In recent years, with the rapid development of mobile Internet, various e-commerce platforms based on group buying have sprung up, among which e-commerce platforms focusing on group buying are becoming more and more popular. The more popular it is with consumers. This article will introduce how to use the Laravel framework to develop an online group-building platform and provide specific code examples.

1. Requirements Analysis

Before starting development, we need to conduct a requirements analysis to clarify which functional modules need to be developed. A complete group-building platform generally needs to include the following modules:

1. User management module

User registration, login, personal information management, etc.

2. Product management module

The administrator can add product information, including product name, price, inventory, etc.

3. Order management module

Users can select products for group purchase, place orders for purchase, and administrators can view and process orders.

4. Group management module

Users can create group activities or participate in existing group activities.

5. Payment module

supports multiple payment methods, and users can choose the payment method that suits them.

2. Environment setup

Before setting up the development environment, you need to install Composer first, and then run the following command in the command line:

composer create-project --prefer-dist laravel/laravel pin-tuan

This command will create a file named Laravel project for "pin-tuan".

Next, we need to configure the database, edit the ".env" file in the project root directory, and fill in the database-related information completely.

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=pin-tuan
DB_USERNAME=root
DB_PASSWORD=root

After completing the above steps, you can start writing program code.

3. Writing program code

1. User management module

(1) User registration

First, we need to add the registration route in the routing file ：

Route::get('/register', 'AuthRegisterController@showRegistrationForm')->name('register');
Route::post('/register', 'AuthRegisterController@register');

Here we use Laravel’s own user authentication system to implement the user registration function. In the controller file, we only need to override the showRegistrationForm() and register() methods. The specific code is as follows:

class RegisterController extends Controller
{
    use RegistersUsers;

    protected $redirectTo = '/dashboard';

    public function __construct()
    {
        $this->middleware('guest');
    }

    public function showRegistrationForm()
    {
        return view('auth.register');
    }

    protected function register(Request $request)
    {
        $this->validator($request->all())->validate();

        event(new Registered($user = $this->create($request->all())));

        $this->guard()->login($user);

        return redirect($this->redirectPath());
    }
}

(2) User login

Add login route in the routing file:

Route::get('/login', 'AuthLoginController@showLoginForm')->name('login');
Route::post('/login', 'AuthLoginController@login');
Route::post('/logout', 'AuthLoginController@logout')->name('logout');

Similarly, we use Laravel’s own user authentication system to Implement user login function. In the controller file, we only need to override the showLoginForm(), login() and logout() methods. The specific code is as follows:

class LoginController extends Controller
{
    use AuthenticatesUsers;

    protected $redirectTo = '/dashboard';

    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }

    public function showLoginForm()
    {
        return view('auth.login');
    }

    protected function authenticated(Request $request, $user)
    {
        if (!$user->is_activated) {
            $this->guard()->logout();

            return redirect('/login')->withError('請先激活您的賬號');
        }
    }

    public function logout(Request $request)
    {
        $this->guard()->logout();

        $request->session()->invalidate();

        return redirect('/login');
    }
}

(3) Personal information management

In the controller file, we only need to write an update() method to handle personal information update requests. The specific code is as follows:

public function update(Request $request)
{
    $user = Auth::user();

    $this->validate($request, [
        'name' => 'required|string|max:255|unique:users,name,' . $user->id,
        'email' => 'required|string|email|max:255|unique:users,email,' . $user->id,
        'password' => 'nullable|string|min:6|confirmed',
    ]);

    $user->name = $request->input('name');
    $user->email = $request->input('email');
    if ($request->has('password')) {
        $user->password = bcrypt($request->input('password'));
    }
    $user->save();

    return redirect()->back()->withSuccess('更新成功');
}

2. Product management module

(1) Product list

First, define the product model in the model file:

class Product extends Model
{
    protected $fillable = ['name', 'price', 'stock', 'description', 'image'];

    public function getAvatarAttribute($value)
    {
        return asset('storage/' . $value);
    }
}

Next, in the controller file, we write an index() method to display the product list. The specific code is as follows:

public function index()
{
    $products = Product::all();

    return view('product.index', compact('products'));
}

In the view file, we only need to traverse all the products and display them. The specific code is as follows:

@foreach ($products as $product)
    <div class="col-md-4">
        <div class="card mb-4 shadow-sm">
            <img  src="{{ $product- alt="How to use Laravel to develop an online group-sharing platform" >image }}" width="100%">
            <div class="card-body">
                <h5 class="card-title">{{ $product->name }}</h5>
                <p class="card-text">{{ $product->description }}</p>
                <div class="d-flex justify-content-between align-items-center">
                    <div class="btn-group">
                        <a href="{{ route('product.show', $product->id) }}" class="btn btn-sm btn-outline-secondary">查看</a>
                    </div>
                    <small class="text-muted">{{ $product->price }}元</small>
                </div>
            </div>
        </div>
    </div>
@endforeach

(2) Product details

In the controller file, we write a show() method to display product details. The specific code is as follows:

public function show($id)
{
    $product = Product::findOrFail($id);

    return view('product.show', compact('product'));
}

In the view file, we only need to display the detailed information of the product. The specific code is as follows:

