Trait Entity 

pub trait Entity<'a, DB> {
    type Table;

    // Required methods
    fn conditions<M: PersistedFields>(
        conditions: Conditions<M>,
        junction: Junction,
    ) -> Result<Option<BoxedCondition<'a, Self::Table, DB>>, ValueMismatch>;
    fn order_by<M: PersistedFields>(
        sort_keys: SortKeys<M>,
    ) -> Vec<BoxedOrdering<'a, Self::Table, DB>>;
}

A Diesel entity: one whose columns the model’s data can name, implemented by #[derive(Columns)] for an entity with #[diesel(table_name = ..)].

Its methods are the entity’s diesel_conditions and diesel_order_by as a trait, so the code generated for the wrappers (AppendToQuery, AppendConditions), which knows the entity but not its table, can name them. DB is the backend, 'a how long the boxed expressions live.

Required Associated Types

type Table

The entity’s table (table_name::table).

Required Methods

fn conditions<M: PersistedFields>( conditions: Conditions<M>, junction: Junction, ) -> Result<Option<BoxedCondition<'a, Self::Table, DB>>, ValueMismatch>

The conditions of the model M, joined by junction, as one condition on the table; None when there are none.

Errors

ValueMismatch if a condition’s value does not fit its column’s SQL type.

fn order_by<M: PersistedFields>( sort_keys: SortKeys<M>, ) -> Vec<BoxedOrdering<'a, Self::Table, DB>>

The sort keys of the model M, in order, as orderings of the table.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors