> Aztec.nr API reference, v6.0.0 (mainnet and testnet). Index: https://docs.aztec.network/aztec-nr-api/v6.0.0/llms.txt

# Trait NoteProperties

Module: `noir_aztec::note::note_interface`

```rust
pub trait NoteProperties<T> {
    // Required methods
    pub fn properties() -> T;
}
```

Exposes a note's fields as property selectors for filtering.

Each field becomes a [`PropertySelector`](/aztec-nr-api/v6.0.0/noir_aztec/note/note_getter_options/struct.PropertySelector.md) usable with `select`/`sort`.

The implementation generated by the `#[note]` and `#[custom_note]` macros assumes the note packs with the field-by-field layout of `#[derive(Packable)]`. A note with a hand-written `Packable` implementation cannot use it: `properties()` fails to compile when the layouts differ in total length, and a layout that only re-orders fields is not detectable, so its selectors would point at the wrong packed fields. For such notes, define property selectors manually to match the actual layout, e.g. as functions on the note type.

## Required methods

```rust
pub fn properties() -> T
```

## Implementors

```rust
impl NoteProperties<AddressNoteProperties> for AddressNote
```

```rust
impl NoteProperties<EcdsaPublicKeyNoteProperties> for EcdsaPublicKeyNote
```

```rust
impl NoteProperties<FieldNoteProperties> for FieldNote
```

```rust
impl NoteProperties<UintNoteProperties> for UintNote
```