Filter laravel collection in sub collection - php

Question

My collection is like this.
Collection {
0 => Name_Model {
"id" => 44
"name" => "The name of "
"list_angg" => Collection {
0 => Name_Model_sub {
"code" => "02"
"nameofcode" => "The name of 02"
}
1 => Name_Model_sub {
"code" => "01"
"nameofcode" => "The name of 01"
}
}
}
1 => Name_Model {
"id" => 45
"name" => "The name of thus"
"list_angg" => Collection {
0 => Name_Model_sub {
"code" => "03"
"nameofcode" => "The name of 3"
}
}
}
}
I want to filter that model by value of list_angg->code. So I try like this. Filter and foreach that list_angg->code
$jurnals = $filterCollection->filter(function($value, $key) use ($kode_fakultas){
foreach ($value->list_angg as $lists) {
$filtered = $lists->where('code', $kode_fakultas);
return $filtered;
}
return $filtered;
});
dd($jurnals);
I try use method reject() and map().
But filter didn't work as well. Is I miss something?

Answer 1

Hope I understood the question correctly.
To filter all elements which list_angg->code has the given value you can use a combination of filter() and contains().
$filterCollection->filter(function ($value) use ($code) {
return $value->list_angg->contains('code', $code);
});
filter() returns all values in a collection which return a truthy value.
contains() returns true or false if a collection contains a value matching the condition provided, which can be a closure, a value or a key and value.
Keep in mind contains() uses "loose" comparison, so if you need a strict match you can use containsStrict.
Your code is not filtering correctly because in the filter closure you are always returning the model instance, which evaluates to true or false based on the first element and therefore it is considered as a pass or fail based on that.
References:
https://laravel.com/docs/8.x/collections#method-contains
https://laravel.com/docs/8.x/collections#method-filter
https://laravel.com/docs/8.x/collections#method-containsstrict

Answer 2

you can do this by first restructuring the collection according to your requirements. For example:
public function formatCollection($collection)
{
$results = [];
foreach ($collection as $item)
{
$results[] = [
'foe' => $item['bar'],
'baz' => $item['foo']
];
}
return collect($results);
}
This will return the required json format and after that you can apply your filters to it. For Example:
$result = formatCollection($collection);
This will return the collection on which you can apply
$result->filter(function(value){
return (value === 'foo');
}
This will return the required information or models you require in your collection.