Struct Rows

pub struct Rows<'inner, S> { /* private fields */ }

Rows keeps track of all rows in the current query.

This is the base type for other query types like crate::args::Aggregate and crate::args::Query. It contains most query functionality like joining tables and doing sub-queries.

Rows mutability is only about which rows are included. Adding new columns does not require mutating Rows.

Implementations

impl<'inner, S> Rows<'inner, S>

pub fn join<T: Table<Schema = S>>(&mut self) -> Column<'inner, S, T>

Join a table, this is like a super simple Iterator::flat_map but for queries.

After this operation Rows has rows for the combinations of each original row with each row of the table. (Also called the “Carthesian product”)

For convenience there is also Table::join.

pub fn filter(&mut self, prop: impl IntoColumn<'inner, S, Typ = bool>)

Filter rows based on a column.

pub fn filter_some<Typ>( &mut self, val: impl IntoColumn<'inner, S, Typ = Option<Typ>>, ) -> Column<'inner, S, Typ>

Filter out rows where this column is None.

Returns a new column with the unwrapped type.