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use expression::Expression;
use expression::aliased::Aliased;
use query_builder::*;
use query_source::QuerySource;
pub trait WithDsl<'a, Expr> {
type Output: AsQuery;
fn with(self, expr: Aliased<'a, Expr>) -> Self::Output;
}
impl<'a, T, Expr> WithDsl<'a, Expr> for T where
T: QuerySource + AsQuery,
T::Query: WithDsl<'a, Expr>
{
type Output = <T::Query as WithDsl<'a, Expr>>::Output;
fn with(self, expr: Aliased<'a, Expr>) -> Self::Output {
self.as_query().with(expr)
}
}
#[doc(hidden)]
pub struct WithQuerySource<'a, Left, Right> {
left: Left,
right: Aliased<'a, Right>,
}
impl<'a, Left, Right> WithQuerySource<'a, Left, Right> {
pub fn new(left: Left, right: Aliased<'a, Right>) -> Self {
WithQuerySource {
left: left,
right: right,
}
}
}
impl<'a, Left, Right> QuerySource for WithQuerySource<'a, Left, Right> where
Left: QuerySource,
Aliased<'a, Right>: QuerySource + Expression,
{
fn from_clause(&self, out: &mut QueryBuilder) -> BuildQueryResult {
try!(self.left.from_clause(out));
out.push_sql(", ");
self.right.from_clause(out)
}
}