@register.inclusion_tag('catalogue/preview_ad_homepage.html', takes_context=True)
def preview_ad_homepage(context):
book = Book.objects.filter(parent=None, preview=True).first()
@register.inclusion_tag('catalogue/preview_ad_homepage.html', takes_context=True)
def preview_ad_homepage(context):
book = Book.objects.filter(parent=None, preview=True).first()