Trait ModelWithPk 

pub trait ModelWithPk: Model {
    // Required methods
    fn pk_value(&self) -> FilterValue;
    fn get_column_value(&self, column: &str) -> Option<FilterValue>;
}

Runtime access to a model’s primary key and column values.

Used by relation loaders (parent → child FK bucketing) and by upsert to build the conflict-row lookup. Implemented by codegen for every #[derive(Model)] struct and every prax_schema!-generated model.

Both methods return a crate::filter::FilterValue that mirrors exactly what the matching From<T> impl on the binding side would produce, so a PK value extracted here is a drop-in replacement for the same value produced by an equivalent type-checked filter.

Required Methods

fn pk_value(&self) -> FilterValue

Primary-key value for this row.

Single-column PKs return the appropriate scalar variant. Composite PKs collapse to crate::filter::FilterValue::List in the same declaration order as Model::PRIMARY_KEY.

fn get_column_value(&self, column: &str) -> Option<FilterValue>

Look up a column by its SQL name.

Returns None for column names not present in Model::COLUMNS. The relation executor uses this to extract foreign-key values from a fetched parent row without knowing the concrete FK type.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors