Consider a table called DataTable. It has two fields, A and B. I want to return all rows of this table plus annotate a field called C that is a concatenation of A and B.
Here is what I have tried
from django.db.models import CharField, Value from .models import DataTable def Test(request): query = DataTable.objects.all().annotate(C=Value('A' + '-' + 'B', output_field=CharField())) # the rest of the function...
problem here is that C is literally just the string literal “A – B” for every returned row. I want to use the actual values of A and B into that concatenation.
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Answer
looks like you need concat:
from django.db.models import CharField, Value from django.db.models.functions import Concat query = DataTable.objects.annotate(C=Concat('A', Value('-'), 'B', output_field=CharField()))