Django MultiValueField - django

Question

I'm struggling with some Django, where I want to make a custom MultiValueField combined with MultiWidget. I've read misc. tutorials, but it seem I'm missing something - most of them were quite old, which I suspect could be the reason.
I'm using Django 1.10.
Goal: Make a custom field that provides three dropdowns for a form. So far, no requirements to the contents of the dropdowns - first I just want to see them in my form :-)
I have a fields.py file, containing:
from django import forms
from widgets import MyCustomWidget
class MyCustomField(forms.MultiValueField):
widget = MyCustomWidget
def __init__(self, *args, **kwargs):
fields = (
forms.CharField(max_length=31),
forms.CharField(max_length=31),
forms.CharField(max_length=31),
)
super(MyCustomField, self).__init__(fields, *args, **kwargs)
def compress(self, data_list):
return "-".join(data_list)
And then there's a widgets.py, containing:
import re
from django import forms
class MyCustomWidget(forms.MultiWidget):
def __init__(self, attrs=None):
widgets = (
forms.widgets.Select(attrs=attrs, choices=[("1", "1")]),
forms.widgets.Select(attrs=attrs, choices=[("2", "2")]),
forms.widgets.Select(attrs=attrs, choices=[("3", "3")]),
)
super(MyCustomWidget, self).__init__(widgets, attrs)
def decompress(self, value):
if value:
return re.split(r"\-", value)
return [None, None, None]
forms.py:
from django.forms import ModelForm
from django import forms
class MyCustomForm(forms.ModelForm):
class Meta:
model = MyCustomModel
fields = ("name")
name = forms.CharField(widget=MyCustomField)
This works fine when migrating, but I try to view the form, I get this error:
'MyCustomField' object has no attribute 'is_hidden'
I have tried to implement this attribute in MyCustomField, but then I get another error:
'MyCustomField' object has no attribute 'attrs'
These attributes should be provided by forms.MultiValueField, as far as I understand - thus I shouldn't need to write them myself.
In the template, I'm just using "{{ form }}" as I wan't to use Django's default layout.
I'm going nuts here and hope someone is able to help to the right path :-)
Kind regards,
Kasper

Answer 1

I believe your mistake is on the line where you set the name
name = forms.CharField(widget=MyCustomField). I haven't tested the codes thou.
from django.forms import ModelForm
from django import forms
class MyCustomForm(forms.ModelForm):
class Meta:
model = MyCustomModel
fields = ("name")
name = MyCustomField # This I believe is will fix your error