34 lines
1.5 KiB
Python
34 lines
1.5 KiB
Python
from django.db import models
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from mainapp.models import Satellite, Polarization, get_default_polarization
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from django.db.models import F, ExpressionWrapper
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from django.db.models.functions import Abs
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class Transponders(models.Model):
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name = models.CharField(max_length=30, null=True, blank=True, verbose_name="Название транспондера")
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downlink = models.FloatField(blank=True, null=True, verbose_name="Downlink")
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frequency_range = models.FloatField(blank=True, null=True, verbose_name="Полоса")
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uplink = models.FloatField(blank=True, null=True, verbose_name="Uplink")
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zone_name = models.CharField(max_length=255, blank=True, null=True, verbose_name="Название зоны")
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polarization = models.ForeignKey(
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Polarization, default=get_default_polarization, on_delete=models.SET_DEFAULT, related_name="tran_polarizations", null=True, blank=True, verbose_name="Поляризация"
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)
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sat_id = models.ForeignKey(Satellite, on_delete=models.PROTECT, related_name="tran_satellite", verbose_name="Спутник")
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transfer =models.GeneratedField(
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expression=ExpressionWrapper(
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Abs(F('downlink') - F('uplink')),
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output_field=models.FloatField()
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),
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output_field=models.FloatField(),
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db_persist=True,
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null=True, blank=True, verbose_name="Перенос"
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)
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def __str__(self):
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return self.name
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class Meta:
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verbose_name = "Транспондер"
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verbose_name_plural = "Транспондеры"
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