[FIXED] Updating data in a model from views Django

Issue

Hi i have a problem with updating data which is stored in a model. I would like to update the data which is stored in a model without a form, it is a function which sums up every user transaction and after every change I would like it to update.

my models:

class Portfolio(models.Model):
    portfolio_id = models.AutoField(primary_key=True,blank=True)
    portfolio_title = models.CharField(unique=True,max_length=200, null=True,blank=True)
    user_name = models.ForeignKey(Customer, null=True, on_delete=models.SET_NULL,blank=True)
    
    p_shares_num_sum = models.DecimalField(decimal_places=2,default=0,max_digits=999,editable=True, null=True,blank=True)
    p_last_mod_date = models.DateField(auto_now_add=False,null=True,editable=True,blank=True)
    p_comp_num_sum = models.DecimalField(decimal_places=2,default=0,max_digits=999,editable=True, null=True,blank=True)
    p_to_buy_percentage = models.CharField(max_length=200,editable=True, null=True,blank=True)
    p_profit_earned = models.DecimalField(decimal_places=6,editable=True,default=0,max_digits=999, null=True,blank=True)
    
    def __str__(self):
        return self.portfolio_title if self.portfolio_title else ''
    ```
The data which I want to send to it after every entry on site, with function

    shares_num = visdata.aggregate(Sum(('shares_number')))
    shares_num_sum = (shares_num['shares_number__sum'])
    shares_num_sum = format(shares_num_sum, ".0f")
    #profit_earned = visdata.aggregate(Sum(('course')))
    #profit_sum = (profit_earned['course__sum'])
    fare_paid = visdata.aggregate(Sum(('fare')))
    fare_sum = (fare_paid['fare__sum'])

    mod_date = visdata.order_by('-date').first().date
    
    to_buy = visdata.filter(buy_sell='+').count()
    to_sell = visdata.filter(buy_sell='-').count()

    to_buy_percentage = 0
    to_buy_percentage = to_buy / comp_number
    to_buy_percentage = (to_buy_percentage) * 100
    to_buy_percentage = format(to_buy_percentage, ".0f")
    to_buy_percentage = str(to_buy_percentage) + '%'
    
    #for customer restriction delete object and change VisData to visdata
    aggregated_data = visdata.annotate(
    intermid_result=F('course') - F('fare') 
    ).annotate(
    record_total=F('shares_number') * F('intermid_result')
    ).aggregate(
    total=Sum('record_total')
    )
    profit_earned = aggregated_data['total']
    profit_earned = format(profit_earned, ".2f")

summary_data = [int(shares_num_sum),int(comp_number),mod_date,str(to_buy_percentage),float(profit_earned)]

The function is written and prints me:
[4, 2, datetime.date(2021, 12, 20), '100%', 0.9]

Solution

If you have that data from function in your view, just get your current portolio object and asign to it's fields values, then call save() method from that object.

For example:

portfolio_object = Portfolio.objects.get(pk=some_pk)
portfolio_object.some_field = summary_data[0]
... here the rest of values

portfolio_object.save()

Remember that it'll execute every time you open that view, so think about some optimalization.

Answered By - Krystian K