Function fire_before_delete

nodedb/src/control/trigger/fire_before.rs:127–163

Fire BEFORE ROW triggers for a DELETE operation. BEFORE DELETE triggers cannot modify the row (there is no NEW). They can only validate and reject via RAISE EXCEPTION, or execute side-effect DML. If a trigger raises an exception, the DELETE is aborted.

(
    state: &SharedState,
    identity: &AuthenticatedIdentity,
    tenant_id: TenantId,
    collection: &str,
    old_fields: &HashMap<String, nodedb_types::Value>,
    cascade_depth: u32,
)

///
/// If a trigger raises an exception, the DELETE is aborted.
pub async fn fire_before_delete(
    state: &SharedState,
    identity: &AuthenticatedIdentity,
    tenant_id: TenantId,
    collection: &str,
    old_fields: &HashMap<String, nodedb_types::Value>,
    cascade_depth: u32,
) -> crate::Result<()> {
    let triggers =
        state
            .trigger_registry
            .get_matching(tenant_id.as_u64(), collection, DmlEvent::Delete);

    let before_triggers: Vec<_> = triggers
        .into_iter()
        .filter(|t| t.timing == TriggerTiming::Before)
        .collect();

    if before_triggers.is_empty() {
        return Ok(());
    }

    check_cascade_depth(cascade_depth, collection)?;

    let bindings = RowBindings::before_delete(collection, old_fields.clone());

    fire_triggers(
        state,
        identity,
        tenant_id,
        collection,
        &before_triggers,
        &bindings,
        cascade_depth,
    )
    .await
}