Django Admin - Overriding the widget of a custom form field

Question

I have a custom TagField form field.

class TagField(forms.CharField):     def __init__(self, *args, **kwargs):         super(TagField, self).__init__(*args, **kwargs)         self.widget = forms.TextInput(attrs={'class':'tag_field'}) 

As seen above, it uses a TextInput form field widget. But in admin I would like it to be displayed using Textarea widget. For this, there is formfield_overrides hook but it does not work for this case.

The admin declaration is:

class ProductAdmin(admin.ModelAdmin):     ...     formfield_overrides = {         TagField: {'widget': admin.widgets.AdminTextareaWidget},     } 

This has no effect on the form field widget and tags are still rendered with a TextInput widget.

Any help is much appreciated.

--
omat

Answer 1

The django admin uses custom widgets for many of its fields. The way to override fields is to create a Form for use with the ModelAdmin object.

# forms.py  from django import forms from django.contrib import admin  class ProductAdminForm(forms.ModelForm):     def __init__(self, *args, **kwargs):         super(ProductAdminForm, self).__init__(*args, **kwargs)         self.fields['tags'].widget = admin.widgets.AdminTextareaWidget() 

Then, in your ModelAdmin object, you specify the form:

from django.contrib import admin from models import Product from forms import ProductAdminForm  class ProductAdmin(admin.ModelAdmin):     form = ProductAdminForm  admin.site.register(Product, ProductAdmin) 

You can also override the queryset at this time: to filter objects according to another field in the model, for instance (since limit_choices_to cannot handle this)