reflex-dev/reflex · error · VarAttributeError

The State var `{self!s}` of type {escape(str(self._var_type)

Error message

The State var `{self!s}` of type {escape(str(self._var_type))} has no attribute '{name}' or may have been annotated wrongly.

What it means

ObjectVar.__getattr__ resolves attribute access on a var of some annotated type. If the type annotation does not actually declare the requested attribute, Reflex cannot determine the attribute's type to build the JS accessor, and raises VarAttributeError suggesting the annotation may be wrong.

Source

Thrown at packages/reflex-base/src/reflex_base/vars/object.py:354

            # Resolve the raw descriptor once and reuse it. A HybridProperty resolves to a
            # frontend Var with this object var substituted as `self` (e.g. `State.info.a_b`);
            # any other descriptor is passed to `get_attribute_access_type` so the class
            # lookup is not repeated.
            descriptor = types.get_attribute_descriptor(fixed_type, name)
            if isinstance(descriptor, HybridProperty):
                return descriptor._get_var(self)
            attribute_type = get_attribute_access_type(var_type, name, descriptor)
        elif is_typeddict(fixed_type) or fixed_type in types.UnionTypes:
            attribute_type = get_attribute_access_type(var_type, name)
        else:
            return ObjectItemOperation.create(self, name).guess_type()

        if attribute_type is None:
            msg = (
                f"The State var `{self!s}` of type {escape(str(self._var_type))} has no attribute '{name}' or may have been annotated "
                f"wrongly."
            )
            raise VarAttributeError(msg)
        return ObjectItemOperation.create(self, name, attribute_type).guess_type()

    def contains(self, key: Var | Any) -> BooleanVar:
        """Check if the object contains a key.

        Args:
            key: The key to check.

        Returns:
            The result of the check.
        """
        return object_has_own_property_operation(self, key)


class RestProp(ObjectVar[dict[str, Any]]):
    """A special object var representing forwarded rest props."""

    def merge(self, other: ObjectVar | Mapping[str, Any]):

View on GitHub (pinned to 45b8ed5ab7)

Solutions

1. Fix the annotation to the real type (dataclass/pydantic model/TypedDict) that has the attribute.
2. Correct the typo in the attribute name used in the component.
3. If the type is dynamic, access keys via indexing (var['key']) or cast/annotate more precisely.

Example fix

# before
class State(rx.State):
    user: dict = {}
# rx.text(State.user.name)  -> VarAttributeError

# after
@dataclass
class User:
    name: str

class State(rx.State):
    user: User = User(name="")
# rx.text(State.user.name)

import dataclasses

def has_field(cls, name: str) -> bool:
    return name in getattr(cls, "__dataclass_fields__", {}) or hasattr(cls, name)

def attr_exists_on_type(tp, name: str) -> bool:
    return hasattr(tp, name) or name in getattr(tp, "__annotations__", {})

When it happens

Trigger: Accessing an attribute on a rx.Var[SomeDataclass] where SomeDataclass has no such field; annotating a var as dict/Any and then doing .prop; typos in attribute names on typed object vars.

Common situations: Annotating state vars as `dict` or a loose TypedDict but accessing them like objects; after refactoring a dataclass field name without updating frontend references; version changes where a model field was renamed or removed.

Related errors

• All parameters of `{fn_name}` must be annotated as `rx.Var[.
• HybridProperty has no getter function
• The keys and values of the object must be literal vars to ge
• Expected a mapping type or a dataclass, got {_var_value!r} o
• ChildrenTypeError(component=cls.__name__, child=child)

AI-assisted analysis of reflex-dev/reflex@45b8ed5ab7 (2026-08-28). Data as JSON: /api/errors/82a966a81a8a3b8d. Report an issue: GitHub.