Laravel - 函数where（）之后已经检索到模型

Can I use the function where() or some equivalent after the model has already been retrieved? For example:

    $head = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)
                      ->whereHas('item', function ($q) {
                          $q->where('type_id', 1);
                      })->where('wear', 1)->first();

    $torso = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 2);
    })->where('wear', 1)->first();

    if ($torso == null)
        $torso = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
            $q->where('type_id', 3);
        })->where('wear', 1)->first();

    $hands = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 4);
    })->where('wear', 1)->first();

    $waist = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 5);
    })->where('wear', 1)->first();

    $feet = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 6);
    })->where('wear', 1)->first();

    $amulet = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 8);
    })->where('wear', 1)->first();

    $first_ring = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 9);
    })->where('wear', 1)->first();

    $secound_ring = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->where('type_id', 9);
    })->where('wear', 2)->first();

    $right_hand = Equipment::where('user_id', $fighter->id)->where('lvl_after_reduction', '<=', $fighter->attributes->lvl)->where('durability', '>', 0)->whereHas('item', function ($q) {
        $q->whereIn('type_id', [10, 11]);
    })->where('wear', 1)->first();

Can I combine these queries into one? Because I have a lot of queries to database per page.

Sorry for my english.

Please combine your where clause in one function like this

$torso = Equipment::where([['user_id', $fighter->id], ['wear', 1]])->first();

It is much cleaner.

Yes it is possible to use where function after running a query as long as it returns collection.

eg You can do

Equipment::all();

Then apply where clause to the collection it returns. Query like this return an eloquent collection. Go to this documentation page https://laravel.com/docs/5.5/eloquent-collections to see all the functions available for eloquent collection.

However using where clause to return value of query that end with first() is not possible as it does not return a collection.