Initial commit: Tablet lending system with user-tablet many-to-many relationship
- Database schema: tablets, users, loans (junction table) - CLI app: minimal_app.py - Web apps: app.py (Flask), simple_app.py (http.server) - Features: loan management, search, user loans view, project notes - Git structure: CONTRIBUTING.md, .gitignore Generated by Mistral Vibe. Co-Authored-By: Mistral Vibe <vibe@mistral.ai>
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ijuanes
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app.py
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330
app.py
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#!/usr/bin/env python3
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"""
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Simple Tablet Lending and Return Management Web Application
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with SQLite backend
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"""
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from flask import Flask, render_template, request, redirect, url_for, flash
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import sqlite3
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import os
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from datetime import datetime
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app = Flask(__name__)
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app.secret_key = 'your_secret_key_here'
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# Database setup
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DATABASE = 'tablets.db'
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def get_db():
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"""Get database connection"""
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conn = sqlite3.connect(DATABASE)
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conn.row_factory = sqlite3.Row
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return conn
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def init_db():
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"""Initialize database with required tables"""
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with get_db() as conn:
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cursor = conn.cursor()
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# Create tablets table
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cursor.execute('''
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CREATE TABLE IF NOT EXISTS tablets (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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brand TEXT NOT NULL,
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model TEXT NOT NULL,
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serial_number TEXT UNIQUE NOT NULL,
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status TEXT DEFAULT 'available',
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notes TEXT
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)
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''')
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# Create users table
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cursor.execute('''
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CREATE TABLE IF NOT EXISTS users (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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name TEXT NOT NULL,
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email TEXT,
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phone TEXT,
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identification TEXT UNIQUE
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)
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''')
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# Create loans table
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cursor.execute('''
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CREATE TABLE IF NOT EXISTS loans (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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tablet_id INTEGER NOT NULL,
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user_id INTEGER NOT NULL,
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loan_date TEXT NOT NULL,
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return_date TEXT,
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status TEXT DEFAULT 'active',
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FOREIGN KEY (tablet_id) REFERENCES tablets (id),
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FOREIGN KEY (user_id) REFERENCES users (id)
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)
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''')
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conn.commit()
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@app.route('/')
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def index():
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"""Main page showing available tablets and active loans"""
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with get_db() as conn:
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cursor = conn.cursor()
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# Get available tablets
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cursor.execute("SELECT * FROM tablets WHERE status = 'available'")
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available_tablets = cursor.fetchall()
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# Get active loans
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cursor.execute('''
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SELECT l.id, t.brand, t.model, t.serial_number, u.name, l.loan_date
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FROM loans l
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JOIN tablets t ON l.tablet_id = t.id
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JOIN users u ON l.user_id = u.id
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WHERE l.status = 'active'
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''')
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active_loans = cursor.fetchall()
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return render_template('index.html',
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available_tablets=available_tablets,
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active_loans=active_loans)
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@app.route('/add_tablet', methods=['GET', 'POST'])
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def add_tablet():
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"""Add a new tablet to inventory"""
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if request.method == 'POST':
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brand = request.form['brand']
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model = request.form['model']
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serial_number = request.form['serial_number']
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notes = request.form['notes']
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try:
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with get_db() as conn:
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cursor = conn.cursor()
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cursor.execute('''
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INSERT INTO tablets (brand, model, serial_number, status, notes)
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VALUES (?, ?, ?, 'available', ?)
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''', (brand, model, serial_number, notes))
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conn.commit()
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flash('Tablet added successfully!', 'success')
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except sqlite3.IntegrityError:
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flash('Error: Serial number already exists!', 'error')
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return redirect(url_for('index'))
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return render_template('add_tablet.html')
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@app.route('/add_user', methods=['GET', 'POST'])
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def add_user():
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"""Add a new user"""
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if request.method == 'POST':
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name = request.form['name']
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email = request.form['email']
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phone = request.form['phone']
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identification = request.form['identification']
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try:
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with get_db() as conn:
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cursor = conn.cursor()
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cursor.execute('''
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INSERT INTO users (name, email, phone, identification)
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VALUES (?, ?, ?, ?)
