linkHooks

linkBefore Create

The beforeCreate hook runs before a Node is created by the createOne, createMany statics, and the build method.

It runs before the node is validated, therefore it's suitable for mutating data before the validation runs.

1linkUsers.beforeCreate = (

2link    /* --> the Instance that's about to be saved to the database */

3link    user

4link) => {

5link    if (user.age) {

6link        user.age += 2;

7link    }

8link};

9link

10linkconst user = await Users.createOne({

11link    id: '123',

12link    name: 'John',

13link    age: -1

14link});

15link

16linkconsole.log(user.age); // 1

It also runs when creating relating nodes

1linkOrders.beforeSave = (order) => {

2link    if (order.items < 0) {

3link        order.items = 0;

4link    }

5link};

6link

7linkawait Users.createOne({

8link    id: '123',

9link    name: 'John',

10link    Orders: {

11link        properties: [

12link            {

13link                id: '456',

14link                items: -1

15link            }

16link        ]

17link    }

18link});

19link

20link/* --> the created Order node will have items === 0 */

linkBefore Delete

The beforeDelete hook runs before an Instance is deleted with its delete method.

1linkUsers.beforeDelete = (

2link    /* --> the Instance that's about to be deleted */

3link    user

4link) => {

5link    console.log(`I'm ${user.name} and I'm being deleted :(`)

6link}

7link

8linkconst user = Users.build({

9link    id: '123',

10link    name: 'John',

11link});

12link

13linkawait user.save();

14link

15link/* --> before the next command finished, beforeDelete runs and logs to the console */

16linkawait user.delete();