`addWillDelCellCallback`

The addWillDelCellCallback method registers a WillDelCellCallback that will be called before any Cell is deleted from the Store.

addWillDelCellCallback(callback: WillDelCellCallback): Middleware

Type Description

	Type	Description
`callback`	`WillDelCellCallback`	The `WillDelCellCallback` to register.
returns	`Middleware`	A reference to the `Middleware` object, for chaining.

callback

WillDelCellCallback

The WillDelCellCallback to register.

returns

Middleware

A reference to the Middleware object, for chaining.

The callback returns true to allow the deletion or false to prevent it. Multiple callbacks can be registered and they are called sequentially. If any callback returns false, the deletion is prevented.

Example

This example registers a callback that prevents deleting cells from the 'pets' table.

import {createMiddleware, createStore} from 'tinybase';

const store = createStore();
const middleware = createMiddleware(store);

store.setCell('pets', 'fido', 'species', 'dog');

middleware.addWillDelCellCallback((tableId) => tableId !== 'pets');

store.delCell('pets', 'fido', 'species', true);
console.log(store.getCell('pets', 'fido', 'species'));
// -> 'dog'

middleware.destroy();

Since

v8.0.0