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Invalidate

Describes entities to be marked as INVALID. This removes items from a collection, or forces suspense for endpoints where the entity is required.

Constructor​

new Invalidate(entity)
new Invalidate(union)
new Invalidate(entityMap, schemaAttribute)
  • entity: A singular Entity to invalidate.
  • union: A Union schema for polymorphic invalidation.
  • entityMap: A mapping of schema keys to Entities.
  • schemaAttribute: optional (required if entityMap is used) The attribute on each entity found that defines what schema, per the entityMap, to use when normalizing. Can be a string or a function. If given a function, accepts the following arguments:
    • value: The input value of the entity.
    • parent: The parent object of the input array.
    • key: The key at which the input array appears on the parent object.

Usage​

Fixtures
GET /users
[{"id":"123","name":"Jim"},{"id":"456","name":"Jane"},{"id":"555","name":"Phone"}]
DELETE /users/:id
▶api/User
import { Entity, RestEndpoint, Collection, Invalidate } from '@data-client/rest';

class User extends Entity {
  id = '';
  name = '';
}
export const getUsers = new RestEndpoint({
  path: '/users',
  schema: new Collection([User]),
});
export const deleteUser = new RestEndpoint({
  path: '/users/:id',
  method: 'DELETE',
  schema: new Invalidate(User),
});
▶UserPage
import { useSuspense, useController } from '@data-client/react';
import { getUsers, deleteUser } from './api/User';

function UsersPage() {
  const users = useSuspense(getUsers);
  const ctrl = useController();
  return (
    <div>
      {users.map(user => (
        <div key={user.pk()}>
          {user.name}{' '}
          <span
            style={{ cursor: 'pointer' }}
            onClick={() => ctrl.fetch(deleteUser, { id: user.id })}
          >
            ❌
          </span>
        </div>
      ))}
    </div>
  );
}
render(<UsersPage />);
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Batch Invalidation​

Here we add another endpoint for deleting many entities at a time by wrapping Invalidate in an array. Data Client can then invalidate every entity from the response.

import { resource, Invalidate } from '@data-client/rest';
import Post from './Post';

export const PostResource = resource({
  schema: Post,
  path: '/posts/:id',
}).extend('deleteMany', {
  path: '/posts',
  body: [] as string[],
  method: 'DELETE',
  schema: [new Invalidate(Post)],
});
▶Request
import { PostResource } from './Resource';
PostResource.deleteMany(['5', '13', '7']);
Request
DELETE /posts
Content-Type: application/json
Body: ["5","13","7"]
Response200
[
  {
    "id": "5"
  },
  {
    "id": "13"
  },
  {
    "id": "7"
  }
]

Sometimes our backend returns nothing for 'DELETE'. In this case, we can use process to build a usable response from the argument body.

import { resource, Invalidate } from '@data-client/rest';
import Post from './Post';

export const PostResource = resource({
  schema: Post,
  path: '/posts/:id',
}).extend('deleteMany', {
  path: '/posts',
  body: [] as string[],
  method: 'DELETE',
  schema: [new Invalidate(Post)],
  process(value, body) {
    // use the body payload to inform which entities to delete
    return body.map(id => ({ id }));
  }
});
▶Request
import { PostResource } from './Resource';
PostResource.deleteMany(['5', '13', '7']);
Request
DELETE /posts
Content-Type: application/json
Body: ["5","13","7"]
Response204
NO CONTENT

Polymorphic types​

If your endpoint can delete more than one type of entity, you can use polymorphic invalidation.

With Union schema​

The simplest approach is to pass an existing Union schema directly:

import { Entity, RestEndpoint, Union, Invalidate } from '@data-client/rest';

class User extends Entity {
  id = '';
  name = '';
  readonly type = 'users';
}
class Group extends Entity {
  id = '';
  groupname = '';
  readonly type = 'groups';
}

const MemberUnion = new Union(
  { users: User, groups: Group },
  'type'
);

const deleteMember = new RestEndpoint({
  path: '/members/:id',
  method: 'DELETE',
  schema: new Invalidate(MemberUnion),
});

string schemaAttribute​

Alternatively, define the polymorphic mapping inline with a string attribute:

import { RestEndpoint, Invalidate } from '@data-client/rest';

const deleteMember = new RestEndpoint({
  path: '/members/:id',
  method: 'DELETE',
  schema: new Invalidate(
    { users: User, groups: Group },
    'type'
  ),
});

function schemaAttribute​

The return values should match a key in the entity map. This is useful for more complex discrimination logic:

import { RestEndpoint, Invalidate } from '@data-client/rest';

const deleteMember = new RestEndpoint({
  path: '/members/:id',
  method: 'DELETE',
  schema: new Invalidate(
    { users: User, groups: Group },
    (input, parent, key) => input.memberType === 'user' ? 'users' : 'groups'
  ),
});

Impact on useSuspense()​

When entities are invalidated in a result currently being presented in React, useSuspense() will consider them invalid

  • For optional Entities, they are simply removed
  • For required Entities, this invalidates the entire response re-triggering suspense.