Hi!!!,
When you made a sale, only must to update the products sold.
For example:
db(db.product.amount.id = product_id ).update(amount=amount1)
El jueves, 5 de septiembre de 2019, 15:04:57 (UTC-3), mostwanted escribió:
>
> Everything you are saying i understand but I cant put into code, every
> attempt I have made all day today just went up on traceback-flames! I am
> recording sales made into the sales db through the buy function:
> def buy():
> if not session.cart:
> session.flash = 'Add something to shopping cart'
> redirect(URL('index'))
> invoice = session.invoiceNo
> total = sum(db.product(id).price*qty for id,qty in session.cart.items
> ())
> for session.key, session.value in session.cart.items():
> db.sales.insert(invoice=invoice,buyer=auth.user.id,product =
> session.key,quantity = session.value,price = db.product(session.key).price
> )
>
> session.cart.clear()
> session.flash = 'Sale Complete'
> redirect(URL('invoice',args=invoice))
> return dict(cart=session.cart,form=form,total=total)
>
> My cart doest really do alot,
> def cart():
> if not session.cart:
> session.flash = 'Add something to shopping basket'
> redirect(URL('index'))
> total = sum(db.product(id).price*qty for id,qty in session.cart.items
> ())
> vat=round(total*0, 2)
> totalPrice=total+vat
> session.invoiceNo="".join([random.choice(string.ascii_uppercase)\
> for i in range(4)])+"-"+"".join([random.choice(string.
> digits)\
> for i in range(4)])+
> "-"+"".join([random.choice(string.ascii_uppercase)\
>
> for i in range(4)])+"-"+"".join([random.choice(string.digits)\
> for i in range(4)])
>
> #CONVERT TO INTEGER TO BE ABLE TO UTILIZE {{=MoneyFormat()}} FUNCTION
> text=request.vars.name
> if text is None:
> text=int(0)
> if text:
> text=int(request.vars.name)
> change=float(text)-totalPrice
> else:
> change=int(0)
> return dict(cart=session.cart, total=total, totalPrice=totalPrice, vat
> =vat, text=text, change=change, invoiceNo=session.invoiceNo)
>
>
> From what you said I felt if i could identify the sold items in the sale
> table and match them against the items in the product table and then from
> there update those that have the same id. As a concept in my head its easy
> but implementing it goes side ways:
>
> Mostwanted
>
> On Thursday, September 5, 2019 at 8:21:56 AM UTC+2, Dave S wrote:
>>
>>
>>
>> On Wednesday, September 4, 2019 at 10:59:21 PM UTC-7, mostwanted wrote:
>>>
>>> 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
>>>
>>>
>>>
>> index() looks like it spends a great deal of time subtracting everything
>> in sales from everything in products.
>>
>> I think you are recording the product id in the cart. Are you then (on
>> check-out, I presume) recording the product id in db.sales?
>>
>> if so , then you don't need the select() on all products.
>> Instead, use the product id in each row of db.sales to select the product
>> entry to update.
>>
>> You probably want a way to identify which rows in db.sales have already
>> been processed (that is, which quantities have already been subtracted from
>> the the available in the corresponding product entry).
>>
>> /dps
>>
>>
>>
>
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