Initialize
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# flask_crud_app
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# Flask CRUD application
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Example app for inventory management, built using python flask. Forked from [this project](https://github.com/MovieTone/crud-flask-export-csv).
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A CRUD application using python flask
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**Preview of original app:**
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123
main.py
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123
main.py
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from flask import Flask, request, render_template, redirect, abort, send_file
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from sqlalchemy import exc
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from models import *
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import csv
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app = Flask(__name__)
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app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///inventory.db'
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app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
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db.init_app(app)
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@app.before_first_request
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def create_table():
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db.create_all()
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@app.route('/')
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def index():
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return redirect('/view')
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@app.route('/create/', methods=['GET', 'POST'])
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def create():
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if request.method == 'GET':
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return render_template('create.html')
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if request.method == 'POST':
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sku = request.form['sku']
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name = request.form['name']
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description = request.form['description']
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price = request.form['price']
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try:
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qty = int(request.form['qty'])
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except ValueError:
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return render_template('create.html', exc='qty')
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item = Item(sku=sku, name=name, description=description, price=price, qty=qty)
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try:
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db.session.add(item)
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db.session.commit()
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except exc.IntegrityError:
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return render_template('create.html', exc='integrity')
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except exc.StatementError:
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return render_template('create.html', exc='price')
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return redirect('/view')
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@app.route('/view/', methods=['GET', 'POST'])
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def view_list():
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if request.method == 'POST':
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outfile = open('inventory_export.csv', 'w', newline='')
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outcsv = csv.writer(outfile)
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records = db.session.query(Item).all()
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outcsv.writerow([column.name for column in Item.__mapper__.columns])
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[outcsv.writerow([getattr(curr, column.name) for column in Item.__mapper__.columns]) for curr in records]
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outfile.close()
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return send_file('inventory_export.csv', as_attachment=True)
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items = Item.query.all()
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return render_template('viewlist.html', items=items)
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@app.route('/view/<int:sku>/')
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def view_item(sku):
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item = Item.query.filter_by(sku=sku).first()
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if item:
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return render_template('viewitem.html', item=item)
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return f"Item {sku} is not found"
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@app.route('/update/<int:sku>/', methods=['GET', 'POST'])
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def update(sku):
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item = Item.query.filter_by(sku=sku).first()
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if request.method == 'POST':
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if item:
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sku = request.form['sku']
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name = request.form['name']
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description = request.form['description']
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try:
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price = float(request.form['price'])
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except ValueError:
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return render_template('update.html', item=item, exc='price')
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try:
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qty = int(request.form['qty'])
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except ValueError:
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return render_template('update.html', item=item, exc='qty')
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try:
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setattr(item, 'sku', sku)
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setattr(item, 'name', name)
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setattr(item, 'description', description)
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setattr(item, 'price', price)
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setattr(item, 'qty', qty)
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db.session.commit()
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except exc.IntegrityError:
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return render_template('update.html', item=item, exc='integrity')
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except (exc.StatementError, exc.InvalidRequestError) as e:
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return render_template('update.html', item=item, exc='price')
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return redirect(f'/view/')
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return f"Item {sku} is not found"
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return render_template('update.html', item=item)
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@app.route('/delete/<int:sku>/', methods=['GET', 'POST'])
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def delete(sku):
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item = Item.query.filter_by(sku=sku).first()
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if request.method == 'POST':
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if item:
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db.session.delete(item)
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db.session.commit()
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return redirect('/view')
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abort(404)
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return render_template('delete.html')
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if __name__ == '__main__':
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app.run(host='localhost', port=5000)
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24
models.py
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24
models.py
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from flask_sqlalchemy import SQLAlchemy
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db = SQLAlchemy()
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class Item(db.Model):
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__tablename__ = "Item"
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id = db.Column(db.Integer(), primary_key=True)
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sku = db.Column(db.String(), unique=True)
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name = db.Column(db.String())
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description = db.Column(db.String())
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price = db.Column(db.DECIMAL(9, 2))
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qty = db.Column(db.Integer())
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def __init__(self, sku, name, description, price, qty):
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self.sku = sku
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self.name = name
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self.description = description
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self.price = price
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self.qty = qty
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def __repr__(self):
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return f"{self.name}:{self.sku}"
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23
requirements.txt
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23
requirements.txt
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# This file is used by pip to install required python packages
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# Usage: pip install -r requirements.txt
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# Flask Framework
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click==7.1.2
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Flask==2.0.2
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itsdangerous==2.0.1
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Jinja2==3.0.0
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MarkupSafe==2.0.0rc2
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Werkzeug==2.0.0
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# Flask Packages
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Flask-Login==0.4.0
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Flask-Migrate==2.0.2
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Flask-Script==2.0.5
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Flask-SQLAlchemy==2.4.0
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Flask-WTF==0.14.2
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Flask-User==1.0.1.5
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SQLAlchemy==1.3.24
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# Automated tests
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pytest==3.0.5
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pytest-cov==2.4.0
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58
templates/create.html
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58
templates/create.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Add an Item</title>
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</head>
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<style>
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form { display: table; margin: 0 auto;}
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form p { display: table-row; }
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label { display: table-cell; }
