How to add more than item to the session in Flask

问题

I've created a add-to-cart in my website and it works just great.

Am using Jquery.getJSON to make the request to get the value of the chosen product, here is the code:

    $(function() {
      $('a#process_menu').bind('click', function() {
        /*var amount = document.getElementById('kale').value;*/
        $.getJSON('{{url_for("get_the_order")}}', {
          menu_order: $(this).text(), price_order: $('input[name="kalkal"]').val(),
        }, function(data) {
          location.reload();
        });
        return false;
      });
    });

and here is the function that receiving the request:

@app.route('/get_the_order')
def get_the_order():

    global the_order_list

    try:

        the_order_list = []
        sum_list = []

        get_order = request.args.get('menu_order', 0, type=str)
        get_price = request.args.get('price_order', 0, type=str)

        the_order_list.append(get_order)
        sum_list.append(get_price)

        session['theOrder'] = ' '.join(the_order_list)
        session['price'] = ' '.join(sum_list)

        return jsonify(result=the_order_list + sum_list)

    except Exception as e:
        return redirect("menu")

and here i have the template that shows all the products:

{% if entries_menu %}
    {% for menu_ent in entries_menu %}
        <div class="col-sm-6 col-md-3 col-lg-3 {{menu_ent.categorie}}">
            <div class="portfolio-item">
                <div class="hover-bg">
                    <a id="process_menu">
                        <div class="hover-text">
                            <h4 id="title">{{menu_ent.title}}</h4>
                            <small id="price">{{menu_ent.price}}</small>
                            <div class="clearfix"></div>
                            <i class="fa fa-plus add_basket"></i>
                            <div class="counter-order">
                                <div class="row">
                                    <div class="col-md-3">
                                        <form>
                                            <fieldset>
                                                <div class="form-group">
                                                    <input id="kale" name="kalkal" class="form-control" type="number" value="1" min="1" max="999" />
                                                </div>
                                            </fieldset>
                                        </form>
                                    </div>
                                </div>
                            </div>
                        </div>
                        <img src="../../static/{{menu_ent.path}}" class="img-responsive" alt="..." id="image-menu">
                    </a>
                </div>
                <h4 class="brand bold">{{menu_ent.title}}</h4>
                <span class="price pull-right">{{menu_ent.price}} </span><span class="amount pull-right"> {{menu_ent.amount}}</span>
                <p id="descr">{{menu_ent.descr}}</p>
            </div>
        </div>
    {% endfor %}
{% endif %}

here i made this function to put all the products within array and showing them above where the cart exist beside the header, this is the file where all the logic happens also where it should show what i want:

        {% if session.logged_in %}

            {% if session.theOrder %}
                <div class="confirm-cancel">
                    <a href="{{url_for('flush')}}"><i class="fa fa-close fa-3x btn-danger"></i></a>
                    <a href="{{url_for('order_dish')}}"><i class="fa fa-check fa-3x btn-success"></i></a>
                </div>
            {% endif %}

            <li class='main'><a href='/#main'><span>Main</span></a></li>
            <li class="comfort"><a href='/#ckidki' ><span>Chief</span></a></li>
            <li class="menu"><a href='/menu/' ><span>Menu</span></a></li>
            <li class="order"><a href="/order/" ><span>Make an order</span></a></li>
            <li class="contact"><a href='/#contact' ><span>Contact us</span></a></li>
            <li class="last orders"><a href='/admin/' ><span>Admin</span></a></li>

            {% if session.theOrder %}

                <li class="basket"><i class="fa fa-shopping-basket fa-3x" style="color: #fff;"><p class="pull-left" id="bask" style="font-size: 19px; font-weight: 600; font-family: "Russo One",sans-serif;">{{session.get('theOrder')}} &nbspx{{session.get('price')}}</p></i></li>

            {% else %}

                <li class="basket"><i class="fa fa-shopping-basket fa-3x" style="color: #fff;"><p class="pull-left" id="bask" style="font-size: 19px; font-weight: 600; font-family: "Russo One",sans-serif;">0$ &nbsp&nbsp</p></i></li>

            {% endif %}
        {% endif %}

The problem is i can't get all the products that i've been chosen inside the session, so if i checked the products list i see only one, in fact , am getting only the clicked item every time.

Please, any suggestion how to make that work, anyway please, any help would be tons appreciated .

回答1:

I modified your code like this:

    the_order_list = session['theOrder']
    sum_list = session['price']

    the_order_list.append(get_order)
    sum_list.append(get_price)

    session['theOrder'] = the_order_list
    session['price'] = sum_list

回答2:

I was facing the same issue and finally got this answer!

@app.route('/addtocart/')  #加入购物车选项
def addtocart():
id = request.args.get('id')
if 'cart' not in session:
    session['cart'] = []  # 
cart_list = session['cart']
cart_list.append(id)
session['cart'] = cart_list  # 
print(session)

cart_list = session['cart'] will return an empty list. Then, after cart_list.append(id), you've got a list with length 1. The key sentence is session['cart'] = cart_list, if you don't do this, your list's maximum length is 2.

来源：https://stackoverflow.com/questions/34630709/how-to-add-more-than-item-to-the-session-in-flask