<div class="row">
    <div class="col-md-6">
        <img  src="{{ $product- alt="How to use Laravel to develop an online group-sharing platform" >image }}" width="100%">
    </div>
    <div class="col-md-6">
        <h2>{{ $product->name }}</h2>
        <p>價(jià)格：{{ $product->price }}元</p>
        <p>庫存：{{ $product->stock }}件</p>
        <form action="{{ route('product.buy', $product->id) }}" method="post">
            @csrf
            <div class="form-group">
                <label for="quantity">數(shù)量</label>
                <input type="number" name="quantity" class="form-control" min="1" max="{{ $product->stock }}" required>
            </div>
            <button type="submit" class="btn btn-primary">立即購買</button>
        </form>
    </div>
</div>

3. Order management module

(1) Order list

In the controller file, we write an index() method to display the order list . The specific code is as follows:

public function index()
{
    $orders = Order::where('user_id', Auth::id())->get();

    return view('order.index', compact('orders'));
}

In the view file, we only need to traverse all the orders and display them. The specific code is as follows:

@foreach ($orders as $order)
    <tr>
        <td>{{ $order->id }}</td>
        <td>{{ $order->product->name }}</td>
        <td>{{ $order->quantity }}</td>
        <td>{{ $order->price }}</td>
        <td>{{ $order->status }}</td>
    </tr>
@endforeach

(2) Place an order to purchase

In the controller file, we write a buy() method to implement the function of placing an order to purchase. The specific code is as follows:

public function buy(Request $request, $id)
{
    $product = Product::findOrFail($id);

    $this->validate($request, [
        'quantity' => 'required|integer|min:1|max:' . $product->stock,
    ]);

    $total_price = $product->price * $request->input('quantity');

    $order = new Order;
    $order->user_id = Auth::id();
    $order->product_id = $product->id;
    $order->quantity = $request->input('quantity');
    $order->price = $total_price;
    $order->status = '待支付';
    $order->save();

    // 跳轉(zhuǎn)到第三方支付頁面
    return redirect()->to('https://example.com/pay/' . $total_price);
}

4. Group management module

(1) Create a group activity

In the controller file, we write a create() method to Implement the function of creating group activities. The specific code is as follows:

public function create(Request $request)
{
    $product = Product::findOrFail($request->input('product_id'));

    $this->validate($request, [
        'group_size' => 'required|integer|min:2|max:' . $product->stock,
        'group_price' => 'required|numeric|min:0',
        'expired_at' => 'required|date|after:now',
    ]);

    $order = new Order;
    $order->user_id = Auth::id();
    $order->product_id = $product->id;
    $order->quantity = $request->input('group_size');
    $order->price = $request->input('group_price') * $request->input('group_size');
    $order->status = '待成團(tuán)';
    $order->save();

    $group = new Group;
    $group->order_id = $order->id;
    $group->size = $request->input('group_size');
    $group->price = $request->input('group_price');
    $group->expired_at = $request->input('expired_at');
    $group->save();

    return redirect()->route('product.show', $product->id)->withSuccess('拼團(tuán)創(chuàng)建成功');
}

(2) Participate in group activities

In the controller file, we write a join() method to implement the function of participating in group activities. The specific code is as follows:

public function join(Request $request, $id)
{
    $group = Group::findOrFail($id);

    $user_id = Auth::id();
    $product_id = $group->order->product_id;

    // 檢查用戶是否已參加該拼團(tuán)活動(dòng)
    $order = Order::where('user_id', $user_id)->where('product_id', $product_id)->where('status', '待成團(tuán)')->first();
    if ($order) {
        return redirect()->route('product.show', $product_id)->withError('您已參加該拼團(tuán)活動(dòng)');
    }

    // 檢查拼團(tuán)活動(dòng)是否已過期
    if ($group->expired_at < Carbon::now()) {
        return redirect()->route('product.show', $product_id)->withError('該拼團(tuán)活動(dòng)已過期');
    }

    // 檢查拼團(tuán)人數(shù)是否已滿
    $count = Order::where('product_id', $product_id)->where('status', '待成團(tuán)')->count();
    if ($count >= $group->size) {
        return redirect()->route('product.show', $product_id)->withError('該拼團(tuán)活動(dòng)已滿員');
    }

    $order = new Order;
    $order->user_id = $user_id;
    $order->product_id = $product_id;
    $order->quantity = 1;
    $order->price = $group->price;
    $order->status = '待支付';
    $order->group_id = $group->id;
    $order->save();

    // 跳轉(zhuǎn)到第三方支付頁面
    return redirect()->to('https://example.com/pay/' . $group->price);
}

5. Payment module

Since this article is just a demo, we do not use the real third-party payment interface and can jump directly to the payment success page.

4. Summary

The above is the entire process of using the Laravel framework to develop an online group-building platform. Of course, this article only provides basic functional implementation, and actual development needs to be expanded and improved according to specific needs. I hope that readers can become more familiar with the application of the Laravel framework through this article, and that readers can continue to explore and try in actual development.

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