I have a website where I am selling items, what I desperately want to
achieve is to be able to show the buyers the remaining number of each item.
I have 2 tables, the table that has all the items being sold & has a field
amount which is the current number of items in stock and the other table
which records sales as customers buy and has a field quantity which is the
quantity of items purchased. After a customer has made a purchase I want to
be able to subtract quantity from amount and have difference update and be
the new value for amount.
I wrote some controller code which is not achieving this, it is instead
updating the amount field for all items with the same figure.
THE VIEW
{{extend 'layout.html'}}
<div class="row">
{{for p in products:}}
{{if p.product_type=="Earrings":}}
<div class="clothes">
<h4 style="color: #ff69b4;">{{=p.name}}</h4>
<h7 style="color: #ff69b4;">{{=p.amount}} available in stock</h7>
<h5>
<span style="color: aqua; font-weight:
bold;">{{=MoneyFormat(p.price)}}</span>
</h5>
<img class="magnify" src="{{=URL('download',args=p.image)}}"
height="200px"/>
<br />
<span id="{{='item%s'%p.id}}" style="font-weight: bold; color:
red;">{{=session.cart.get(p.id,0)}}</span> in cart - {{=A('add to
cart',callback=URL('cart_callback',vars=dict(id=p.id,action='add')),target='item%s'%p.id,_class='button
pill')}}
<br />
<span style="font-size:12px;font-weight: bold; color: #ff69b4;">Click the
image to enlarge</span>
<br />
</div>
{{pass}}
{{pass}}
</div>
THE CART_CALLBACK FUNCTION
def cart_callback():
id = int(request.vars.id)
if request.vars.action == 'add':
session.cart[id]=session.cart.get(id,0)+1
if request.vars.action == 'sub':
session.cart[id]=max(0,session.cart.get(id,0)-1)
return str(session.cart[id])
MY FUNCTION FOR UPDATING AFTER PURCHASES
def index():
if not auth.user:
response.flash=T('PLEASE LOG IN FIRST TO BE ABLE TO GET THE MENU AND
BUY')
products = db(db.product).select(orderby=db.product.name)
num=db(db.sale).select()
for n in num:
quantity=n.quantity
if quantity is None:
quantity=0
for p in products:
amount1=p.amount-quantity
db(db.product.amount).update(amount=amount1)
return locals()
What should happen is that every time a customer buys whatever number of
items a new figure showing reduction in number of items should be displayed.
Regards;
Mostwanted
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