Passing values to form when initializing in views django?

Question

forms.py

class PermissionForm(forms.Form):
    def __init__(self, *args, **kwargs):
        self.rolesChoices = kwargs.pop('rolesChoices')
        super(PermissionForm, self).__init__(*args, **kwargs)
        print(self.rolesChoices)
        self.fields['roles'].queryset = self.rolesChoices
        print(self.fields['roles'].queryset)
    roles = forms.ModelChoiceField(
        queryset=None, widget=forms.CheckboxSelectMultiple, empty_label=None)

views.py

def privileges(request):
    rolesChoices = Permission.objects.filter(
        content_type=ContentType.objects.get_for_model(Group))
    for role in rolesChoices:
        role.name = role.name.replace("group", "role")
    form = PermissionForm(rolesChoices=rolesChoices)
    return render(request, 'crm/privileges.html', {'form': form})

I am passing group objects to my form when I am initializing it in views.But I am done a small change, I replaced group with role.So the problem is role get changed with group automatically.I don't know why it's happenging.

For example self.roleChoices contains Can add role When I assign self.roleChoices to self.fields['roles'].queryset it changes to Can add group

Antoine Pinsard · Accepted Answer · 2020-11-06 16:00:25Z

The problem is that, when you do the following:

    for role in rolesChoices:
        role.name = role.name.replace("group", "role")

You execute the queryset, which creates a list of results cached in the queryset.

Then, when you do:

self.fields['roles'].queryset = self.rolesChoices

You actually call self.fields['roles']._set_queryset(self.rolesChoices) as queryset is a property that ensures calling .all() on your queryset.

If you need to operate such changes on the results before showing it in your form, I would recommend to use a ChoiceField instead of a ModelChoiceField. Thus you can set the choices attribute as you wish.

However, in this case you might be able to bypass the property using _queryset: self.fields['roles']._queryset = self.rolesChoices. Although you might face other issues later if the queryset is called again with .all() or .filter().

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