How to update multiple fields of a django model instance?

Question

I'm wondering, what is a standard way of updating multiple fields of an instance of a model in django? ... If I have a model with some fields, ``` Class foomodel(models.Model): field1 = models.CharField(max_length=10) field2 = models.CharField(max_length=10) field3 = models.CharField(max_length=10) ... ``` ... and I instantiate it with one field given, and then in a separate step I want to provide the rest of the fields, how do I do that by just passing a dictionary or key value params? Possible? In other words, say I have a dictionary with some data in it that has everything I want to write into an instance of that model. The model instance has been instantiated in a separate step and let's say it hasn't been persisted yet. I can say `foo_instance.field1 = my_data_dict['field1']` for each field, but something tells me there should be a way of calling a method on the model instance where I just pass all of the field-value pairs at once and it updates them. Something like `foo_instance…

Accepted Answer

It's tempting to mess with `__dict__`, but that won't apply to attributes inherited from a parent class.

You can either iterate over the dict to assign to the object:

```
for (key, value) in my_data_dict.items():
    setattr(obj, key, value)
obj.save()
```

Or you can directly modify it from a queryset (making sure your query set only returns the object you're interested in):

```
FooModel.objects.filter(whatever="anything").update(**my_data_dict)
```

How to update multiple fields of a django model instance?

Solution

Problem