SeaQL/sea-orm · error

Failed to set value for {:?}: {e:?}

Error message

Failed to set value for {:?}: {e:?}

What it means

ModelTrait::set() writes a runtime-checked Value into a column, and the value's runtime type did not match the column's declared type (e.g. setting an integer Value on a String column, or a wrong enum/varchar variant). The message embeds the column and the underlying conversion error. This is a generic type-check guard inside the reflection/mutation layer, and the faulty input is the mismatched Value passed to set() for the named column.

Source

Thrown at sea-orm-sync/src/entity/model.rs:34

/// `#[derive(DeriveModel)]`. Pairs with an [`ActiveModelTrait`] type for
/// mutations.
pub trait ModelTrait: Clone + Debug {
    /// The [`EntityTrait`] this model belongs to.
    type Entity: EntityTrait;

    /// Read the value of one column.
    fn get(&self, c: <Self::Entity as EntityTrait>::Column) -> Value;

    /// Type of the value stored by a column, used by reflection helpers
    /// such as Arrow conversion.
    fn get_value_type(c: <Self::Entity as EntityTrait>::Column) -> ArrayType;

    /// Write a value to one column. Panics if the value's type doesn't match
    /// the column; prefer [`try_set`](Self::try_set) when the value comes
    /// from untrusted input.
    fn set(&mut self, c: <Self::Entity as EntityTrait>::Column, v: Value) {
        self.try_set(c, v)
            .unwrap_or_else(|e| panic!("Failed to set value for {:?}: {e:?}", c.as_column_ref()))
    }

    /// Write a value to one column, returning an error if the value's type
    /// does not match the column.
    fn try_set(&mut self, c: <Self::Entity as EntityTrait>::Column, v: Value) -> Result<(), DbErr>;

    /// Build a [`Select`] for models related to `self` via the
    /// `Self::Entity: Related<R>` relation. Use it together with `.one(db)` /
    /// `.all(db)` to fetch the related rows.
    fn find_related<R>(&self, _: R) -> Select<R>
    where
        R: EntityTrait,
        Self::Entity: Related<R>,
    {
        <Self::Entity as Related<R>>::find_related().belongs_to(self)
    }

    /// Build a [`Select`] that follows a multi-hop link out of `self`. The

View on GitHub (pinned to e29bcd1b41)

Solutions

1. Check the panic text for the offending column and convert the value to that column's type before calling set().
2. Prefer the typed ActiveModel API (active_model.set(Column::X, typed_value) via generated setters) so mismatches are caught at compile time instead of at runtime.
3. If values come from dynamic input, validate/decode them with the column's ArrayType (get_value_type) before set().

When it happens

Trigger: Thrown at sea-orm-sync/src/entity/model.rs:34 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of SeaQL/sea-orm@e29bcd1b41 (2026-09-10). Data as JSON: /api/errors/8fad1ac12622d18b. Report an issue: GitHub.