Remove redundant instance variables "context" and "instance" (#11)

The following two instance variables "context" and "instance" are no
longer set in the "from_django" function as these have no use.

The "dump" parameter is also removed, as it was added by mistake in the
refactor to accomodate pydantic 2.

fixes #10

djantic/main.py

@@ -251,24 +251,18 @@ def from_orm(cls, *args, **kwargs):
         return cls.from_django(*args, **kwargs)
 
     @classmethod
-    def from_django(cls, objs, many=False, context={}, dump=False):
-        # TODO is context really passed into model_validate, test this
-        cls.context = context
+    def from_django(cls, objs, many=False, context={}):
         if many:
             result_objs = []
             for obj in objs:
-                cls.instance = obj
                 obj = ProxyGetterNestedObj(obj, cls)
                 instance = cls(**obj.dict())
-                result_objs.append(cls.model_validate(instance))
+                result_objs.append(cls.model_validate(instance, context=context))
             return result_objs
 
-        cls.instance = objs
-        # NOTE question mark around the code above.
-
         obj = ProxyGetterNestedObj(objs, cls)
         instance = cls(**obj.dict())
-        return cls.model_validate(instance)
+        return cls.model_validate(instance, context=context)
 
 
 _is_base_model_class_defined = True

tests/test_fields.py

@@ -2,6 +2,12 @@
 from pydantic import ConfigDict
 from testapp.models import Configuration, Listing, Preference, Record, Searchable, User
 
+from pydantic import (
+    ValidationInfo,
+    field_validator,
+    ValidationError,
+)
+
 from djantic import ModelSchema
 
 
@@ -33,6 +39,34 @@ class UserSchema(ModelSchema):
     }
 
 
+@pytest.mark.django_db
+def test_context_for_field():
+
+    def get_context():
+        return {'check_title': lambda x: x.istitle()}
+
+    class UserSchema(ModelSchema):
+        model_config = ConfigDict(
+            model=User,
+            revalidate_instances='always'
+        )
+
+        @field_validator('first_name', mode="before", check_fields=False)
+        @classmethod
+        def validate_first_name(cls, v: str, info: ValidationInfo):
+            if not info.context:
+                return v
+
+            check_title = info.context.get('check_title')
+            if check_title and not check_title(v):
+                raise ValueError('First name needs to be a title')
+            return v
+
+    user = User.objects.create(first_name="hello", email="a@a.com")
+    with pytest.raises(ValidationError):
+        UserSchema.from_django(user, context=get_context())
+
+
 @pytest.mark.django_db
 def test_unhandled_field_type():
     class SearchableSchema(ModelSchema):