How can we set restrictions on page in flask app?

 if we want to the user had to login to view the page.

we can use this decorator   @login_required to enforce only login user can access the page.

@app.route('/private')

@login_required

def private_page():

purchase_form = PurchaseItemForm()

if request.method == "POST":

purchased_item = request.form.get('purchased_item')

p_item_object = Item.query.filter_by(name=purchased_item).first()

if p_item_object:

if current_user.can_purchase(p_item_object):

p_item_object.buy(current_user)

flash(f"Congratulations! You purchased {p_item_object.name} for {p_item_object.price}$", category='success')

else:

flash(f"Unfortunately, you don't have enough money to purchase {p_item_object.name}!", category='danger')

return redirect(url_for('private_page'))

if request.method == "GET":

items = Item.query.filter_by(owner=None)

for item in items:

print(item.name)

return render_template('market.html', items=items, purchase_form=purchase_form)