Custom template pipe fuctions in Tornado

Question

How do you define a custom template pipe function that is available on all template in Tornado.

Trying to achieve something like this:

{{ name | transform_me }}

Answer 1

You can pass custom ui_methods with Application, that will be available in all templates:

import tornado.ioloop
import tornado.web


class MyHandler(tornado.web.RequestHandler):
    def get(self):
        self.render("mytemplate.html")


def my_custom_function(handler, *args):
    # handler is the RequestHandler of current handled request  
    # args are the agrs passed through template
    return 'my_custom {}'.format(str(args)) 

if __name__ == "__main__":
    application = tornado.web.Application(
        [(r"/", MyHandler),],
        # expose function to the templates
        ui_methods={'my_custom_function': my_custom_function}
    )
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

and template file

{{ my_custom_function('adsadasda', 'qweqweq') }}