Django list display of foreign key attribute that is boolean field using check or cross icons

Question

My problem is similar to this thread: Can "list_display" in a Django ModelAdmin display attributes of ForeignKey fields?. I want to display a foreign key attribute from the list display. This attribute is a BooleanField. Normally, it would display a check or cross if the admin page is on the model itself containing the field. Such as this:

However when I reference this to other admin page.

class ProofOfPaymentAdmin(admin.ModelAdmin):
    list_display = ('id', 'reference_number', 'user', 'is_subscribed',)

    def is_subscribed(self, obj):
        return obj.user.is_subscribed

The return from the list display is the boolean values True or False.

How can I change this to display the icons check or cross similar from the above?

Update 1: Result from first answer:

Answer 1

You can use format_html() method to return HTML code for displaying the checkmark or cross icon based on the Boolean value, following is an example:

from django.utils.html import format_html

class ProofOfPaymentAdmin(admin.ModelAdmin):
    list_display = ('id', 'reference_number', 'user', 'is_subscribed',)
    
    def is_subscribed(self, obj):
        if obj.user.is_subscribed:
            return format_html('<span style="color:green">&#x2714;</span>') 
        else:
            return format_html('<span style="color:red">&#x2718;</span>') 
    is_subscribed.short_description = 'Subscribed?' # Set the column header

This will display a green checkmark icon for True values and a red cross icon for False values. The format_html method ensures that the HTML code is properly escaped to prevent any security vulnerabilities.