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16 lines
573 B
Python
16 lines
573 B
Python
from django.db.models import OuterRef, QuerySet, Subquery
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class CircuitQuerySet(QuerySet):
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def annotate_sites(self):
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"""
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Annotate the A and Z termination site names for ordering.
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"""
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from circuits.models import CircuitTermination
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_terminations = CircuitTermination.objects.filter(circuit=OuterRef('pk'))
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return self.annotate(
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a_side=Subquery(_terminations.filter(term_side='A').values('site__name')[:1]),
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z_side=Subquery(_terminations.filter(term_side='Z').values('site__name')[:1]),
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)
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