Fix context not passed to field validators bug (#417)

pydantic_settings/main.py

@@ -193,6 +193,8 @@ def __init__(
             )
         )
 
+    __init__.__pydantic_base_init__ = True  # type: ignore
+
     @classmethod
     def settings_customise_sources(
         cls,

tests/test_settings.py

@@ -30,6 +30,8 @@
     SecretStr,
     Tag,
     ValidationError,
+    ValidationInfo,
+    field_validator,
 )
 from pydantic import (
     dataclasses as pydantic_dataclasses,
@@ -5187,6 +5189,22 @@ class Settings(BaseSettings):
     assert s.model_dump() == {'nested': {'foo': ['one', 'two']}}
 
 
+def test_validation_context():
+    class Settings(BaseSettings):
+        foo: str
+
+        @field_validator('foo')
+        @classmethod
+        def test_validator(cls, v: str, info: ValidationInfo):
+            context = info.context
+            assert context == {'foo': 'bar'}
+            return v
+
+    s = Settings.model_validate({'foo': 'foo bar'}, context={'foo': 'bar'})
+    assert s.foo == 'foo bar'
+    assert s.model_dump() == {'foo': 'foo bar'}
+
+
 def test_nested_model_field_with_alias_choices(env):
     class NestedSettings(BaseModel):
         foo: List[str] = Field(alias=AliasChoices('fooalias', 'foo-alias'))