Wordpress REST API _fields and _embed parameters are not working simultaneously

Question

If you call the REST API using _embed parameter you will be able to get the embedded objects as "_embedded" JSON object of returned JSON as following:

/?rest_route=/wp/v2/posts&_embed

And if you use _fields parameter you can filter out the objects returned by API like:

/?rest_route=/wp/v2/posts&_fields=id,content,title

The problem is when both are_embed and _filter are used simultaneously the results returned do not contain "_embedded" JSON object no matter what combination of filter I apply. For example:

/?rest_route=/wp/v2/posts&_embed&_fields=id,content,title,_embedded

does not return "_embedded" JSON object

Worpress Version is 5.3.2 (Latest)

And pretty permalinks are not enabled so usage of "/?rest_route=" is mandatory

Answer 1

As answered previously, it would seem the _link is necessary to figure out how to get the _embed property. But if you're like me and want to really minimize the amount of JSON that is returned, you can do the following.

Suppose you want the wp:featuredmedia property of _embedded. Then you can request

OPTION 1

/wp/v2/pages?_embed=wp:featuredmedia&_fields=_links.wp:featuredmedia,_embedded

_embed => wp:featuredmedia

_fields => _embedded and _links.wp:featuredmedia (so that embedding will actually work)

OPTION 2: A slight variation that also works

/wp/v2/pages?_embed&_fields=_links.wp:featuredmedia,_embedded.wp:featuredmedia

_embed => tells us to do embedding

_fields => _links.wp:featuredmedia,_embedded.wp:featuredmedia (ensures we only return those)

Answer 2

You need to add _links to get the JSON object:

/wp-json/wp/v2/posts?_fields=id,content,title,_links,_embedded&_embed