Initialize

README.md

@@ -1,3 +1,5 @@
-# flask_crud_app
+# Flask CRUD application  
+Example app for inventory management, built using python flask. Forked from [this project](https://github.com/MovieTone/crud-flask-export-csv).  
 
-A CRUD application using python flask
+**Preview of original app:**  
+![image](https://github.com/MovieTone/crud-flask-export-csv/assets/15722914/442353d3-4064-4fc7-b796-5c40ac532338)  

main.py

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+from flask import Flask, request, render_template, redirect, abort, send_file
+from sqlalchemy import exc
+from models import *
+import csv
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///inventory.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db.init_app(app)
+
+
+@app.before_first_request
+def create_table():
+    db.create_all()
+
+
+@app.route('/')
+def index():
+    return redirect('/view')
+
+
+@app.route('/create/', methods=['GET', 'POST'])
+def create():
+    if request.method == 'GET':
+        return render_template('create.html')
+
+    if request.method == 'POST':
+        sku = request.form['sku']
+        name = request.form['name']
+        description = request.form['description']
+        price = request.form['price']
+        try:
+            qty = int(request.form['qty'])
+        except ValueError:
+            return render_template('create.html', exc='qty')
+
+        item = Item(sku=sku, name=name, description=description, price=price, qty=qty)
+
+        try:
+            db.session.add(item)
+            db.session.commit()
+        except exc.IntegrityError:
+            return render_template('create.html', exc='integrity')
+        except exc.StatementError:
+            return render_template('create.html', exc='price')
+
+        return redirect('/view')
+
+
+@app.route('/view/', methods=['GET', 'POST'])
+def view_list():
+    if request.method == 'POST':
+        outfile = open('inventory_export.csv', 'w', newline='')
+        outcsv = csv.writer(outfile)
+        records = db.session.query(Item).all()
+        outcsv.writerow([column.name for column in Item.__mapper__.columns])
+        [outcsv.writerow([getattr(curr, column.name) for column in Item.__mapper__.columns]) for curr in records]
+        outfile.close()
+        return send_file('inventory_export.csv', as_attachment=True)
+
+    items = Item.query.all()
+    return render_template('viewlist.html', items=items)
+
+
+@app.route('/view/<int:sku>/')
+def view_item(sku):
+    item = Item.query.filter_by(sku=sku).first()
+    if item:
+        return render_template('viewitem.html', item=item)
+    return f"Item {sku} is not found"
+
+
+@app.route('/update/<int:sku>/', methods=['GET', 'POST'])
+def update(sku):
+    item = Item.query.filter_by(sku=sku).first()
+    if request.method == 'POST':
+        if item:
+            sku = request.form['sku']
+            name = request.form['name']
+            description = request.form['description']
+            try:
+                price = float(request.form['price'])
+            except ValueError:
+                return render_template('update.html', item=item, exc='price')
+            try:
+                qty = int(request.form['qty'])
+            except ValueError:
+                return render_template('update.html', item=item, exc='qty')
+
+            try:
+                setattr(item, 'sku', sku)
+                setattr(item, 'name', name)
+                setattr(item, 'description', description)
+                setattr(item, 'price', price)
+                setattr(item, 'qty', qty)
+
+                db.session.commit()
+            except exc.IntegrityError:
+                return render_template('update.html', item=item, exc='integrity')
+            except (exc.StatementError, exc.InvalidRequestError) as e:
+                return render_template('update.html', item=item, exc='price')
+
+            return redirect(f'/view/')
+        return f"Item {sku} is not found"
+
+    return render_template('update.html', item=item)
+
+
+@app.route('/delete/<int:sku>/', methods=['GET', 'POST'])
+def delete(sku):
+    item = Item.query.filter_by(sku=sku).first()
+    if request.method == 'POST':
+        if item:
+            db.session.delete(item)
+            db.session.commit()
+            return redirect('/view')
+        abort(404)
+
+    return render_template('delete.html')
+
+
+if __name__ == '__main__':
+    app.run(host='localhost', port=5000)

models.py

@@ -0,0 +1,24 @@
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+
+class Item(db.Model):
+    __tablename__ = "Item"
+
+    id = db.Column(db.Integer(), primary_key=True)
+    sku = db.Column(db.String(), unique=True)
+    name = db.Column(db.String())
+    description = db.Column(db.String())
+    price = db.Column(db.DECIMAL(9, 2))
+    qty = db.Column(db.Integer())
+
+    def __init__(self, sku, name, description, price, qty):
+        self.sku = sku
+        self.name = name
+        self.description = description
+        self.price = price
+        self.qty = qty
+
+    def __repr__(self):
+        return f"{self.name}:{self.sku}"

requirements.txt

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+# This file is used by pip to install required python packages
+# Usage: pip install -r requirements.txt
+
+# Flask Framework
+click==7.1.2
+Flask==2.0.2
+itsdangerous==2.0.1
+Jinja2==3.0.0
+MarkupSafe==2.0.0rc2
+Werkzeug==2.0.0
+
+# Flask Packages
+Flask-Login==0.4.0
+Flask-Migrate==2.0.2
+Flask-Script==2.0.5
+Flask-SQLAlchemy==2.4.0
+Flask-WTF==0.14.2
+Flask-User==1.0.1.5
+SQLAlchemy==1.3.24
+
+# Automated tests
+pytest==3.0.5
+pytest-cov==2.4.0

