CODEWITHSUNDEEP
pythondjango
user2071812
user2071812

Reputation: 47

django change model form instance

Is there any easy way to change the instance of a Django model form after it's been initialised?

For example the following would pre-populate the form in a template with the contents currently in the db for the object with an id of 1:

form = exampleModelForm(instance = Model.objects.get(pk=1)

This will also save the relevant object when save() is called rather than create a new one.

Where this will create a new object and not pre-populate the form in the template:

form = exampleModelForm()

As I'm returning a blank form from a different method, I would then like to assign an instance to it after it's been created and amend the object so that it can be saved and the template is pre-populate with the values that exist in the db. I want something like this but what I've tried doesn't seem to work:

form = methodThatGetsForm(somearg)
form.instance = ExampleModel.objects.get(pk = getId(somearg))

Is there a simple function that I'm missing here?

Upvotes: 1

Views: 1881

Answers (1)

Furbeenator
Furbeenator

Reputation: 8285

I have NOT tested this, but I wonder if you can reinitialize a new form with the returned form data and the instance as the new object.

form = methodThatGetsForm(somearg)
new_form = ExampleModelForm(form.cleaned_data, instance=ExampleModel.objects.get(pk=getID(somearg)))
new_form.save()

If not, there should be a way to get the data as a dictionary of key/value pairs for the fields from the form returned, using it's ._meta data. I think if you send that dictionary to the form init it will assign those values to the instance object, just like sending it request.POST.

Upvotes: 2

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