Make the prepopulated slug field as readonly in Django Admin

Question

I want to make the slug field as read_only depending on the other field value like "lock_slug".

Means There will be Two conditions.

1) When value of "lock_slug" is false then the slug field directly prepopulated from the field "title".

prepopulated_fields = {"slug": ("title",),}

2) When value of "lock_slug" is true then the slug field make as readonly.

def get_readonly_fields(self, request, obj = None):
    if obj and obj.lock_slug == True:
        return ('slug',) + self.readonly_fields        
    return self.readonly_fields

These two works fine independently, but problematic when used both.

Means when I try to add get_readonly_fields() on edit then it gives error because of prepopulated_fields.These two crashes with each other.

There will be any solution for working both on admin side.

I also refer below links

Making a field readonly in Django Admin, based on another field's value

django admin make a field read-only when modifying obj but required when adding new obj

But not working these two at the same time.

Thanks,

Meenakshi

Answer 1

Here is another way:

class PostAdmin(admin.ModelAdmin):
    list_display = (
        'title',
        'slug',
    )
    prepopulated_fields = {'slug': ('title',)}

    def get_readonly_fields(self, request, obj=None):
        if obj:
            self.prepopulated_fields = {}
            return self.readonly_fields + ('slug',)
        return self.readonly_fields

Answer 2

As @Rexford pointed out, the most voted answer doesn't work for recent django versions, since you can't make readonly a prepopulated field.

By the way, you can still get what you want, just override also the get_prepopulated_fields method using the same logic, i.e:

class PageAdmin(admin.ModelAdmin):
    prepopulated_fields = {
        'slug': ('title', ),
    }


    def get_readonly_fields(self, request, obj=None):
        readonly_fields = super().get_readonly_fields(request, obj)
        if request.user.is_superuser:
            return readonly_fields
        return list(readonly_fields) + ['slug', ]

    def get_prepopulated_fields(self, request, obj=None):
        prepopulated_fields = super().get_prepopulated_fields(request, obj)
        if request.user.is_superuser:
            return prepopulated_fields
        else:
            return {}