Laravel Filterable

Simple filter and paginate index data. Main idea - KISS.

Example query:

?search_description=some%20text&sort_id=desc&where_publisher_id=1,23&where_has_groups__id=30,40&limit=10&offset=20

In code this query reflects:

• search_description=some%20text - $builder->where('description', 'like', '%some%text%')
• sort_id=desc - $builder->sortBy('id', 'desc')
• where_publisher_id=1,23 - $builder->whereIn('publisher_id', [1,23])
• where_has_groups__id=30,40 - $builder->whereHas('groups', fn($builder) => $builder->whereIn('id', [30,40]))
• limit=10 - $builder->limit(10)
• offset=20 - $builder->offset(20)

Installation

Requires laravel >= 9 and php ^8.1

composer require freebuu/laravel-filterable

Basic usage (pagination only)

Add HasRequestFilter trait to Model - that's all.

class PostIndexController
{
    public function __invoke(Request $request) 
    {
        $data = Post::requestFilter()->setResource(PostResource::class);
        return response()->json($data);
    }
}

Example result for query /api/posts/?limit=25&offset=10

{
    "meta": { // object with pagination data
        "limit": 25,
        "offset": 10,
        "total": 2
    },
    "data": [ //array with model data, wrapped in `PostResource` (of course you can not use resource and simply output collection or pass collection to view)
        {
            "id": "1",
            "title": "post title"
        },
        {
            "id": "2",
            "title": "another post title"
        }
    ]
}

Filtration

For filtration, you need to create filter class for each model. Filter class must extend AbstractFilter. Best place for these classes is App\Http\Filters.

In method getFilterableFields() you specify which fields can be filtered in each filter case.

HINT - always add default state because filter cases may be supplemented.

class PostFilter extends AbstractFilter
{
    protected function getFilterableFields(FilterCaseEnum $case): array
    {
        return match ($case) {
            FilterCaseEnum::WHERE => ['publisher_id'],
            FilterCaseEnum::SORT => ['id'],
            FilterCaseEnum::WHERE_HAS => ['groups' => ['id']]
            default => []
        };
    }
}

To set this filter for Model - overwrite requestFilterClass() method

class Post extends Model
{
    use HasRequestFilter;
    
    public function requestFilterClass(): string
    {
        return \App\Http\Filters\PostFilter::class;
    }
}

Filter case

Filterable query params contains four parts separated with _. Let's see example with where_has_groups__id=30,40

• $case - where_has
• $field - groups
• $fieldValue - id (optional, mandatory only with where_has)
• $value - 30,40

In code, they are presented as FilterCaseEnum.php and they work like this

• FROM
  • Accepts only int
  • $builder->where($field, '>=', $value)
• TO
  • Accepts only int
  • $builder->where($field, '<=', $value)-
• SORT - sorting
  • Accepts only asc, desc
  • $builder->sortBy($field, $value)
• SEARCH - search with like operator
  • Accept string with spaces. Add % at start, end and instead of all spaces
  • $builder->where($field', 'like', $value)
• START_WITH - all strings starts with passed value
  • Accept string without spaces. Add % at end of value
  • $builder->where($field', 'like', $value)
• WHERE_HAS - filter by relation with array of values
  • Accept comma separated array of values.
  • For this filter fieldValue fields must be set (see in example in PostFilter)
  • $builder->whereHas($field, fn($builder) => $builder->whereIn($fieldValue, $value))
• WHERE - filter by array of values
  • Accept comma separated array of values.
  • $builder->whereIn($fieldValue, $value)
• FILTER - uses for custom filters, see below

Custom filters

In filter class you can make custom filter by creating a method like filterCustom - it must begin with filter. Then yoy can use it in query like ?filter_custom=123

HINT - you can use fieldValue here like ?filter_custom__alias=123 - it pass as third parameter in filter method.

class PostFilter extends AbstractFilter
{
    public function filterCustom(Builder $builder, mixed $value, mixed $fieldValue): void
    {
        //you have request instance here
        if($this->request->query('something')){
            return;
        }
        //$value will be 123 
        //$fieldValue will be alias (or can be null)
        $builder->where('some_field', $value)->where($fieldValue, '432')
    }
}

Advanced usage

Limit

For security reasons, the limit field is set to a maximum value. If the request specifies a value greater, it will be reset to the default value.

• Default it set to 30
• You can override this value in Filter class - overwrite the maxLimit property.
• Or you can override it system-wide in AppServiceProvider

class AppServiceProvider extends ServiceProvider
{
    public function register() 
    {
        AbstractFilter::$defaultMaxLimit = 50;
    }
}

Resource

To set up resource - just pass resource class like here Post::requestFilter()->response(PostResource::class).

Query callbacks

Sometimes you need to set up query condition situational - e.g. filter only for auth user

Post::requestFilter()
    ->addQueryCallback(fn (Builder $builder) => $builder->where('author_id', auth()->id()))
    ->response(ResourceClass::class);