Missing one step for adding ServiceMixin in documentation

[shazha]

Description / Steps to reproduce / Feature proposal

Create a new LB4 app and try to add a rest service as datasource by following the doc Integrate with a geo-coding service.

Current Behavior

When trying to access the injected rest service, the following exception occurred:
The key services.GeocoderService was not bound to any value.

Expected Behavior

The rest service can be injected properly.

Fix

After applying the following changes to application.ts file, the error is gone. And this should be documented:

From

export class StorageApplication extends BootMixin(
  RepositoryMixin(RestApplication),

to

import {ServiceMixin} from '@loopback/service-proxy';

export class StorageApplication extends BootMixin(
  ServiceMixin(RepositoryMixin(RestApplication)),

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[virkt25]

Great catch! Would you be interested in submitting a PR to fix this?

[shazha]

Sure, I'll submit a PR later.

[virkt25]

PR Landed. Thanks for the contribution @shazha! 💯 🎉