Exception thrown when running with Pydantic 2.12

[tjstjsgt]

Describe the bug
Exception thrown during generation.

Dependencies

Input cmd:

python -m protobuf_to_pydantic --info

Result:

current working directory:  [REDACTED]
python version: sys.version_info(major=3, minor=14, micro=0, releaselevel='final', serial=0)

############# dependencies ############## 
    grpc:            Not Install
    pydantic:        2.12.0

########## Expand dependencies ########## 
    mypy-protobuf:   3.5.0
    toml:            Not Install

########## Format dependencies ########## 
    autoflake:       Not Install
    black:           Not Install
    isort:           Not Install

Protobuf File Content

Filename: proto/demo1.proto

package demo1;

message Demo1{};

CLI(if use plugin mode)

mkdir out
protoc --proto_path=./proto \
--python_out=out \
--pyi_out=out \
--protobuf-to-pydantic_out=out \
./proto/demo.proto 

Output content

'pydantic_core._pydantic_core.ValidationInfo' object has no attribute 'template'
Traceback (most recent call last):
  File "[REDACTED]/python3.14/site-packages/protobuf_to_pydantic/plugin/main.py", line 14, in main
    CodeGen(ConfigModel)
    ~~~~~~~^^^^^^^^^^^^^
  File "[REDACTED]/python3.14/site-packages/protobuf_to_pydantic/plugin/code_gen.py", line 32, in __init__
    self.gen_config()
    ~~~~~~~~~~~~~~~^^
  File "[REDACTED]/python3.14/site-packages/protobuf_to_pydantic/plugin/code_gen.py", line 141, in gen_config
    self.config = self.config_class()
                  ~~~~~~~~~~~~~~~~~^^
  File "[REDACTED]/python3.14/site-packages/pydantic/main.py", line 250, in __init__
    validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
  File "[REDACTED]/python3.14/site-packages/protobuf_to_pydantic/plugin/config.py", line 145, in after_init
    values.template_instance = values.template(values.local_dict, values.comment_prefix)
                               ^^^^^^^^^^^^^^^
AttributeError: 'pydantic_core._pydantic_core.ValidationInfo' object has no attribute 'template'

Expected behavior
Protos generated as normal

Screenshots
N/A

Additional context
Working with Pydantic 2.11, started occurring with Pydantic 2.12 update

[Viicos]

Pydantic maintainer here. The @model_validator signatures used in this project are invalid, and used to accidentally work in Pydantic < 2.12. Refer to the documentation to check the right signature to use.

See also the relevant blog post entry.