php - How to query Products according to the size? -

so have model product must filtered color, price, , size. here relationships.

class product extends model {     public function color()     {         return $this->belongsto('app\color');     }      public function sizes()     {         return $this->belongstomany('app\size', 'product_size')->withtimestamps();     } } 

here size model:

class size extends model {     public function products()     {         return $this->belongstomany('app\product', 'product_size')->withtimestamps();     } } 

here form:

<form id="filteroptions" method="get" action="{{ url::current() }}">     <button type="submit" class="btn-color">filter</button>      <div class="clearfix space20"></div>     <h5>color</h5>     <ul class="color-list">         @foreach($availablecolors $color)             <li><input type="checkbox" name="color[]" value="{{ $color->id }}"><a href="#"><span class="{{ $color->name }}"></span> {{$color->name_bg}}</a></li>             {{ $color->name }}         @endforeach     </ul>     <div class="clearfix space20"></div>      <h5>price</h5>     <div id="slider-container"></div>     <p>         <span class="{{--pull-right--}} sc-range">             <input class="pull-left" name="min" type="text" id="min" style="border: 0; color: #333333; font-weight: bold;"/>             <input class="pull-right" name="max" type="text" id="max" style="border: 0; color: #333333; font-weight: bold;"/>         </span>     </p>      <div class="clearfix space30"></div>     <h5>size</h5>     <ul class="size-list">         @foreach($availablesizes $size)             <li><input type="checkbox" name="size[]" value="{{ $size->id }}">{{ $size->size }}</li>         @endforeach     </ul> </form> 

i manage query products price , color without problems. can't query when many many relationship. how can that? here code far:

$minprice = $request['min']; $maxprice = $request['max']; $colors = $request['color']; $sizes = $request['size'];  if (count($request->all()) != 0) {     $query = product::with(['sizes' => function($query) use($request) {         $sizearray = $request->get('size');         $query->wherein('size', $sizearray);     }]);      if(isset($minprice) && isset($maxprice)) {         $query->wherebetween('price', array($minprice, $maxprice));     }      if(isset($colors)) {         $query->wherein('color_id', $colors);     }      $products = $query->get(); } 

everything works besides query sizes. how can fix this? please, can't find solution this.