Display and search categories

app/Http/Controllers/CartController.php

@@ -33,13 +33,11 @@ class CartController extends Controller
         $user->cart()->syncWithoutDetaching([$product->uuid]);
         $quantity = $request->validate([
             'quantity' => 'numeric|min:1'
-        ])["quantity"];
+        ])["quantity"] ?? 1;
 
-        if($quantity) {
         $pivot = $user->cart()->findOrFail($product->uuid)->pivot;
         $pivot->quantity = $quantity;
         $pivot->save();
-        }
 
         return back();
     }

app/Http/Controllers/MainPageController.php

@@ -2,6 +2,7 @@
 
 namespace App\Http\Controllers;
 
+use App\Models\Category;
 use App\Models\Product;
 use Illuminate\Http\Request;
 
@@ -9,13 +10,17 @@ class MainPageController extends Controller
 {
     public function index(Request $request)
     {
-        $query = $request->query->get("q");
-        if ($query) {
+        $query = Product::query()->latest()->limit(100);
+        $search = $request->query->get("q");
+        if ($search) {
             // O(n) query at best, malicious users can just insert % and _ characters into the query if they wanna, but it's fine half the class left every single field vulnurable to sqli so I don't wanna bother doing this properly with a full text search
-            $products = Product::query()->where('name', 'like', "%{$query}%")->orWhere('description', 'like', "?")->latest()->limit(100)->get();
-        } else {
-            $products = Product::query()->latest()->limit(100)->get();
+            $query = $query->where('name', 'like', "%{$search}%")->orWhere('description', 'like', "%{$search}%");
         } 
-        return view("index", ["products" => $products, "query" => $query]);
+        $category = $request->query->get("category");
+        if ($category) {
+            // O(n) query at best, malicious users can just insert % and _ characters into the query if they wanna, but it's fine half the class left every single field vulnurable to sqli so I don't wanna bother doing this properly with a full text search
+            $query = $query->whereHas('categories', fn ($b) => $b->where("name","=",$category));
+        } 
+        return view("index", ["products" => $query->get(), "query" => $search]);
     }
 }

resources/views/product/view.blade.php

@@ -18,6 +18,12 @@
                 <h2 class="product-name"> {{ $product->name }} </h2>
                 <h3>{{ ($product->price) }}<span class="price-currency">zł</span></h3>
             </div>
+            <div class="categories">
+                @foreach($product->categories as $category) 
+                    <a href="{{ route("main", ['category' => $category->name]) }}"> {{ $category->name }} </a>
+                @endforeach
+            </div>
+
             <div class="product-commands">
                 @auth
                 @if(!Auth::user()->cart()->find($product))