project Documentation: Next.js Finance App & Django Polling App ## 1. Next.js Finance App Project Overview This project is a finance application built using Next.js. It allows users to log in, view invoices, collected amounts, add or edit customers, and view customer and invoice pages. It also provides a recent revenue summary for financial tracking. The app uses PostgreSQL as the primary database, enhanced with MySQL logic for optimized queries. The app is successfully deployed on Vercel. ** **Features** Authentication: Secure login system to access personal accounts. Invoice Management: View, edit, and manage invoices and track the total amount collected. Customer Management: Add, view, and edit customer information. Revenue Summary: View the most recent revenue generated from customer invoices. Database: PostgreSQL integrated with MySQL logic. Deployment: Deployed on Vercel. **Installation** Step 1: Install Node.js and Next.js Install Node.js `sudo apt update sudo apt install nodejs` Install Next.js and create a new project `npx create-next-app@latest finance-app cd finance-app npm install`` Step 2: Install PostgreSQL Install PostgreSQL `sudo apt update sudo apt install postgresql postgresql-contrib` Start PostgreSQL `sudo service postgresql start` Step 3: Setup MySQL (Optional for Logic) Install MySQL `sudo apt install mysql-server` Start MySQL `sudo service mysql start` Step 4: Run Development Server Start the Next.js development server `npm run dev` Key Concepts 1. Routing Next.js provides a file-based routing system. The app has routes for invoices, customers, and revenue pages: js ``// Example: Invoice route in pages/invoices/[id].js import { useRouter } from 'next/router'; export default function InvoicePage() { const router = useRouter(); const { id } = router.query; return

Invoice ID: {id}

; }` ` 2. Data Fetching Server-side rendering (SSR) with getServerSideProps ensures real-time data updates for viewing recent revenue and invoice details: js `` export async function getServerSideProps() { const invoices = await fetchInvoicesFromDB(); return { props: { invoices } }; }` ` 3. Form Validation Using react-hook-form and yup for form validation when adding/editing customer information: js `import { useForm } from 'react-hook-form'; import * as yup from 'yup'; const schema = yup.object().shape({ customerName: yup.string().required(), }); export default function AddCustomer() { const { register, handleSubmit } = useForm({ validationSchema: schema, }); const onSubmit = data => console.log(data); return ( ); }` 4. Error Handling Handled via custom error pages (404.js, 500.js) to enhance the user experience: js `export default function Custom404() { return

404 - Page Not Found

; }` 5. Authentication Implemented using NextAuth.js to secure login functionality: js `` `import { signIn, useSession } from 'next-auth/react'; export default function Login() { const { data: session } = useSession(); if (session) { return

Welcome {session.user.email}

; } return ; } `` 6. Styling Styled using Tailwind CSS for responsive and modern UI design: html `

Recent Revenue

Total Revenue: $5000

` 7. Meta Data & SEO Handled through the Next.js component for SEO: js ` Finance App - Recent Revenue ` 2. Django Polling App Project Overview This project is a polling application created using Django. It allows users to vote on polls and view poll results. The admin interface enables the creation, modification, and deletion of polls. The project features two models: Question and Choice. Each Question has associated Choices for users to vote on, and each Choice tracks the number of votes. Features Public Polling: Allows users to view and vote on polls. Admin Interface: Manage polls, add questions, and track votes. Models: Question model with the question text and publication date. Choice model with the choice text and vote count, linked to Question. Installation Step 1: Install Python and Django bash Install Python `sudo apt update sudo apt install python3` Install Django `pip install django` Step 2: Create a Django Project `django-admin startproject polls_project cd polls_project ` # Start Django development server `python manage.py runserver` Step 3: Setup Database (SQLite by default) Migrate to initialize database `python manage.py migrate` Step 4: Create Polling Models python models.py from django.db import models class Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField('date published') class Choice(models.Model): question = models.ForeignKey(Question, on_delete=models.CASCADE) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)` Key Concepts 1. Routing Django's URL routing mechanism is used for linking views with URLs: python ` urls.py from django.urls import path from . import views urlpatterns = [ path('', views.index, name='index'), path('/', views.detail, name='detail'), path('/vote/', views.vote, name='vote'), ] ` 2. Form Validation Form validation is used when submitting votes, ensuring that valid data is submitted: python `forms.py from django import forms class VoteForm(forms.Form): choice = forms.ChoiceField(choices=[(choice.id, choice.choice_text) for choice in choices])` 3. Admin Interface The Django admin panel is used to manage questions and choices: python ` from django.contrib import admin from .models import Question, Choice admin.site.register(Question) admin.site.register(Choice)` 4. Error Handling Custom error messages are displayed if an invalid poll or vote is submitted: python `def vote(request, question_id): try: question = get_object_or_404(Question, pk=question_id) except KeyError: return render(request, 'polls/detail.html', {'error_message': "You didn't select a choice."})` 5. Styling The app uses Bootstrap for a clean, responsive interface: html `

Poll Results

` 6. Meta Data Meta tags are used to improve SEO: html ` `

liz_nzisa_ac2b0175672cd1c

Step by step guide to build an app using :1.next.js 2.django.

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