How can I query item wise stocks and revenue in django ORM? - python-3.x

Question

class RevenueStockDashboardViewset(ViewSet):
sale = InvSaleDetail.objects.filter(sale_main__sale_type='SALE')
sale_returns = InvSaleDetail.objects.filter(sale_main__sale_type='RETURN')
purchase = InvPurchaseDetail.objects.filter(purchase_main__purchase_type='PURCHASE')
purchase_returns = InvPurchaseDetail.objects.filter(purchase_main__purchase_type='RETURN')
def list(self, request):
total_revenue = (self.sale.annotate(total=Sum('sale_main__grand_total'))
.aggregate(total_revenue=Sum('total'))
.get('total_revenue') or 0) - (self.sale_returns.annotate(total=Sum('sale_main__grand_total'))
.aggregate(total_revenue=Sum('total'))
.get('total_revenue') or 0) - (self.purchase.annotate(total=Sum('purchase_main__grand_total'))
.aggregate(total_revenue=Sum('total'))
.get('total_revenue') or 0) + (self.purchase_returns.annotate(total=Sum('purchase_main__grand_total'))
.aggregate(total_revenue=Sum('total'))
.get('total_revenue') or 0)
total_stocks = (self.purchase.annotate(total=Sum('qty'))
.aggregate(total_stock=Sum('total'))
.get('total_stock') or 0) - (self.purchase_returns.annotate(total=Sum('qty'))
.aggregate(total_stocks=Sum('total'))
.get('total_stock') or 0) - (self.sale.annotate(total=Sum('qty'))
.aggregate(total_stock=Sum('total'))
.get('total_stock') or 0) - (self.sale_returns.annotate(total=Sum('qty'))
.aggregate(total_stock=Sum('total'))
.get('total_stock') or 0)
return Response(
{
'total_revenue': total_revenue,
'total_stocks': total_stocks,
# 'item_wise_stocks': items,
}
)
Item Model:
class InvItem(CreatedInfoModel):
name = models.CharField(
max_length=100,
unique=True,
help_text="Item name should be max. of 100 characters",
)
code = models.CharField(
max_length=10,
unique=True,
blank=True,
help_text="Item code should be max. of 10 characters",
)
sale models:
class InvSaleDetail(CreatedInfoModel):
sale_main = models.ForeignKey(
InvSaleMain, related_name="inv_sale_details", on_delete=models.PROTECT
)
item = models.ForeignKey(InvItem, on_delete=models.PROTECT)
item_category = models.ForeignKey(InvItemCategory, on_delete=models.PROTECT)
cost = models.DecimalField(
max_digits=12,
decimal_places=2,
help_text="cost can have max value upto=9999999999.99 and default=0.0",
)
qty = models.DecimalField(
max_digits=12,
decimal_places=2,
help_text="Purchase quantity can have max value upto=9999999999.99 and min_value=0.0",
)
sale_qty = models.DecimalField(
max_digits=12,
decimal_places=2,
help_text="Sale quantity can be max value upto 9999999999.99",
)
purchase Models:
class InvPurchaseDetail(CreatedInfoModel):
purchase_main = models.ForeignKey(
InvPurchaseMain,
related_name="purchase_details",
on_delete=models.PROTECT,
)
item = models.ForeignKey(InvItem, on_delete=models.PROTECT)
item_category = models.ForeignKey(InvItemCategory, on_delete=models.PROTECT)
purchase_cost = models.DecimalField(
max_digits=12,
decimal_places=2,
default=0.0,
help_text="purchase_cost can be max value upto 9999999999.99 and default=0.0",
)
sale_cost = models.DecimalField(
max_digits=12,
decimal_places=2,
help_text="sale_cost can be max value upto 9999999999.99 and default=0.0",
)
qty = models.DecimalField(
max_digits=12,
decimal_places=2,
help_text="Purchase quantity can be max value upto 9999999999.99",
)
I have Inventory Dashboard where I want to show the item wise revenue and item wise stocks. I have done query for total stocks and revenue but I want item wise. If you need more information. Please let me Know.
There is purchase model and sale model, the sale_main and purchase_main is basically sale and puchase info and detail is detail about items we are adding.
I want basically to fetch item wise, calculate revenue as i did and show item wise.