This is the 15th day of my participation in the November Gwen Challenge. Check out the event details: The last Gwen Challenge 2021

Shopping cart management API

1.1 Create shopping cart model and migrate files

Run the commandphp artisan make:model Cart -m Create shopping cart model and migrate files:Create table field:

        Schema::create('carts'.function (Blueprint $table) {
            $table->id();
            $table->integer('user_id')->comment('users');
            $table->integer('goods_id')->comment('goods');
            $table->integer('num')->default(1)->comment('Quantity of goods');
            $table->integer('is_checked')->default(1)->comment('Select or not: 0=> No, 1=> Select');
            $table->timestamps();
        });
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Run the migration command:php artisan migrate The shopping cart model sets the fields that the shopping cart allows for batch assignment:

    // Fields that allow batch assignment
    protected $fillable = ['user_id'.'goods_id'.'num'];
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1.2 Creating a Shopping cart resource controller

Run the commandphp artisan make:controller Web/CartController --api:

1, write add method to shopping cart

    /** * join shopping */
    public function store(Request $request)
    {
        $request->validate([
            'goods_id'= >'required|exists:goods,id'.'num'= > [// The quantity must not exceed the inventory of the goods
                function ($attribute.$value.$fail) use ($request) {
                    $goods = Good::find($request->goods_id);
                    if ($value > $goods->stock) {
                        $fail("Quantity cannot exceed merchandise stock!"); }}]], ['goods_id.required'= >'Goods cannot be empty'.'goods_id.exists'= >'Goods do not exist'
        ]);
		// Check whether the shopping cart data exists
        $cart = Cart::where('user_id', auth('api') -> id())
                ->where('goods_id'.$request->input('goods_id'))
                ->first();

        if (!empty($cart)) {
            $cart->num = $cart->num + $request->input('num'.1);
            $cart->save();
            return $this->response->noContent();
        }
        Cart::create([
            'user_id' => auth('api')->id(),
            'goods_id'= >$request->input('goods_id'),
            'num'= >$request->input('num'.1)]);return $this->response->created();
    }
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2. Methods of quantity increase and reduction

Add model associated items to the shopping cart model:

    /** ** ** */
    public function goods() {
        return $this->belongsTo(Good::class, 'goods_id'.'id');
    }
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    /** * Update number */
    public function update(Request $request, Cart $cart)
    {
        $request->validate([
            'num'= > ['required'.'gte:1'.// Must be greater than or equal to 1
                function ($attribute.$value.$fail) use ($cart) {
                    if ($value > $cart->goods->stock) { // Use the association model to fetch the commodity model
                        $fail('Quantity cannot exceed maximum stock! '); }},// Can not exceed the inventory]], ['num.required'= >'Quantity cannot be empty'.'num.gte'= >'Quantity at least greater than 1',]);$cart->num = $request->input('num');
        $cart->save();

        return $this->response->noContent();
    }
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3. Remove the shopping cart

    /** * remove the shopping cart */
    public function destroy(Cart $cart)
    {
        $cart->delete();
        return $this->response->noContent();
    }
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Shopping cart list

The cart list is the data that requires additional items, so we create cart CartTransformer. PHP:


       

namespace App\Transformers;

use App\Models\Cart;
use League\Fractal\TransformerAbstract;

class CartTransformer extends TransformerAbstract {
    // Additional imported data
    protected $availableIncludes = ['goods'];

    public function transform(Cart $cart) {
        return [
            'id'= >$cart->id,
            'user_id'= >$cart->user_id,
            'goods_id'= >$cart->goods_id,
            'num'= >$cart->num,
            'is_checked'= >$cart->is_checked,
        ];
    }

    /** * Additional commodity data */
    public function includeGoods (Cart $cart) {
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Shopping cart list method:

    /** * Shopping cart list */
    public function index()
    {
        $carts = Cart::where('user_id', auth('api')->id())->get(); // The current user's shopping cart list
        return $this->response->collection($carts.new CartTransformer());
    }
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1.3 Creating a shopping cart resource route

        /** * shopping cart */
        $api->resource('carts', CartController::class, [
            'except'= > ['show'] // Exclude shopping cart details not required
        ]);
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1.4 Test Effect

1. Test adding to shopping cart:

2. Test the number of updates You can see that the update succeeded.

Delete the shopping cart

Shopping cart listYou can see that additional information about the item has been read.

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