Skapa en filtrerbar lista med hjälp av Laravel- och Eloquent-frågor

När du börjar tillämpa villkor på dina frågor måste du notera följande funktion:newQuery() . Med den här funktionen kan du starta en ny frågebyggare och koppla dina filter/orderbytes till den.

Exempelschema:

Kolumner i Produkt tabell:

id | name | price | date_received

Kolumner i product_tag tabell:

id | tag_id | product_id

Kolumn i tagg tabell:

id | name

Relation:

• Många produkter har många taggar

Jag kommer inte att ställa in de vältaliga modellerna, men observera att produktmodellen har en tag() funktion med en hasManyThrough() förhållande

En filterklass har ställts in med huvudsyftet att tillämpa dina filter och beställa bys. Obs:Klassen kan abstraheras ytterligare.

Din filterklass:

class ProductFilter {

    /**
    * Fluent query builder
    * @var mixed $queryBuilder
    */
    private $queryBuilder;

    /**
    * Http Request
    * @var \Illuminate\Http\Request $request
    */
    protected $request;

    /**
    * Filters collection
    * @var array $filters
    */
    private $filters = [];

    /**
    * Order Bys Collection
    * @var array $orderBys
    */
    private $orderBys = [];

    /**
    * Class constructor
    *
    * @param array $input
    */
    public function __construct(\Illuminate\Http\Request $request, &$queryBuilder)
    {
        //Initialize Query Builder
        $this->queryBuilder = $queryBuilder;
        //Get input
        $this->request = $request;

        //Register Filters
        $this->registerFilters();

        //Register Order Bys
        $this->registerOrderBys();
    }

    /**
     * Register Filters in the function below
     * Each filter is in the form of an array
     */

    private function registerFilters()
    {
        $this->filters['product_name'] = ['name'=>'Name',
                                                'value' => $this->request->get('filter_product_name'),
                                                'enabled' => $this->request->has('filter_product_name'),
                                                'function' => 'filterProductName'
                                            ];

        $this->filters['tag'] = ['name'=>'End Date',
                                            'value' => $this->request->get('filter_tag'),
                                            'enabled' => $this->request->has('filter_tag'),
                                            'function' => 'filterTag'
                                        ];
    }

    /**
    * Check if any filters are active
    * Useful to show/hide filter bar
    * 
    * @return bool
    */
    public function isFiltersActive()
    {
        return (boolean)count(
            array_filter($this->filters,function($v){
                return $v['enabled'] === true;
            })
        );        
    }

    /**
    * Register Order Bys in the function below
    * Each order by is in the form of an array
    *
    */
    private function registerOrderBys()
    {
        $this->orderBys['name'] = [
                                    'name' => 'Order By Name',
                                    'value' => $this->request->get('order_by_product_name','ASC'),
                                    'enabled' => $this->request->has('order_by_product_name'),
                                    'function' => 'orderByProductName'
                                  ];
    }

    /**
    * Check if any order bys are active
    * Useful to show/hide order by bar
    * 
    * @return bool
    */
    public function isOrderBysActive()
    {
        return (boolean)count(
            array_filter($this->orderBys,function($v){
                return $v['enabled'] === true;
            })
        );        
    }    

    /**
     * Apply Filters
     * Loop through each filter, check if they are enabled. If they are, apply filter to query builder
     */

    public function applyFilters()
    {
        foreach($this->filters as $filter_name => $filter_array)
        {
            if($filter_array['enabled'] &&
                array_key_exists('function',$filter_array) &&
                method_exists($this,$filter_array['function']))
            {
                $this->{$filter_array['function']}($filter_array);
            }
        }

        return $this;
    }

    /**
     * Apply Order Bys
     * Loop through each order by, check if they are enabled. If they are, apply order by to query builder
     */

    public function applyFilters()
    {
        foreach($this->orderBys as $order_by_name => $order_by_array)
        {
            if($order_by_array['enabled'] &&
                array_key_exists('function',$order_by_array) &&
                method_exists($this,$order_by_array['function']))
            {
                $this->{$order_by_array['function']}($order_by_array);
            }
        }

        return $this;
    }    

    /*
     * Filter Functions: START
     */

    /**
    * Filter by Product Name
    *
    * @param array $filterArray
    */
    private function filterProductName($filterArray)
    {
        $this->queryBuilder
            ->where('name','=',$filterArray['value']);
    }

    /**
    * Filter by Product Tag
    *
    * @param array $filterArray
    */
    private function filterTag($filterArray)
    {
        $this->queryBuilder
        ->whereHas('tag',function($query) use ($filterArray){
            return $query->where('name','=',$filterArray['value']);
        }); 
    }

    /*
     * Filter Functions: END
     */


    /*
    * Order By Functions: START
    */

    /**
    * Order By Name
    * @param array $orderByArray
    */
    private function orderByName($orderByArray)
    {
        $this->queryBuilder
        ->orderBy('name', $orderByArray['value']);
    }

    /*
    * Order By Functions: END
    */    
}

Så här använder du:

//In my controller function

public function getListOfProducts(\Illuminate\Http\Request $request)
{
    //Init Product Query
    $productQuery = \App\Models\Product()::newQuery();

    //Apply all filters and order bys
    $productFilter = app('ProductFilter',[$request,$productQuery])->applyFilters()->applyOrderBys();

    //Fetch Product Result
    $productResult = $productQuery->get();
}