Thank you Simon, that worked. -- John
On Sun, Jul 21, 2019 at 8:55 PM Simon Charette <charett...@gmail.com> wrote:
> Assuming you have a model definition `Salesperson` you could use
>
> Salesperson.object.annotate(
> sales_amount=Sum('sales__sales_amount'),
> )
>
> But given you mentioned 'salesperson' is a text field you can do
>
> persons = Sales.objects.values('salesperson').annotate(
> sum_sales_amount=Sum('sales_amount')
> )
> for person in persons:
> print('Salesperson %s sold %d dollars' % (person['salesperson'],
> person['sum_sales_amount'])
>
> Note that .values() before annotating a an aggregation function results in
> a GROUP BY
> which should should prefer over using DISTINCT.
>
> Cheers,
> Simon
>
> Le dimanche 21 juillet 2019 21:20:37 UTC-4, John Gateley a écrit :
>>
>> Hello,
>>
>> Python version: Python 3.7.2
>> Django version: 2.2.3
>>
>> I want to combine distinct and annotate(Sum(...)), and get the following
>> error:
>> NotImplementedError: annotate() + distinct(fields) is not implemented.
>>
>> To describe: I have a bunch of sales entries like:
>> 'John', 100
>> 'Sam', 50
>> 'John', 200
>> (the model is a text field for salesperson and an integer field for
>> sales_amount)
>>
>> I want to write a query like:
>> res = Sales.objects.distinct('salesperson').annotate(Sum('sales_amount'))
>> for person in res:
>> print('Salesperson %s sold %d dollars' % (person.salesperson,
>> person.sales_amount__count))
>>
>> I would expect:
>> Salesperson John sold 300 dollars
>> Salesperson Sam sold 50 dollars
>>
>> Instead it generates the above error. Is there a way to do this?
>>
>> Thank you,
>>
>> John
>>
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