19 lines
774 B
Python
19 lines
774 B
Python
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from django.db import models
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import uuid
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class Sensor(models.Model):
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uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
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area_code = models.CharField(max_length=10)
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def __str__(self):
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return f"Sensor {self.uuid} in Area {self.area_code}"
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class SensorData(models.Model):
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sensor = models.ForeignKey(Sensor, on_delete=models.CASCADE, related_name='data', null=True) # 暂时允许 null
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parameter_type = models.CharField(max_length=20, default='moisture') # 提供默认值
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value = models.DecimalField(max_digits=10, decimal_places=2)
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timestamp = models.DateTimeField(auto_now_add=True)
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def __str__(self):
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return f"Data from Sensor {self.sensor.uuid if self.sensor else 'N/A'} at {self.timestamp}"
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