[Answered ]-Django annotate usage over an model instance other than query item

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Use aggregate:

e.companyreview_set.aggregate(overall_value = Sum('overall_rating'))

For:

class Employer(models.Model): 
     name = models.CharField(max_length=100)

class CompanyReview(models.Model): 
     employer = models.ForeignKey(Employer)
     overall_rating = models.IntegerField()
👤Udi

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