Method on_delete

nodedb/src/engine/kv/index.rs:414–441

Remove all index entries for a deleted primary key. `field_values` are the field values from the deleted entry.

(&mut self, primary_key: &[u8], field_values: &[(&str, &[u8])])

    ///
    /// `field_values` are the field values from the deleted entry.
    pub fn on_delete(&mut self, primary_key: &[u8], field_values: &[(&str, &[u8])]) {
        for idx in &mut self.indexes {
            for &(field, value) in field_values {
                if field == idx.field {
                    idx.remove(value, primary_key);
                    self.total_index_writes += 1;
                }
            }
        }

        // Maintain composite indexes on delete.
        for ci in &mut self.composite_indexes {
            let vals: Vec<&[u8]> = ci
                .fields
                .iter()
                .filter_map(|f| {
                    field_values
                        .iter()
                        .find(|(name, _)| *name == f.as_str())
                        .map(|(_, v)| *v)
                })
                .collect();
            if vals.len() == ci.fields.len() {
                ci.remove(&vals, primary_key);
                self.total_index_writes += 1;
            }
        }
    }

    /// Write amplification ratio: total_index_writes / total_puts.
    ///