Django error object has no attribute 'update'

Question

UPDATE I was doing some maintenance on the server and rebooted... once it came back the code worked just fine... which actually makes me to worry just the same... i think it's a bug on mod_wsgi. Thanks anyway! I'm really new to django (started yesterday). I managed to make a excel parser using xlrd, everything works fine with the data (it loads really really fast), i need to update the file info in the database so i can know how the load is going, this is where i have the problem, the save() method doesn't work, I already used update along with get and filter, but always the same problem. I hope you can point me out where is the mistake models.py ``` class archivo(models.Model): archivo_id = models.AutoField(primary_key=True) fk_cliente = models.IntegerField() fk_usuario = models.IntegerField() archivo_nombre = models.CharField(max_length = 30) archivo_original = models.CharField(max_length = 255) archivo_extension = models.CharField(max_length = 5) archivo_tamano = models.FloatField(…

Accepted Answer

The reason for this error is that `.get()` returns an individual object and `.update()` will only operate on a QuerySet, such as what would be returned with `.filter()` instead of `.get()`.

If you are using `.get()`, then `.update()` will not work. You will need to save the information to the object manually:

```
archivo = archivo.objects.get(archivo_id=procesar)
archivo.archivo_registros = sh.nrows
archivo.save()
```

You can also use update_fields if you only wish to save this particular piece of data:

```
archivo = archivo.objects.get(archivo_id=procesar)
archivo.archivo_registros = sh.nrows
archivo.save(update_fields=['archivo_registros'])
```

This prevents triggering any signals that you may not want to invoke.

Your other option is to simply use `.filter()`.

```
archivo = archivo.objects.filter(archivo_id=procesar).update(archivo_registros=sh.nrows)
```

Note that this will update multiple objects if they exist. If you want to be sure that doesn't happen, you should include the primary key in the filter, or use one of the earlier approaches to make sure you are only modifying a single object.

Django error <model> object has no attribute 'update'

Solution

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