# io.github.libtmux.query.FilterExpr.ToOne.relation

- **Module:** io.github.libtmux.query
- **Package:** io.github.libtmux:libtmux
- **Language:** Java
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-java/blob/c067fced0dfd19bd6dd3d260e9d4c336becdb063/libtmux/src/main/java/io/github/libtmux/query/FilterExpr.java
- **Page:** https://libtmux.org/en/java/latest/reference/io-github-libtmux-query-filterexpr-filterexpr-toone-relation/

```
io.github.libtmux.query.FilterExpr.ToOne.relation() -> Fields.ToOneRef<T, R>
```

## Type parameters

- [`T`](/en/java/latest/reference/io-github-libtmux-query-filterexpr-filterexpr-toone/#io.github.libtmux.query.FilterExpr.FilterExpr.ToOne.type-parameter.T), declared by [`ToOne<T, R>`](/en/java/latest/reference/io-github-libtmux-query-filterexpr-filterexpr-toone/)
- [`R`](/en/java/latest/reference/io-github-libtmux-query-filterexpr-filterexpr-toone/#io.github.libtmux.query.FilterExpr.FilterExpr.ToOne.type-parameter.R), declared by [`ToOne<T, R>`](/en/java/latest/reference/io-github-libtmux-query-filterexpr-filterexpr-toone/)