Apply Laravel Nova filter to Computed Value

Question

I have a Laravel Nova resource, and it has a computed value inside it entitled views. I want to add a Nova filter which can affect the result of the computed value (not the query itself), but can't figure out how to do this.

My computed value looks like this:

Text::make('Views', function() {
    return $this->getViewsCount();
}),

I want to be able to do something like:

Text::make('Views', function() {
    if(isset($filterValue)) {
        return $this->getViewsBetween($filterValue);
    } else {
        return $this->getViewsCount();
    }
}

Answer 1

You can try to get the filters value from the request:

$queryFilters = $request->query('filters')

The parameter is base64 and json encoded so you'll have to decode it first. Take a look at Laravel\Nova\Http\Requests\DecodesFilters as reference.

Your computed field could look something like this:

Text::make('Views', function () use ($request) {

    $queryFilters = $request->query('filters');
    $decodedFilters = collect(json_decode(base64_decode($queryFilters), true));
    $computed = $decodedFilters->map(function ($filter) {
        return $this->getViewsBetween($filter['value']);
    });

    if ($computed->isEmpty()) {
        return $this->getViewsCount();
    }

    return $computed->implode(',');
})

Update: $decodedFilters holds the class and the value for the selected filters.

Illuminate\Support\Collection {
  #items: array:1 [
    0 => array:2 [
      "class" => "App\Nova\Filters\UserType"
      "value" => "admin"
    ]
  ]
}