title: How to update fields in a model without creating a new record in django?
body: <p>I have a model in django that I want to update only, that is, when I call it and set the data, it will not create a new record, only update the existing one. How can I do this? Here is what I have:</p>
  
  <pre><code>class TemperatureData(models.Model):   
      date = models.DateTimeField()   
      value = models.PositiveIntegerField()   
      alert = models.BooleanField()
  </code></pre>