Question

Given an admin media class that sets up a rich text editor, like:

class TutorialAdmin(admin.ModelAdmin):

    fields...

    class Media:
        js = ['/paths/to/tinymce.js',]

I would like the ability to selectively override js depending on a field value in the model it references. I’ve added a “use_editor” boolean to the Tutorial model. The question is, how can I detect whether the current instance has that bool set? I’d like to end up with something like:

class Media:
    if self.use_editor:
        js = ['/path/to/tinymce.js',]
    else:
        js = ''

Ideas? Thanks.

Answer 1

Many thanks to Sam Lai on django-users, I finally have a working solution for this. Turns out to be trickier than expected because you can’t directly access field values on the instance from within the Admin class – you need to do it by redefining the form used by the Admin class. In addition, you’ll need to use _media rather than “class Media:” to set the media property.

The goal is to detect the current instance value of the use_visual_editor field and turn javascript paths on or off depending on its value (so authors can turn off the visual editor on a per-record basis). Here’s the final working solution:

models.py

class Tutorial(models.Model):
    use_visual_editor = models.BooleanField()

forms.py

from django import forms
from tutorials.models import Tutorial

class TutorialAdminForm(forms.ModelForm):
    class Meta:
        model = Tutorial

    def _media(self):
        if self.instance.use_visual_editor == True:
            js = ['/paths/to/javascript',] 
        else:
            js = ['']
        return forms.Media(js=js)

    media = property(_media)

admin.py

from django import forms
....
class TutorialAdmin(admin.ModelAdmin):
    form = TutorialAdminForm

Works perfectly!