Laravel show data from database and convert to json - php

Question

i'm trying show data from database on laravel, but don't show anything in view blade. Every group hasMany lapangan(eng: court) data
$groups_resource = Groups::all();
$groups = [];
foreach($groups_resource as $group)
{
$g = new Groups();
$g->id_group = "Group_".$group['id_group'];
$g->name = $group['nama'];
$g->expanded = true;
$g->eventHeight = 25;
$g->children = array();
$groups[] = $g;
$lapangan_resource = Lapangan::with('groups')->orderBy('nama')->get();
foreach($lapangan_resource as $lapangan)
{
$l = new Lapangan();
$l->id_lapangan = $lapangan['id_lapangan'];
$l->name = $lapangan['nama_lapangan'];
$g->children[] = $l;
}
}
return json_encode($groups);
output
[{"id_group":"Group_1","name":"Lapangan Badminton","expanded":true,"eventHeight":25,"children":[]},{"id_group":"Group_2","name":"Lapangan Tenis","expanded":true,"eventHeight":25,"children":[]}]
There is no children output for every id_group
.what i want
{"id":"group_1","name":"Indoor","expanded":true,"eventHeight":25,"children":[
{"id":"1","name":"Court 1"},
{"id":"2","name":"Court 2"},
{"id":"3","name":"Court 3"},
{"id":"4","name":"Court 4"}]},
{"id":"group_2","name":"Outdoor","expanded":true,"eventHeight":25,"children":[
{"id":"11","name":"Court 5"},
{"id":"12","name":"Court 6"},
{"id":"13","name":"Court 7"},
{"id":"14","name":"Court 8"}]}
]
Any idea?

Answer 1

If you want to return a response in JSON format than you can use json() method as:
return response()->json($datagrup);
OR
To convert a model to JSON, you should use the toJson method. Like toArray, the toJson method is recursive, so all attributes and relations will be converted to JSON:
$user = App\User::find(1);
return $user->toJson();

Answer 2

Even though, you code seems to really fixed... I still feel the below code should work for you :)
I am not sure what exactly you mean by $datagroup[] = $dataresource? Do you want to add datagroup to dataresource or dataresource to datagroup... Your code shows something and the output desired is something else.
$datagroup = array_map(function($groups) use ($scheduler_resources) {
return [
'id' => $group['id_group'],
'name' => $group['nama'],
'expanded' => true,
'children' => $scheduler_resources->map(function($resource) {
return [
'id' => $resource->id_lapangan,
'name' => $resource->nama_lapangan,
];
}),
'eventHeight' => 25
];
}, $scheduler_groups);
echo json_encode($datagroup);
// or
// return response()->json($datagroup);
Note :- Please ensure $scheduler_resources is different for each $datagroup