Method upsert

collab/src/util.rs:349–366

(&self, txn: &mut TransactionMut, id: &str)

  }

  fn upsert<V>(&self, txn: &mut TransactionMut, id: &str) -> V
  where
    V: DefaultPrelim + TryFrom<Out>,
  {
    match self.index_by_id(txn, id) {
      None => self.push_back(txn, V::default_prelim()),
      Some(i) => {
        let out = self.get(txn, i).unwrap();
        match V::try_from(out) {
          Ok(shared_ref) => shared_ref,
          Err(_) => {
            self.remove(txn, i);
            self.push_back(txn, V::default_prelim())
          },
        }
      },
    }
  }
}

impl<T> ArrayExt for T where T: Array {}