Partial sum based on the values of another field
Question:
Given a model like this (example for the purpose of generalization):
Group
Value
1
2
1
5
1
64
2
1
2
4
How could I make a sum for each group and obtain the results for the sum of each group instead of the total sum of all the groups?
Until now I had done sums like this:
total_value = myModel.objects.aggregate(sum=Sum('value'))
The result would be: 2 + 5 + 64 + 1 + 4 = 76
Expected result (list or dict if possible):
Group 1: 71
Group 2: 5
Answers:
MyModel.objects.values('group').annotate(sum=Sum('value'))
Given a model like this (example for the purpose of generalization):
| Group | Value |
|---|---|
| 1 | 2 |
| 1 | 5 |
| 1 | 64 |
| 2 | 1 |
| 2 | 4 |
How could I make a sum for each group and obtain the results for the sum of each group instead of the total sum of all the groups?
Until now I had done sums like this:
total_value = myModel.objects.aggregate(sum=Sum('value'))
The result would be: 2 + 5 + 64 + 1 + 4 = 76
Expected result (list or dict if possible):
Group 1: 71
Group 2: 5
MyModel.objects.values('group').annotate(sum=Sum('value'))