Add support for embedded resources in ra-data-simple-rest

[fzaninotto]

Problem

The embed query meta is a way to tell API backends to embed related resources.

We use it in demos with a FakeRest backend. FakeRest does support embed. However, some of our demos use ra-data-simple-rest, and a fetch mock library (e.g., msw) to hook the simple REST API calls to FakeRest.

Since ra-data-simple-rest doesn't support embed, the embed parameter never reaches FakeRest in this setup, and so the embedded resources are never returned.

Solution

Pass the embed query meta as query param when specified.

dataProvider.getList('posts', {
    filter: {},
    pagination: { page: 1, perPage: 10 },
    sort: { field: 'title', order: 'DESC' },
    meta: { embed: ['author'] },
})
// http://localhost:3000/posts?embed=%5B%22author%22%5D&filter=%7B%7D&range=%5B0%2C9%5D&sort=%5B%22title%22%2C%22DESC%22%5D