Trait SelectExt 

pub trait SelectExt {
    // Provided method
    fn exists<C>(self, db: &C) -> Result<bool, DbErr>
       where C: ConnectionTrait,
             Self: Sized { ... }
}

Helper trait for selectors with convenient methods

Provided Methods

fn exists<C>(self, db: &C) -> Result<bool, DbErr>

where C: ConnectionTrait, Self: Sized,

Check if any records exist

Dyn Compatibility

This trait is dyn compatible.

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

Implementors

impl<E> SelectExt for Select<E>

where E: EntityTrait,

impl<E, F> SelectExt for SelectTwo<E, F>

where E: EntityTrait, F: EntityTrait,

impl<E, F, G, H, I, J, TOP> SelectExt for SelectSix<E, F, G, H, I, J, TOP>

where E: EntityTrait, F: EntityTrait, G: EntityTrait, H: EntityTrait, I: EntityTrait, J: EntityTrait, TOP: Topology,

impl<E, F, G, H, I, TOP> SelectExt for SelectFive<E, F, G, H, I, TOP>

where E: EntityTrait, F: EntityTrait, G: EntityTrait, H: EntityTrait, I: EntityTrait, TOP: Topology,

impl<E, F, G, H, TOP> SelectExt for SelectFour<E, F, G, H, TOP>

where E: EntityTrait, F: EntityTrait, G: EntityTrait, H: EntityTrait, TOP: Topology,

impl<E, F, G, TOP> SelectExt for SelectThree<E, F, G, TOP>

where E: EntityTrait, F: EntityTrait, G: EntityTrait, TOP: Topology,

impl<S> SelectExt for Selector<S>

where S: SelectorTrait,

impl<S> SelectExt for SelectorRaw<S>

where S: SelectorTrait,