from django.db import models
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# Create your models here.
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class SensorType(models.Model):
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name = models.CharField(max_length=30)
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unit = models.CharField(max_length=10)
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def __str__(self):
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return self.name
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class Sensor(models.Model):
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sensor_type = models.ForeignKey(SensorType, on_delete=models.CASCADE)
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name = models.CharField(max_length=30)
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def __str__(self):
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return self.name
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class Measurement(models.Model):
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sensor_id = models.ForeignKey(Sensor, on_delete=models.CASCADE)
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value = models.FloatField()
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timestamp = models.DateTimeField(auto_now_add=True)
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def __str__(self):
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return "{} {} {} {}".format(self.sensor_id, self.value, self.sensor_id.sensor_type.unit, self.timestamp)
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