Laravel return data based on relation result - php

Question

PostController.php
$customers = $query->orderBy('id', 'desc')->with('agents:agents.id')->get();
foreach ($customers as $customer) {
$customer->calculator = $this->calculator($customer);
}
return response()->json($customers, 200 );
Post.php
function agents()
{
return $this->belongsToMany('App\Agent','files','post_id','agent_id');
}
This return right data, like this:
[{
"id": 5,
"hash": "SqB29tkfm1dwGsXp4ZCV",
"agents": [{
"id": 1,
"pivot": {
"post_id": 5,
"agent_id": 1
}
}]
},
{
"id": 4,
"hash": "SqH29tkfm1dwGsXp4ZCV",
"agents": []
},
{
"id": 3,
"hash": "RqH29tkfm1dwGsXp4ZCV",
"agents": [{
"id": 1,
"pivot": {
"post_id": 3,
"agent_id": 1
}
}]
},
{
"id": 1,
"hash": "RqH29tkfm1dwGrXp4ZCV",
"agents": [{
"id": 1,
"pivot": {
"post_id": 1,
"agent_id": 1
}
}]
}
]
But what I want is return just those data that has empty agents [] , in this case, should return just id 4 because agents array is empty. how can I do this?

Answer 1

Try this :
$customers = $query->orderBy('id', 'desc')->whereDoesntHave('agents')->get();
If you want to get the customer who doesn't have agents.
Read more at here

Answer 2

you can use both doesntHave or whereDoesntHave like
$customers = $query->orderBy('id', 'desc')->doesntHave('agents')->get();
or
$customers = $query->orderBy('id', 'desc')->whereDoesntHave('agents')->get();