validate_assignment with side effect validators

[art049]

Bug

Output of python -c "import pydantic.utils; print(pydantic.utils.version_info())":

             pydantic version: 1.7.2
            pydantic compiled: True
                 install path: /home/arthur/Documents/odmantic/.venv/lib/python3.8/site-packages/pydantic
               python version: 3.8.1 (default, Jan  5 2020, 23:12:00)  [GCC 7.3.0]
                     platform: Linux-4.17.14-041714-generic-x86_64-with-glibc2.27
     optional deps. installed: ['typing-extensions']

from pydantic import root_validator, BaseModel

class Rectangle(BaseModel):
    width: float
    height: float
    area: float = None

    class Config:
        validate_assignment = True

    @root_validator()
    def set_ts_now(cls, v):
        v["area"] = v["width"] * v["height"]
        return v

r = Rectangle(width=1, height=1)
assert r.area == 1
r.height = 5
assert r.area == 5 # AssertionError, r.area has not been modified

I don't know if it should be allowed to use validators this way or if it's a real bug.
I'd be happy to try to implement a fix 😄

[PrettyWood]

Hi @art049
Yes you're right. Since #1971 has been solved, this is the expected behaviour but it seems we update only the current field and not all. I can make a quick fix if you want should take couple of minutes

[art049]

Thanks @PrettyWood !