Prevent users from creating messages with wrong parameters when pydantic is used (#615)

pyproject.toml

@@ -12,13 +12,12 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.7"
+python = "^3.8"
 black = { version = ">=23.1.0", optional = true }
 grpclib = "^0.4.1"
-importlib-metadata = { version = ">=1.6.0", python = "<3.8" }
 jinja2 = { version = ">=3.0.3", optional = true }
 python-dateutil = "^2.8"
-isort = {version = "^5.11.5", optional = true}
+isort = { version = "^5.11.5", optional = true }
 typing-extensions = "^4.7.1"
 betterproto-rust-codec = { version = "0.1.1", optional = true }
 
@@ -26,7 +25,7 @@ betterproto-rust-codec = { version = "0.1.1", optional = true }
 asv = "^0.4.2"
 bpython = "^0.19"
 jinja2 = ">=3.0.3"
-mypy = "^0.930"
+mypy = "^1.11.2"
 sphinx = "3.1.2"
 sphinx-rtd-theme = "0.5.0"
 pre-commit = "^2.17.0"

src/betterproto/templates/header.py.j2

@@ -5,16 +5,9 @@
 {% for i in output_file.python_module_imports|sort %}
 import {{ i }}
 {% endfor %}
-{% set type_checking_imported = False %}
 
 {% if output_file.pydantic_dataclasses %}
-from typing import TYPE_CHECKING
+from pydantic.dataclasses import dataclass
-{% set type_checking_imported = True %}
-
-if TYPE_CHECKING:
-    from dataclasses import dataclass
-else:
-    from pydantic.dataclasses import dataclass
 from pydantic.dataclasses import rebuild_dataclass
 {%- else -%}
 from dataclasses import dataclass
@@ -46,7 +39,7 @@ import grpclib
 {{ i }}
 {% endfor %}
 
-{% if output_file.imports_type_checking_only and not type_checking_imported %}
+{% if output_file.imports_type_checking_only %}
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:

src/betterproto/templates/template.py.j2

@@ -23,7 +23,11 @@ class {{ enum.py_name }}(betterproto.Enum):
 {% endfor %}
 {% endif %}
 {% for message in output_file.messages %}
+{% if output_file.pydantic_dataclasses %}
+@dataclass(eq=False, repr=False, config={"extra": "forbid"})
+{% else %}
 @dataclass(eq=False, repr=False)
+{% endif %}
 class {{ message.py_name }}(betterproto.Message):
     {% if message.comment %}
 {{ message.comment }}

tests/inputs/invalid_field/invalid_field.proto

@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package invalid_field;
+
+message Test {
+    int32 x = 1;
+}

tests/inputs/invalid_field/test_invalid_field.py

@@ -0,0 +1,17 @@
+import pytest
+
+
+def test_invalid_field():
+    from tests.output_betterproto.invalid_field import Test
+
+    with pytest.raises(TypeError):
+        Test(unknown_field=12)
+
+
+def test_invalid_field_pydantic():
+    from pydantic import ValidationError
+
+    from tests.output_betterproto_pydantic.invalid_field import Test
+
+    with pytest.raises(ValidationError):
+        Test(unknown_field=12)