# query.fields.OneRelation

- **Module:** query.fields
- **Package:** libtmux
- **Language:** Rust
- **Kind:** struct
- **Source:** https://github.com/libtmux/libtmux-rs/blob/8a648c0894dfffc9303583f753b6c8ae01f2fe76/crates/libtmux/src/query/fields.rs#L133
- **Page:** https://libtmux.org/reference/rs/query-fields-onerelation/

A value-only handle for a to-one relation from `From` to `To`.

Relation expressions inspect only the already-loaded optional value on a
candidate and never perform I/O.

## Example

```rust
use libtmux::query::OneRelation;
use libtmux::query::__private;

struct Parent;
struct Owner;
let relation: OneRelation<Parent, Owner> =
    __private::one_relation("parent", "owner");
assert!(format!("{relation:?}").contains("owner"));
```

## Members

- `id` (attribute)
- `marker` (attribute)
- `is` (method)