Is it possible to override values inside a Model? I am getting 'MyModel' object does not support item assignment.
my_model = MyModel.objects.get(id=1)
print my_model.title
if my_model.is_changed:
my_model['title'] = 'something' # 'MyModel' object does not support item assignment
params = {
'my_model': my_model,
...
}
return render(request, 'template.html', params)
Models are objects, not dictionaries. Set attributes on them directly:
if my_model.is_changed:
my_model.title = 'something'
Or, if the attribute name is dynamic, use setattr
:
attr_name = 'title' # in practice this would be more complex
if my_model.is_changed:
setattr(my_model, attr_name, 'something')
This changes the in-memory copy of the model, but makes no database changes - for that your attribute would have to be a field and you'd have the call the save
method on my_model
. You don't need to do that if you just want to change what the template receives in its context, but just for completeness's sake:
if my_model.is_changed:
my_model.title = 'something'
my_model.save()
Dictionaries are mutable, if you actually have a dictionary:
mydict = {'title': 'foo'}
# legal
mydict['title'] = 'something'
But not everything is a dictionary.
Yes, you can change values, but this is not how its done. Django Models are Python classes that have models to represent fields. For example a CharField
is for holding a string in a database. Let me demonstrate (code from django docs):
from django.db import models
class Person(models.Model):
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=30)
As you can see above the Python class is a custom Django model. It is linked to a databse, and when you run manage.py syncdb
, it will interact with your database to create the tables and columns that you need it to.
Now, in your case:
if my_model.is_changed:
my_model.title = "Something"
my_model.save()
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