Trait AppearsOnTable 

pub trait AppearsOnTable<QS: ?Sized>: Expression { }

Indicates that all elements of an expression are valid given a from clause.

This is used to ensure that users.filter(posts::id.eq(1)) fails to compile. This constraint is only used in places where the nullability of a SQL type doesn’t matter (everything except select and returning). For places where nullability is important, SelectableExpression is used instead.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<'a, T, QS> AppearsOnTable<QS> for &'a T

where T: AppearsOnTable<QS> + ?Sized, &'a T: Expression,

impl<T, QS> AppearsOnTable<QS> for Arc<T>

where T: AppearsOnTable<QS> + ?Sized, Arc<T>: Expression,

impl<T, QS> AppearsOnTable<QS> for Box<T>

where T: AppearsOnTable<QS> + ?Sized, Box<T>: Expression,

impl<T, QS> AppearsOnTable<QS> for Rc<T>

where T: AppearsOnTable<QS> + ?Sized, Rc<T>: Expression,

Implementors

impl<L, R, QS> AppearsOnTable<QS> for Concat<L, R>

where Concat<L, R>: Expression, L: AppearsOnTable<QS>, R: AppearsOnTable<QS>,

impl<QS, Query, Value> AppearsOnTable<QS> for UncheckedBind<Query, Value>

where Self: Expression,

impl<QS, S, C> AppearsOnTable<QS> for AliasedField<S, C>

where S: AliasSource, QS: AppearsInFromClause<Alias<S>, Count = Once>, C: QueryRelationField<QueryRelation = S::Target>,

impl<QS, ST, T> AppearsOnTable<QS> for SqlLiteral<ST, T>

where Self: Expression,

impl<QS> AppearsOnTable<QS> for now

where now: Expression,

impl<QS> AppearsOnTable<QS> for today

where today: Expression,

impl<ST, I, QS> AppearsOnTable<QS> for Many<ST, I>

where Many<ST, I>: Expression, I: AsExpression<ST>, ST: SingleValue, <I as AsExpression<ST>>::Expression: SelectableExpression<QS>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

impl<T, C, QS> AppearsOnTable<QS> for Collate<T, C>

where T: AppearsOnTable<QS>, Collate<T, C>: Expression,

impl<T, QS> AppearsOnTable<QS> for Exists<T>

where Self: Expression, Subselect<T, Bool>: AppearsOnTable<QS>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

impl<T, U, QS> AppearsOnTable<QS> for In<T, U>

where In<T, U>: Expression, T: AppearsOnTable<QS>, U: AppearsOnTable<QS>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

impl<T, U, QS> AppearsOnTable<QS> for NotIn<T, U>

where NotIn<T, U>: Expression, T: AppearsOnTable<QS>, U: AppearsOnTable<QS>,

Available on crate feature i-implement-a-third-party-backend-and-opt-into-breaking-changes only.

impl<W, T, E, QS> AppearsOnTable<QS> for CaseWhen<CaseWhenConditionsLeaf<W, T>, ElseExpression<E>>

where CaseWhen<CaseWhenConditionsLeaf<W, T>, ElseExpression<E>>: Expression, W: AppearsOnTable<QS>, T: AppearsOnTable<QS>, E: AppearsOnTable<QS>,

impl<W, T, QS> AppearsOnTable<QS> for CaseWhen<CaseWhenConditionsLeaf<W, T>, NoElseExpression>

where CaseWhen<CaseWhenConditionsLeaf<W, T>, NoElseExpression>: Expression, W: AppearsOnTable<QS>, T: AppearsOnTable<QS>,

impl<W, T, Whens, E, QS> AppearsOnTable<QS> for CaseWhen<CaseWhenConditionsIntermediateNode<W, T, Whens>, E>

where Self: Expression, W: AppearsOnTable<QS>, T: AppearsOnTable<QS>, CaseWhen<Whens, E>: AppearsOnTable<QS>,