Initial Checks

• I have searched GitHub for a duplicate issue and I'm sure this is something new
• I have searched Google & StackOverflow for a solution and couldn't find anything
• I have read and followed the docs and still think this is a bug
• I am confident that the issue is with pydantic (not my code, or another library in the ecosystem like FastAPI or mypy)

Description

when instanciating a dataclass where a property is a list or dict of another dataclass, it causes this error:

extra fields not permitted (type=value_error.extra)

Example Code

from pydantic import Extra
from pydantic.dataclasses import dataclass


class ExtraPropertiesForbidden:
    extra = Extra.forbid


@dataclass(config=ExtraPropertiesForbidden)
class Bar:
    ...


@dataclass(config=ExtraPropertiesForbidden)
class Foo:
    a: list[Bar]


a = Foo(a=[Bar()])  # error: extra fields not permitted (type=value_error.extra)

Python, Pydantic & OS Version

this issue seems to have been introduced after the 1.9.1 release. this occurred after installing the latest commit from master:

pip uninstall pydantic
pip install git+https://github.com/samuelcolvin/pydantic.git@a69136d2096e327ed48954a298c775dceb1551d1

pydantic version: 1.9.0
            pydantic compiled: False
                 install path: C:\Users\chungus\AppData\Local\pypoetry\Cache\virtualenvs\project-e01-Hfn1-py3.10\Lib\site-packages\pydantic
               python version: 3.10.6 (tags/v3.10.6:9c7b4bd, Aug  1 2022, 21:53:49) [MSC v.1932 64 bit (AMD64)]
                     platform: Windows-10-10.0.19042-SP0
     optional deps. installed: ['typing-extensions']

Affected Components

• Compatibility between releases
• Data validation/parsing
• Data serialization - .dict() and .json()
• JSON Schema
• Dataclasses
• Model Config
• Field Types - adding or changing a particular data type
• Function validation decorator
• Generic Models
• Other Model behaviour - construct(), pickling, private attributes, ORM mode
• Settings Management
• Plugins and integration with other tools - mypy, FastAPI, python-devtools, Hypothesis, VS Code, PyCharm, etc.