Laravel多条件where查询语句使用详解

$query = Product::newInstance();
if ($request->color) {
    $query->whereColor($request->color);
}
if ($request->size) {
    $query->whereSize($request->size);
}
if ($request->orderBy && $request->sort) {
    $query->orderby($request->orderBy, $request->sort);
}
$products = $query->get();

...其他代码
if ($request->orderBy && $request->sort) {
    $query->orderby($request->orderBy, $request->sort);
} else {
    $query->orderby('price', 'desc');
}
...其他代码

$products = Product::when($request->color, function ($query) use ($request) {
    return $query->whereColor($request->color);
})
->when($request->size, function ($query) use ($request) {
   return $query->whereSize($request->size);
})
->when($request->orderBy && $request->sort, function ($query) use ($request) {
   return $query->orderBy($request->orderBy, $request->sort);
})
->get();

...其他代码
->when($request->orderBy && $request->sort, function ($query) use ($request) {
   return $query->orderBy($request->orderBy, $request->sort);
}, function ($query) {
   return $query->latest('price');
})
...其他代码