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''', (name, email, phone, identification))
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conn.commit()
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flash('User added successfully!', 'success')
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except sqlite3.IntegrityError:
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flash('Error: Identification already exists!', 'error')
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return redirect(url_for('index'))
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return render_template('add_user.html')
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@app.route('/loan_tablet', methods=['GET', 'POST'])
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def loan_tablet():
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"""Loan a tablet to a user"""
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if request.method == 'POST':
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tablet_id = request.form['tablet_id']
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user_id = request.form['user_id']
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with get_db() as conn:
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cursor = conn.cursor()
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# Update tablet status
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cursor.execute("UPDATE tablets SET status = 'loaned' WHERE id = ?", (tablet_id,))
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# Create loan record
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loan_date = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
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cursor.execute('''
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INSERT INTO loans (tablet_id, user_id, loan_date, status)
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VALUES (?, ?, ?, 'active')
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''', (tablet_id, user_id, loan_date))
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conn.commit()
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flash('Tablet loaned successfully!', 'success')
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return redirect(url_for('index'))
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# Get data for form
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with get_db() as conn:
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cursor = conn.cursor()
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cursor.execute("SELECT * FROM tablets WHERE status = 'available'")
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available_tablets = cursor.fetchall()
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cursor.execute("SELECT * FROM users")
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users = cursor.fetchall()
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return render_template('loan_tablet.html',
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available_tablets=available_tablets,
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users=users)
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@app.route('/return_tablet/<int:loan_id>')
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def return_tablet(loan_id):
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"""Return a loaned tablet"""
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with get_db() as conn:
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cursor = conn.cursor()
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# Get loan information
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cursor.execute("SELECT tablet_id FROM loans WHERE id = ?", (loan_id,))
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loan = cursor.fetchone()
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if loan:
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tablet_id = loan['tablet_id']
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# Update loan status and return date
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return_date = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
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cursor.execute('''
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UPDATE loans SET status = 'returned', return_date = ? WHERE id = ?
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''', (return_date, loan_id))
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# Update tablet status
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cursor.execute("UPDATE tablets SET status = 'available' WHERE id = ?", (tablet_id,))
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conn.commit()
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flash('Tablet returned successfully!', 'success')
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else:
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flash('Error: Loan not found!', 'error')
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return redirect(url_for('index'))
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@app.route('/history')
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def history():
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"""Show loan history"""
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with get_db() as conn:
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cursor = conn.cursor()
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cursor.execute('''
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SELECT l.id, t.brand, t.model, t.serial_number, u.name,
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l.loan_date, l.return_date, l.status
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FROM loans l
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JOIN tablets t ON l.tablet_id = t.id
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JOIN users u ON l.user_id = u.id
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ORDER BY l.loan_date DESC
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''')
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loans = cursor.fetchall()
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return render_template('history.html', loans=loans)
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@app.route('/project_management')
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def project_management():
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"""Project management page with markdown editor for development notes"""
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return render_template('project_management.html')
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@app.route('/get_notes/<path:filename>')
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def get_notes(filename):
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"""Serve notes file content"""
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try:
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with open(filename, 'r', encoding='utf-8') as f:
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content = f.read()
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return content, 200, {
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'Content-Type': 'text/markdown; charset=utf-8',
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'Cache-Control': 'no-cache, no-store, must-revalidate',
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'Pragma': 'no-cache',
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'Expires': '0'
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}
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except FileNotFoundError:
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return '', 404
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except Exception as e:
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return str(e), 500
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@app.route('/save_notes', methods=['POST'])
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def save_notes():
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"""Save markdown notes to file"""
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data = request.get_json()
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content = data.get('content', '')
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filename = data.get('filename', 'notes_development/project_notes.md')
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try:
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# Ensure directory exists
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os.makedirs(os.path.dirname(filename), exist_ok=True)
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# Write content to file
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with open(filename, 'w', encoding='utf-8') as f:
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f.write(content)
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return {'status': 'success', 'message': 'Notes saved successfully'}
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except Exception as e:
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return {'status': 'error', 'message': str(e)}, 500
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@app.route('/user_loans')
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def user_loans():
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"""
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Show all loans grouped by user.
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This demonstrates the one-to-many relationship: one user can loan multiple tablets.
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"""
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with get_db() as conn:
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cursor = conn.cursor()
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# Get all users
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cursor.execute("SELECT * FROM users")
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users = cursor.fetchall()
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# Get all loans with tablet and user details
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cursor.execute('''
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SELECT l.id, l.tablet_id, l.user_id, l.loan_date, l.return_date, l.status,
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t.brand, t.model, t.serial_number,
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u.name, u.identification
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FROM loans l
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JOIN tablets t ON l.tablet_id = t.id
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JOIN users u ON l.user_id = u.id
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ORDER BY u.name, l.loan_date DESC
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''')
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loans = cursor.fetchall()
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# Group loans by user
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user_loans_map = {}
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for loan in loans:
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user_id = loan['user_id']
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if user_id not in user_loans_map:
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user_loans_map[user_id] = {
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'user': None,
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'loans': []
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}
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user_loans_map[user_id]['loans'].append(loan)
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# Attach user info
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for user in users:
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if user['id'] in user_loans_map:
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user_loans_map[user['id']]['user'] = user
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# Filter out users with no loans (optional - keep all users)
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# Convert to list for template
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user_loans_list = []
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for user in users:
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user_data = user_loans_map.get(user['id'], {'user': user, 'loans': []})
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user_loans_list.append(user_data)
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return render_template('user_loans.html', users_with_loans=user_loans_list)
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if __name__ == '__main__':
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# Initialize database
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init_db()
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# Create templates directory if it doesn't exist
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if not os.path.exists('templates'):
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os.makedirs('templates')
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app.run(debug=True, host='0.0.0.0', port=5000)
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