如何使用窗体更改Flask会话字典中的值? [英] How to change values in Flask session dictionary using forms?
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问题描述
我的购物车基于会话并形成字典,如下所示:
[{'qty':1,'product_title':'Post num six','product_id':6},
{'qty':1,'product_title ':'Post 5','product_id':5},
{'qty':1,'product_title':'Fouth post','product_id':4}]
我需要在购物车中的每个产品的 /购物车路线中更改 qty
@ app.route('/ cart',methods = ['GET','POST'])
def shopping_cart():
page_header =Cart
if request.method == request.form中的'POST'和'update_cart':$ b $ for cart_item in session [ cart]:
cart_item [qty] + = 1#这是错误的
如果cart_item [qty]> 10:
flash(u'cartax中的最大金额(10)产品已达到','info')
cart_item [qty] = 10
flash(u' ('cart / cart.html',page_header = page_header)
以下是我的 cart.html 模板:
.. 。
{%if session.cart%}
< form action =method =post>
< div class =table-responsive>
< table class =table table-hover>
< thead>
< tr>
< th>名称< / th>
< th width =100> Qty< / th>
< / tr>
< / thead>
< tbody>
{%for cart_item在session.cart%}
< tr>
< td>< a href =/ post / {{cart_item.product_id}}> {{cart_item.product_title}}< / a>< / td>
< td>
< div class =form-group>
< input class =form-controltype =numbername =change_qtymin =1max =10value ={{cart_item.qty}}>
< / div>
< / td>
< / tr>
{%endfor%}
< / tbody>
< / table>
< / div>
< div class =clearfix>
< button type =submitname =update_cartclass =btn btn-info pull-right>更新购物车< / button>
< / div>
< / form>
{%else%}
< h2 style =color:red;>没有购物车会话=(< / h2>
{%endif% cart.html包含周期中的所有实例,并添加 change_qty 输入改变购物车中每个产品的数量。
问题是:如何改变每个产品在购物车中的数量?
解决方案会话对象不会自动检测对可变结构的修改,因此您需要设置
会话。修改= True
自己。
I'm writing shopping cart on Flask.
My cart based on session and forming dictionary like this:
[{'qty': 1, 'product_title': 'Post num six', 'product_id': 6},
{'qty': 1, 'product_title': 'Post five', 'product_id': 5},
{'qty': 1, 'product_title': 'Fouth post', 'product_id': 4}]
I need to change qty value in /cart route for every product in cart:
@app.route('/cart', methods=['GET', 'POST'])
def shopping_cart():
page_header = "Cart"
if request.method == 'POST' and 'update_cart' in request.form:
for cart_item in session["cart"]:
cart_item["qty"] += 1 # this is wrong
if cart_item["qty"] > 10:
flash(u'Maximum amount (10) products in cart is reached', 'info')
cart_item["qty"] = 10
flash(u'update_cart', 'warning')
return render_template('cart/cart.html', page_header=page_header)
Here is my cart.html template:
...
{% if session.cart %}
<form action="" method="post">
<div class="table-responsive">
<table class="table table-hover">
<thead>
<tr>
<th>Name</th>
<th width="100">Qty</th>
</tr>
</thead>
<tbody>
{% for cart_item in session.cart %}
<tr>
<td><a href="/post/{{ cart_item.product_id }}">{{ cart_item.product_title }}</a></td>
<td>
<div class="form-group">
<input class="form-control" type="number" name="change_qty" min="1" max="10" value="{{ cart_item.qty }}">
</div>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
<div class="clearfix">
<button type="submit" name="update_cart" class="btn btn-info pull-right">Update Cart</button>
</div>
</form>
{% else %}
<h2 style="color: red;">There is no cart session =(</h2>
{% endif %}
In cart.html covers all instances in cycle and adds change_qty input to change quantity of each product in cart.
The question is: how i can change quantity of each product in cart?
解决方案 The session object doesn't detect modifications to mutable structures automatically so you need to set
session.modified = True
yourself.
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