I have a model:
lifecycle_status_choice = (
('Lead', 'Lead'),
('Opportunity', 'Opportunity'),
('Customer', 'Customer'),
)
bill_status_choice = (
('Paid','Paid'),
('Pending','Pending'),
('Partially Paid','Partially Paid'),
)
class Bill(models.Model):
company_name = models.ForeignKey(Contact, on_delete=models.CASCADE)
grand_tot = models.DecimalField(max_digits=9, decimal_places=2)
status = models.CharField(max_length=100, choices=bill_status_choice)
lifecycle_status = models.CharField(max_length=100, choices=lifecycle_status_choice)
...
which has a fk to:
class Contact(models.Model):
associated_company = models.CharField(max_length=100)
...
Views.py
...
from bills.models import Bill
from django.db.models import Sum
def home(request):
data = Bill.objects.all().order_by('date')
context = {
'data ':data ,
}
return render(request, 'home.html',context)
Front end chartsjs:
const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
type: 'doughnut',
data: {
labels: [
{% for data in data %} '{{data.company_name}}', {% endfor %}
],
datasets: [{
label: '# of Votes',
data: [{% for data in data %} {{ data.grand_tot }}, {% endfor %}],
The problem: I am using charts.js in my front end template and I am trying to display a chart in which as a user creates new company names the chart should display the total amount grouped by company names how would I achieve that?
eg: I create two invoices for "xyz" company with amounts: $100 & $200 || & create one invoice for "abc" company with amount $100 I want the chart to group the "xyz" invoice amounts and display $300 (ie:100+200) || & "abc" = $100
FYI I'm aware I'm using something completely wrong in the view function but its just something that I tried. Thanks
You can .annotate(…) [Django-doc] with:
from django.db.models import Sum
Contact.objects.annotate(bills_total=Sum('bill__grand_tot'))The Contact objects that arise from this QuerySet will have an extra attribute .bills_total.
You can filter this with as satus paid with:
from django.db.models import Q, Sum
contacts = Contact.objects.annotate(bills_total=Sum('bill__grand_tot', filter=Q(bill__status='Paid')))You can thus for example render this with:
{% for contact in contacts %}
{{ contact.associated_company }}: {{ contact.bills_total }}
{% endfor %}
or convert it to a list of Python dictionaries for example and then return it as a JSON blob.