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Full Version: Django Help Needed urgently
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I am trying to create a simple inventory app using Django. My project came to a stand still when I couldn't find a solution for calculating opening and closing balances on the fly/dynamically. I tried for days researching on the web but no progress yet. If anyone could help i will appreciate.

All I need is a query to calculate opening and closing balances dynamically.

My Models:

class Item(models.Model):
name = models.CharField(max_length=30)
buying_price = models.PositiveIntegerField()
selling_price = models.PositiveIntegerField()
quantity = models.PositiveIntegerField()

def __str__(self):
class SalesSheet(models.Model):
txn_date = models.DateField()
item = models.ForeignKey(Item, on_delete=models.CASCADE)
purchases = models.PositiveIntegerField()
sales = models.PositiveIntegerField()
What I want after posting purchases and sales is an output like this

id date item opening purchases sales closing 1 1-1-19 abc 10 20 5 25 2 2-12-19 def 25 20 10 35 3 3-1-19 abc 25 10 25 10 4 4-1-19 def 35 10 30 15 5 7-1-19 abc 10 0 0 10 6 9-1-19 def 15 0 5 10
and so on.....

I am using item.quantity to store opening stock for the first time only.

Take into consideration that there will be different items and also back dated entries.

help me guys.