templates/create.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Add an Item</title>
+</head>
+<style>
+    form  { display: table;      margin: 0 auto;}
+	form p     { display: table-row;  }
+	label { display: table-cell; }
+	input { display: table-cell; }
+</style>
+<body>
+    <div align="center">
+      <a href="/create">Add</a> |
+      <a href="/view">View</a>
+    </div>
+
+    <h2 align="center">Add new Item</h2>
+
+    <form method = "POST">
+        <p>
+            <label for="sku">SKU:</label>
+            <input id="sku" type = "text" name = "sku" required/>
+        </p>
+        <p>
+            <label for="name">Name:</label>
+            <input id="name" type = "text" name = "name" required/>
+        </p>
+        <p>
+            <label for="desc">Description:</label>
+            <input id="desc" type = "text" name = "description" required/>
+        </p>
+        <p>
+            <label for="price">Price:</label>
+            <input id="price" type = "integer" name = "price" required/>
+        </p>
+        <p>
+            <label for="qty">Quantity:</label>
+            <input id="qty" type = "integer" name = "qty" required/>
+        </p>
+        <p><input type = "submit" value = "Submit" /></p>
+    </form>
+
+    <p align="center">
+        {% if exc == 'integrity' %}
+            Item with such SKU already exists
+        {% endif %}
+        {% if exc == 'price' %}
+            Data input error. Price must have a numeric value
+        {% endif %}
+        {% if exc == 'qty' %}
+            Data input error. Quantity must be an integer
+        {% endif %}
+    </p>
+</body>
+</html>
+

templates/delete.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Delete Item</title>
+</head>
+<body align="center">
+    <div align="center">
+      <a href="/create">Add</a> |
+      <a href="/view">View</a>
+    </div>
+
+    <form action='' method="post">
+        Do you want to delete the item?
+        <input type = "submit" value="Confirm">
+        <a href='/view'>Cancel</a>
+    </form>
+
+</body>
+</html>

templates/update.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Update Item</title>
+</head>
+<style>
+    form  { display: table;      margin: 0 auto;}
+	form p     { display: table-row;  }
+	label { display: table-cell; }
+	input { display: table-cell; }
+</style>
+<body>
+    <div align="center">
+      <a href="/create">Add</a> |
+      <a href="/view">View</a>
+    </div>
+
+    <h2 align="center">Update Item</h2>
+
+    <form action='' method = "POST">
+        <p>
+            <label for="sku">SKU:</label>
+            <input id="sku" type = "text" name = "sku" value="{{item.sku}}" required/>
+        </p>
+        <p>
+            <label for="name">Name:</label>
+            <input id="name" type = "text" name = "name" value="{{item.name}}" required/>
+        </p>
+        <p>
+            <label for="desc">Description:</label>
+            <input id="desc" type = "text" name = "description" value="{{item.description}}" required/>
+        </p>
+        <p>
+            <label for="price">Price:</label>
+            <input id="price" type = "integer" name = "price" value="{{item.price}}" required/>
+        </p>
+        <p>
+            <label for="qty">Quantity:</label>
+            <input id="qty" type = "integer" name = "qty" value="{{item.qty}}" required/>
+        </p>
+        <p>
+            <input type = "submit" value = "Update" />
+        </p>
+    </form>
+
+    <p align="center">
+        {% if exc == 'integrity' %}
+            Item with such SKU already exists
+        {% endif %}
+        {% if exc == 'price' %}
+            Data input error. Price must have a numeric value
+        {% endif %}
+        {% if exc == 'qty' %}
+            Data input error. Quantity must be an integer
+        {% endif %}
+    </p>
+</body>
+</html>

templates/viewList.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>View Inventory</title>
+</head>
+<body align="center">
+    <div align="center">
+      <a href="/create">Add</a> |
+      <a href="/view">View</a>
+    </div>
+
+    <h2>Item Inventory</h2>
+
+    <table border="1" align="center">
+        <tr>
+            <th>SKU</th>
+            <th>Name</th>
+            <th>Description</th>
+            <th>Price</th>
+            <th>Quantity</th>
+        </tr>
+    {% for item in items %}
+        <tr>
+            <td>
+                {{item.sku}}
+            </td>
+            <td>
+                {{item.name}}
+            </td>
+            <td>
+                {{item.description}}
+            </td>
+            <td>
+                ${{item.price}}
+            </td>
+            <td>
+                {{item.qty}}
+            </td>
+            <td>
+                <form action="/update/{{item.sku}}" method="get">
+                    <button type="submit">Edit</button>
+                </form>
+            </td>
+            <td>
+                <form action="/delete/{{item.sku}}" method="get">
+                    <button type="submit">Delete</button>
+                </form>
+            </td>
+        </tr>
+
+    {% endfor %}
+    </table>
+
+    <br>
+    <form action="/create" method="get">
+        <button type="submit">Add new Item</button>
+    </form>
+    <form method="POST">
+        <button type="submit">Export Data</button>
+    </form>
+</body>
+</html>