use crate::expression::{
AppearsOnTable, AsExpressionList, Expression, SelectableExpression, ValidGrouping,
};
use crate::pg::Pg;
use crate::query_builder::{AstPass, QueryFragment, QueryId};
use crate::sql_types;
use std::marker::PhantomData;
#[derive(Debug, Clone, Copy, QueryId)]
pub struct ArrayLiteral<T, ST> {
elements: T,
_marker: PhantomData<ST>,
}
#[cfg(feature = "postgres_backend")]
pub fn array<ST, T>(elements: T) -> ArrayLiteral<T::Expression, ST>
where
T: AsExpressionList<ST>,
{
ArrayLiteral {
elements: elements.as_expression_list(),
_marker: PhantomData,
}
}
impl<T, ST> Expression for ArrayLiteral<T, ST>
where
ST: 'static,
T: Expression,
{
type SqlType = sql_types::Array<ST>;
}
impl<T, ST> QueryFragment<Pg> for ArrayLiteral<T, ST>
where
T: QueryFragment<Pg>,
{
fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, Pg>) -> crate::result::QueryResult<()> {
out.push_sql("ARRAY[");
QueryFragment::walk_ast(&self.elements, out.reborrow())?;
out.push_sql("]");
Ok(())
}
}
impl<T, ST, QS> SelectableExpression<QS> for ArrayLiteral<T, ST>
where
T: SelectableExpression<QS>,
ArrayLiteral<T, ST>: AppearsOnTable<QS>,
{
}
impl<T, ST, QS> AppearsOnTable<QS> for ArrayLiteral<T, ST>
where
T: AppearsOnTable<QS>,
ArrayLiteral<T, ST>: Expression,
{
}
impl<T, ST, GB> ValidGrouping<GB> for ArrayLiteral<T, ST>
where
T: ValidGrouping<GB>,
{
type IsAggregate = T::IsAggregate;
}