copy_on_model_validation config doesn't copy List field anymore in v1.9.0 #3641
Description
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- I added a descriptive title to this issue
- I have searched (google, github) for similar issues and couldn't find anything
- I have read and followed the docs and still think this is a bug
Bug
The output of python -c "import pydantic.utils; print(pydantic.utils.version_info())" when I use v1.9.0a1,
pydantic version: 1.9.0a1
pydantic compiled: True
install path: <*my-project-dir*>/venv/lib/python3.9/site-packages/pydantic
python version: 3.9.9 (main, Nov 16 2021, 03:05:18) [GCC 7.5.0]
platform: Linux-5.4.0-91-generic-x86_64-with-glibc2.27
optional deps. installed: ['typing-extensions']
The output of python -c "import pydantic.utils; print(pydantic.utils.version_info())" when I use v1.9.0,
pydantic version: 1.9.0
pydantic compiled: True
install path: <*my-project-dir*>/venv/lib/python3.9/site-packages/pydantic
python version: 3.9.9 (main, Nov 16 2021, 03:05:18) [GCC 7.5.0]
platform: Linux-5.4.0-91-generic-x86_64-with-glibc2.27
optional deps. installed: ['typing-extensions']
Looks like there is accidental behaviour change from v1.9.0a1 to v1.9.0 regarding the copy_on_model_validation config.
from pydantic import BaseModel
from typing import List
class A(BaseModel):
name: str
class Config:
copy_on_model_validation = True # Default behaviour
class B(BaseModel):
list_a: List[A]
a = A(name="a")
b = B(list_a=[a])
print(a)
print(b)
a.name = "b" # make a change to variable a's field
print(a)
print(b)The output using v1.9.0a1,
A(name='a')
B(list_a=[A(name='a')])
A(name='b')
B(list_a=[A(name='a')])
The output using v1.9.0 changed to,
A(name='a')
B(list_a=[A(name='a')])
A(name='b')
B(list_a=[A(name='b')])