[FIXED] My custom Jinja template filter will not register or work?

Issue

I've created a custom filter but my Flask server is getting an internal error.

@app.template_filter('doSomething')
def doSomething(input):
    print(input)
    return input

HTML

<p>{{ doSomething('Test') }}</p>

Error

jinja2.exceptions.UndefinedError: 'doSomething' is undefined

Solution

After some searching, trial and error, this is the only one that seems to work for me:

def doSomething(input):
    print(input)
    return input

app.jinja_env.globals.update(doSomething=doSomething)

Answered By - Ari