# AbstractModel

**Kind:** Class

Abstract superclass for all models. You won't use this class directly.

## Properties

### `id`

Type: `string`

The ID for this model.

### `isDeleted`

Type: `boolean`

`true` if the model has been deleted, and `false` otherwise.

In general, it's best to avoid keeping a reference to an object past the
current event loop, since it may be deleted and trying to access any data
of a deleted object (other than its ID) will throw. But if you keep a
reference, you can use `isDeleted` to check that it's safe to access the
model's data.

## Methods

### `toString()`

A string representation of the model for use in debugging.

**Returns:** `string`

### `unwatch(keys, callback, context?)`

Unwatch keys watched with `.watch`.

Should be called with the same arguments given to `.watch`.

Returns the array of keys that were unwatched.

**Parameters:**
- `keys` (`WatchableKey | ReadonlyArray<WatchableKey>`) — the keys to unwatch
- `callback` (`object`) — the function passed to `.watch` for these keys
- `context?` (`FlowAnyObject | null`) — the context that was passed to `.watch` for this `callback`

**Returns:** `Array<WatchableKey>`

### `watch(keys, callback, context?)`

Get notified of changes to the model.

Every call to `.watch` should have a matching call to `.unwatch`.

Returns the array of keys that were watched.

**Parameters:**
- `keys` (`WatchableKey | ReadonlyArray<WatchableKey>`) — the keys to watch
- `callback` (`object`) — a function to call when those keys change
- `context?` (`FlowAnyObject | null`) — an optional context for `this` in `callback`.

**Returns:** `Array<WatchableKey>`