laravel nested hasmany with where clause on last child - laravel

Question

I want to get data from nested relationships with where clause on the last child, (as json nested response). I'm making an API with 4 nested models with hasmany relations like this:
modelA ->hasmany modelB ->hasmany modelC ->hasmany modelD
(modelA is first parent etc..)
I have a route on api.php
Route::get('/rdata/{string}', [ModelAController::class, 'getdata']);
On my ModelAController:
public function getdata($string)
{
return ModelA::thedata($string);
}
And then on my ModelA
public static function thedata($string)
{
return ...
}
I want to get data based on a field of the 4th ModelD. How can I do a where clause on the 4th child maybe something like this:
where('column', 'like', '%'.$string.'%')
I also tried with collection resources, I can get all the data nested fine but I cant perform the query I want on the last child. Best thing I've achieved is doing the query on the last child load parents but it doesnt work properly
return ModelD::where('column', 'like', '%'.$string.'%')->with('modelc.modelb.modela')->get();
or even with load
return ModelD::where('column', 'like', '%'.$string.'%')->get()->load('modelc.modelb.modela');
then on ModelC:
public function modelb()
{
return $this->belongsTo(ModelB::class, 'f_key','f_key');
}
and the same for the other parents but this is wrong as I get all the children inside them again and also the json is inversed. I want to keep the format:
$response = ['ModelA' => [
'id' => '..'
'field1' => '..'
'ModelB'=>[
etc..
]]
Or is there another way to do it that I don't see? In a way I need something like this but formated in nested json
return DB::table('modela')
->join('modelb', 'modela.id', 'modelb.modela_id')
->join('modelc', 'modelb.id', 'modelc.modelb_id')
->join('modeld', 'modelc.id', 'modeld.modeld_id')
->where('column', 'like', '%'.$string.'%')
->get();
Edit1: I got this so far based on the answer and I want to get parent columns on last child
return self::with('modelb.modelc.modeld')-> whereHas('modelb.modelc.modeld', function ($modeld) use ($string) {
$modeld->where('column', 'like', "%$string%");
->whereColumn('modelc.column2', 'modeld.column2')
->whereColumn('modelc.column3', 'modeld.column3');
})
->with(['modelb.modelc.modeld' => function ($modeld) use ($string) {
$modeld->where('column', 'like', "%$string%");
->whereColumn('modelc.column2', 'modeld.column2')
->whereColumn('modelc.column3', 'modeld.column3');
}])
->get();

Answer 1

I think you can do that with whereHas/with Closures.
ModelA::query()
->whereHas('modelb.modelc.modeld', function ($modeld) use ($string) {
$modeld->where('column', 'like', "%$string%");
->with(['modelb.modelc.modeld' => function ($modeld) use ($string) {
$modeld->where('column', 'like', "%$string%");
}])
->get();
Something like this, but probably more refined in the conditions.
I think based on your edit, that this query should work for your needs.
ModelA::query()
->whereHas('modelb.modelc', function ($modelC) use ($string) {
$modelC->whereHas('modeld', function ($modelD) use ($string) {
$modelD->whereColumn('table_c.column2', 'table_d.column2')
->whereColumn('table_c.column3', 'table_d.column3')
->where('table_d.column', 'like', "%$string%");
});
->with(['modelb.modelc' => function ($modelC) use ($string) {
$modelC->with(['modeld' => function ($modelD) use ($string) {
$modelD->whereColumn('table_c.column2', 'table_d.column2')
->whereColumn('table_c.column3', 'table_d.column3')
->where('table_d.column', 'like', "%$string%");
}]);
}])
->get();