Controllers/Variants

// app/controllers/post_controller/postcontroller.go
package postcontroller

func (c *PostsController) Show(post *Post) error {
	if post.Featured {
		c.Variants("featured")
	}
	c.Set("post", post)
	return nil
}

# app/views/posts/show.html.tpl
# app/views/posts/show.html+featured.tpl
# app/views/posts/_card.html.tpl
# app/views/posts/_card.html+featured.tpl