CODEWITHSUNDEEP
pythonpython-3.xdjangodjango-modelsdjango-views
Federico De Marco
Federico De Marco

Reputation: 341

Python and django, how to extract data from the queryset

I have a question for you. I have the following class: 

class StatoPatrimoniale(models.Model):
    reference_date=models.DateField()
    income=models.DecimalField()
    debt=models.DecimalField()

After that I have named a new variable last_account_year in th following manner: 

now=datetime.datetime.now()
last_account_year=float(now.year)-1

Now I want to create a function that give me the possibility to extract the incomeand debt objects filtering them using the last_account_year and the year in the reference_date. How could I get this result?

Upvotes: 0

Views: 383

Answers (2)

Bernardo Duarte
Bernardo Duarte

Reputation: 4264

You should use the model date field lookup:

StatoPatrimoniale.objects.filter(reference_date__year=last_account_year)

And in a function encapsulating the logic and fixing it to zero if it doesn't exists:

def func(year):
    queryset = StatoPatrimoniale.objects.filter(reference_date__year=year)
    return queryset if queryset.exists() else 0

Upvotes: 1

Houda
Houda

Reputation: 691

You can use .filter() to filter your query and values_list() to get values: here is an exemple:

StatoPatrimoniale.objects.filter(reference_date__year=last_account_year).values_list('income', 'debt')

Upvotes: 0

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