Nested embedded resources - postgrest

Question

I'm new to postgREST. I've set it up and it's working fine with my db. I'm going through the docs and I think I could use of Resource Embedding, but I can't figure out how to make it work in a nested way.
My schema has tables similar to the following:
create table ta (
a_id integer primary key,
a_desc varchar(50)
);
create table tb (
b_id integer primary key,
a_id integer not null,
b_desc varchar(50),
constraint tb_fk1 foreign key (a_id) references ta(a_id)
);
create table tc (
c_id integer primary key,
b_id integer not null,
c_desc varchar(50),
constraint tc_fk1 foreign key (b_id) references tb(b_id)
);
insert into ta values (1, 'a1');
insert into tb values (1, 1, 'b1');
insert into tb values (2, 1, 'b2');
insert into tc values (1, 1, 'c1');
insert into tc values (2, 1, 'c2');
insert into tc values (3, 2, 'c3');
insert into tc values (4, 2, 'c4');
Resource embedding works when I select ta an tb:
localhost:3000/ta?select=*,tb(*)
[
{
"a_id": 1,
"a_desc": "a1",
"tb": [
{
"b_id": 1,
"a_id": 1,
"b_desc": "b1"
},
{
"b_id": 2,
"a_id": 1,
"b_desc": "b2"
}
]
}
]
It also works with tb and tc:
localhost:3000/tb?select=*,tc(*)
[
{
"b_id": 1,
"a_id": 1,
"b_desc": "b1",
"tc": [
{
"c_id": 1,
"b_id": 1,
"c_desc": "c1"
},
{
"c_id": 2,
"b_id": 1,
"c_desc": "c2"
}
]
},
{
"b_id": 2,
"a_id": 1,
"b_desc": "b2",
"tc": [
{
"c_id": 3,
"b_id": 2,
"c_desc": "c3"
},
{
"c_id": 4,
"b_id": 2,
"c_desc": "c4"
}
]
}
]
But I don't know how to make it work from ta through tc, kind of combining both queries.
Does anyone know how I could achieve this? Preferably using a query string, but working with views or stored procedures would be ok too.
Thanks in advance for any help on this.
PS: Using Potstgres 12 and postgREST 7

Answer 1

For nested resource embedding, you can do:
GET localhost:3000/ta?select=*,tb(*,tc(*))