
这里我尝试自己改，但是实在没有思路...

[long2ice]

看一下代码

[zyxbcde]

# main.py
from rearq import ReArq
from tortoise import Tortoise, connections

rearq = ReArq(db_url='mysql://root:123456@127.0.0.1:3306/rearq')

db_config = {
    "connections": {
        "data": {
            "engine": "tortoise.backends.mysql",
            "credentials": {
                "database": "data",
                "host": "127.0.0.1",
                "password": "123456",
                "port": 3306,
                "user": "root",
            },
        },
        "big_data": {
            "engine": "tortoise.backends.mysql",
            "credentials": {
                "database": "big_data",
                "host": "127.0.0.1",
                "password": "123456",
                "port": 3306,
                "user": "root",
            },
        },
        "default": {
            "engine": "tortoise.backends.mysql",
            "credentials": {
                "database": "rearq",
                "host": "127.0.0.1",
                "password": "123456",
                "port": 3306,
                "user": "root",
            },
        },
    },
    "apps": {
        "data": {"models": [], "default_connection": "data"},
        "big_data": {"models": [], "default_connection": "big_data"},
        "rearq": {"models": ["rearq.server.models"], "default_connection": "default"},
    },
    "timezone": 'Asia/Shanghai'
}


@rearq.on_shutdown
async def on_shutdown():
    # you can do some clean work here like close db and so on...
    connections.close_all()
    print("shutdown")


@rearq.on_startup
async def on_startup():
    # you should do some initialization work here
    await Tortoise.init(config=db_config)
    print("startup")


@rearq.task(queue="q1")
async def add(self, a, b):
    return a + b

#app.py
import uvicorn
from fastapi import FastAPI

from main import rearq
from rearq.server.app import app as rearq_app

app = FastAPI()

app.mount("/rearq", rearq_app)
rearq_app.set_rearq(rearq)

if __name__ == '__main__':
    uvicorn.run(app="app:app", host="0.0.0.0", port=8999)

"""
exception:
  File "/Users/zhouyuxin/Library/Caches/pypoetry/virtualenvs/rearq-test-5bSWUw0w-py3.10/lib/python3.10/site-packages/rearq/server/routes/index.py", line 26, in index
    run_times = await JobResult.all().count()
  File "/Users/aaa/Library/Caches/pypoetry/virtualenvs/rearq-test-5bSWUw0w-py3.10/lib/python3.10/site-packages/tortoise/models.py", line 1277, in all
    db = using_db or cls._choose_db()
  File "/Users/aaa/Library/Caches/pypoetry/virtualenvs/rearq-test-5bSWUw0w-py3.10/lib/python3.10/site-packages/tortoise/models.py", line 1033, in _choose_db
    db = router.db_for_read(cls)
  File "/Users/aaa/Library/Caches/pypoetry/virtualenvs/rearq-test-5bSWUw0w-py3.10/lib/python3.10/site-packages/tortoise/router.py", line 36, in db_for_read
    return self._db_route(model, "db_for_read")
  File "/Users/aaa/Library/Caches/pypoetry/virtualenvs/rearq-test-5bSWUw0w-py3.10/lib/python3.10/site-packages/tortoise/router.py", line 31, in _db_route
    return connections.get(self._router_func(model, action))
  File "/Users/aaa/Library/Caches/pypoetry/virtualenvs/rearq-test-5bSWUw0w-py3.10/lib/python3.10/site-packages/tortoise/router.py", line 18, in _router_func
    for r in self._routers:
TypeError: 'NoneType' object is not iterable
"""

[long2ice]

你试试最新的dev代码

[zyxbcde]

解决了，打开方式不对，相关提示留给后来人。
一是要注意在fastapi里mount_app时候的执行顺序，需要先register_tortoise
二是注意在数据库的config字典的填写方式，apps里面必须有个app叫rearq，connection的名字可以随便起。
再次感谢。

[long2ice]

好的