How to test for a List in Jinja2?

Question

As far as I can see, there is no way to test if an object is a List instance in Jinja2.

Is that correct and has anyone implemented a custom test/extensio

Answer 1

You can easily do this whit a custom filter in jinja2.

First create you test method:

def is_list(value):
    return isinstance(value, list)

And add it as an custom filter:

j = jinja2.Jinja2(app)
j.environment.filters.update({
        'is_list': is_list,
})