44 lines
1.7 KiB
Python
44 lines
1.7 KiB
Python
from django.db.models import BooleanField, Case, F, Manager, Q, QuerySet, Sum, Value, When
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from django.db.models.functions import Coalesce
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from django.utils.timezone import now
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class GatewayQuerySet(QuerySet):
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def with_usage_sums(self) -> QuerySet:
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today = now().date()
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current_month_start = today.replace(day=1)
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return self.annotate(
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daily_sum=Coalesce(Sum("transactions__amount", filter=Q(transactions__created__date=today)), Value(0.0)),
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monthly_sum=Coalesce(
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Sum("transactions__amount", filter=Q(transactions__created__date__gte=current_month_start)), Value(0.0)
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),
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)
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def can_be_used(self) -> QuerySet:
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qs = self.with_usage_sums()
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qs = qs.annotate(
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daily_ok=Case(
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When(daily_limit=0, then=Value(True)),
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When(daily_sum__lt=F("daily_limit"), then=Value(True)),
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default=Value(False),
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output_field=BooleanField(),
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),
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monthly_ok=Case(
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When(monthly_limit=0, then=Value(True)),
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When(monthly_sum__lt=F("monthly_limit"), then=Value(True)),
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default=Value(False),
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output_field=BooleanField(),
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),
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)
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return qs.annotate(
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can_be_used=Case(
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When(daily_ok=True, monthly_ok=True, is_active=True, then=Value(True)),
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default=Value(False),
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output_field=BooleanField(),
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)
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).order_by("-priority")
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class GatewayManager(Manager.from_queryset(GatewayQuerySet)): # type: ignore [misc]
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def get_queryset(self) -> QuerySet:
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return super().get_queryset().can_be_used()
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