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input { display: table-cell; }
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</style>
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<body>
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<div align="center">
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<a href="/create">Add</a> |
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<a href="/view">View</a>
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</div>
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<h2 align="center">Add new Item</h2>
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<form method = "POST">
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<p>
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<label for="sku">SKU:</label>
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<input id="sku" type = "text" name = "sku" required/>
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</p>
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<p>
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<label for="name">Name:</label>
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<input id="name" type = "text" name = "name" required/>
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</p>
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<p>
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<label for="desc">Description:</label>
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<input id="desc" type = "text" name = "description" required/>
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</p>
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<p>
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<label for="price">Price:</label>
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<input id="price" type = "integer" name = "price" required/>
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</p>
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<p>
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<label for="qty">Quantity:</label>
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<input id="qty" type = "integer" name = "qty" required/>
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</p>
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<p><input type = "submit" value = "Submit" /></p>
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</form>
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<p align="center">
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{% if exc == 'integrity' %}
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Item with such SKU already exists
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{% endif %}
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{% if exc == 'price' %}
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Data input error. Price must have a numeric value
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{% endif %}
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{% if exc == 'qty' %}
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Data input error. Quantity must be an integer
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{% endif %}
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</p>
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</body>
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</html>
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20
templates/delete.html
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templates/delete.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Delete Item</title>
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</head>
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<body align="center">
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<div align="center">
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<a href="/create">Add</a> |
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<a href="/view">View</a>
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</div>
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<form action='' method="post">
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Do you want to delete the item?
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<input type = "submit" value="Confirm">
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<a href='/view'>Cancel</a>
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</form>
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</body>
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</html>
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59
templates/update.html
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59
templates/update.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Update Item</title>
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</head>
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<style>
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form { display: table; margin: 0 auto;}
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form p { display: table-row; }
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label { display: table-cell; }
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input { display: table-cell; }
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</style>
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<body>
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<div align="center">
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<a href="/create">Add</a> |
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<a href="/view">View</a>
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</div>
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<h2 align="center">Update Item</h2>
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<form action='' method = "POST">
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<p>
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<label for="sku">SKU:</label>
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<input id="sku" type = "text" name = "sku" value="{{item.sku}}" required/>
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</p>
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<p>
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<label for="name">Name:</label>
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<input id="name" type = "text" name = "name" value="{{item.name}}" required/>
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</p>
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<p>
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<label for="desc">Description:</label>
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<input id="desc" type = "text" name = "description" value="{{item.description}}" required/>
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</p>
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<p>
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<label for="price">Price:</label>
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<input id="price" type = "integer" name = "price" value="{{item.price}}" required/>
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</p>
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<p>
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<label for="qty">Quantity:</label>
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<input id="qty" type = "integer" name = "qty" value="{{item.qty}}" required/>
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</p>
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<p>
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<input type = "submit" value = "Update" />
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</p>
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</form>
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<p align="center">
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{% if exc == 'integrity' %}
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Item with such SKU already exists
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{% endif %}
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{% if exc == 'price' %}
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Data input error. Price must have a numeric value
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{% endif %}
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{% if exc == 'qty' %}
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Data input error. Quantity must be an integer
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{% endif %}
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</p>
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</body>
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</html>
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63
templates/viewList.html
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63
templates/viewList.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>View Inventory</title>
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</head>
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<body align="center">
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<div align="center">
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<a href="/create">Add</a> |
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<a href="/view">View</a>
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</div>
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<h2>Item Inventory</h2>
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<table border="1" align="center">
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<tr>
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<th>SKU</th>
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<th>Name</th>
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<th>Description</th>
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<th>Price</th>
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<th>Quantity</th>
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</tr>
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{% for item in items %}
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<tr>
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<td>
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{{item.sku}}
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</td>
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<td>
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{{item.name}}
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</td>
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<td>
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{{item.description}}
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</td>
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<td>
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${{item.price}}
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</td>
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<td>
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{{item.qty}}
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</td>
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<td>
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<form action="/update/{{item.sku}}" method="get">
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<button type="submit">Edit</button>
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</form>
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</td>
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<td>
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<form action="/delete/{{item.sku}}" method="get">
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<button type="submit">Delete</button>
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</form>
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</td>
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</tr>
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{% endfor %}
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</table>
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<br>
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<form action="/create" method="get">
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<button type="submit">Add new Item</button>
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</form>
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<form method="POST">
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<button type="submit">Export Data</button>
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</form>
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</body>
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</html>
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