Question

I have a model in Django that looks like this:

class Project(models.Model):
    name = models.CharField(max_length=140)
    parent = models.ForeignKey('self', blank=True, null=True)

The goal is to make a form for this model with select widget for the parent field that will represent the hierarchical structure of projects. I tried to redefine choices pairs for this field by sorting queryset and adding indent in front of the label for each choice. But when I make a list of pairs (project.id, project.name) for the form

class ProjectForm(ModelForm):
    def __init__(self, *args, **kwargs):
        super(ProjectForm, self).__init__(*args, **kwargs)
        ordered = []
        // ... making ordered list ...
        self.fields['parent'].choices = ordered

the default empty choice for this field gets lost. Does anyone know how to get it back?
Thanks in advance.

Answer 1

In __init__, add:

self.fields['parent'].choices = ordered
self.fields['parent'].choices.append('', u'None)