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__mapper_args__ = {"order_by": country_code}报错unexpected keyword argument 'order_by'，是什么原因呢

Traceback (most recent call last):

File "D:\Anaconda3\envs\fastapi\lib\runpy.py", line 194, in _run_module_as_main

return _run_code(code, main_globals, None,

File "D:\Anaconda3\envs\fastapi\lib\runpy.py", line 87, in _run_code

exec(code, run_globals)

File "c:\Users\withr\.vscode\extensions\ms-python.python-2021.3.680753044\pythonFiles\lib\python\debugpy\__main__.py", line 45, in <module>

cli.main()

File "c:\Users\withr\.vscode\extensions\ms-python.python-2021.3.680753044\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 444, in main

run()

File "c:\Users\withr\.vscode\extensions\ms-python.python-2021.3.680753044\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 285, in run_file

runpy.run_path(target_as_str, run_name=compat.force_str("__main__"))

File "D:\Anaconda3\envs\fastapi\lib\runpy.py", line 265, in run_path

return _run_module_code(code, init_globals, run_name,

File "D:\Anaconda3\envs\fastapi\lib\runpy.py", line 97, in _run_module_code

_run_code(code, mod_globals, init_globals,

File "D:\Anaconda3\envs\fastapi\lib\runpy.py", line 87, in _run_code

exec(code, run_globals)

File "run.py", line 12, in <module>

from coronavirus import applications

File "E:\SyncWorkspace\Code\PY\fastapi\fastapi_covid19\coronavirus\__init__.py", line 8, in <module>

from .main import applications

File "E:\SyncWorkspace\Code\PY\fastapi\fastapi_covid19\coronavirus\main.py", line 13, in <module>

from coronavirus import crud, schemas

File "E:\SyncWorkspace\Code\PY\fastapi\fastapi_covid19\coronavirus\crud.py", line 9, in <module>

from coronavirus import models, schemas

File "E:\SyncWorkspace\Code\PY\fastapi\fastapi_covid19\coronavirus\models.py", line 16, in <module>

class City(Base):

File "D:\Anaconda3\envs\fastapi\lib\site-packages\sqlalchemy\orm\decl_api.py", line 75, in __init__

_as_declarative(reg, cls, dict_)

File "D:\Anaconda3\envs\fastapi\lib\site-packages\sqlalchemy\orm\decl_base.py", line 126, in _as_declarative

return _MapperConfig.setup_mapping(registry, cls, dict_, None, {})

File "D:\Anaconda3\envs\fastapi\lib\site-packages\sqlalchemy\orm\decl_base.py", line 177, in setup_mapping

return cfg_cls(registry, cls_, dict_, table, mapper_kw)

File "D:\Anaconda3\envs\fastapi\lib\site-packages\sqlalchemy\orm\decl_base.py", line 314, in __init__

self._early_mapping(mapper_kw)

File "D:\Anaconda3\envs\fastapi\lib\site-packages\sqlalchemy\orm\decl_base.py", line 200, in _early_mapping

self.map(mapper_kw)

File "D:\Anaconda3\envs\fastapi\lib\site-packages\sqlalchemy\orm\decl_base.py", line 971, in map

mapper_cls(self.cls, self.local_table, **self.mapper_args),

TypeError: __init__() got an unexpected keyword argument 'order_by'

慕慕9595314

2021-04-07

源自：高性能 FastAPI 框架入门精讲 7-2

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1 回答

duskash
2021-10-04

新版本的 sqlalchemy 丢弃了 __mappter_args__ 当中设置的方法

应当用 db.query().order_by() 直接在 Query 对象后面显示地调用 order_by 函数

这节课里, 有一张 City 表和一张 Data 表, 对应的 crud 方法里面

db.query(models.City).order_by(models.City.province).offset().limit().all()

db.query(models.Data).order_by(models.Data.confirmed)....

6 回复有任何疑惑可以回复我~

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鹏鹏ff

还是有点看不明白，能详细点吗

2022-02-11 回复有任何疑惑可以回复我~

慕圣5288765 回复鹏鹏ff

def get_cities(db: Session, skip: int = 1, limit: int = 10): # return db.query(models.City).offset(skip).limit(limit).all() return db.query(models.City).order_by(models.City.country_code).offset(skip).limit(limit).all()

2022-07-06 回复有任何疑惑可以回复我~

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__mapper_args__ = {"order_by": country_code}报错unexpected keyword argument 'order_by'，是什么原因呢

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__mapper_args__ = {"order_by": country_code}报错unexpected keyword argument 'order_by'，是什么原因呢