Struct AggregateCount 

pub struct AggregateCount<'a, M: 'static, PK: 'static> { /* private fields */ }

Implementations

impl<'a, M: 'static, PK: 'static> AggregateCount<'a, M, PK>

pub fn where_(self, filter: Filter) -> Self

pub fn where_expr(self, filter: FilterExpr) -> Self

pub fn where_any(self, filters: impl IntoIterator<Item = FilterExpr>) -> Self

pub fn where_optional<F>(self, filter: Option<F>) -> Self

where F: Into<FilterExpr>,

pub fn preview_scoped_sql(&self, ctx: &CratestackContext) -> String

The exact COUNT(*) SQL this would run, without executing it — built by the same build_query that run/run_in_tx use, so this can’t drift from what actually gets sent (unlike a hand-rolled preview string-builder). No live DB connection is required: QueryBuilder assembly is pure string/bind-slot bookkeeping.

pub async fn run(self, ctx: &CratestackContext) -> Result<i64, CratestackError>

pub async fn run_in_tx<'tx>( self, tx: &mut Transaction<'tx, Postgres>, ctx: &CratestackContext, ) -> Result<i64, CratestackError>

Trait Implementations

impl<'a, M: Clone + 'static, PK: Clone + 'static> Clone for AggregateCount<'a, M, PK>

fn clone(&self) -> AggregateCount<'a, M, PK>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, M: 'static, PK: 'static> From<FindMany<'a, M, PK>> for AggregateCount<'a, M, PK>

Reuses the exact filters a find_many builder assembled for a FindMany, discarding order_by/limit/offset/for_update — meaningless for a scalar COUNT(*). Both FindMany::run and AggregateCount::run push their WHERE clause through the same [push_scoped_conditions] with the same descriptor and [ReadPolicyKind::List], so transferring filters verbatim (rather than re-deriving them from the caller’s query a second time) is what guarantees the count can’t apply a different WHERE clause or policy scope than the page it describes — see cratestack#570, whose whole risk was exactly that kind of divergence.

fn from(find_many: FindMany<'a, M, PK>) -> Self

Converts to this type from the input type.