How to use a lookup table in Jinja?

Question

In my Jinja template I have a list of tuples like this one:

{% set typeLabels = [
    ('type1', 'Label for type 1'),
    ('type2', 'Label for type 2'),
    ('type3', 'Label for type 3')
] %}

I use a list and not a dict because the order is important (I also use the list elsewhere to generate a listbox).

Then I need to do lookups like this one:

{{ dict(typeLabels)[someType] }}

which works fine if you do it inside Python, but in Jinja it doesn't work.

How can I do this in Jinja?

Answer 1

Well, since there's no answers I'll post my solution based on the suggestions.

First you have to add collections.OrderedDict to the Jinja environment since Jinja doesn't know about it:

JINJA_ENV = jinja2.Environment( . . . )
JINJA_ENV.globals['OrderedDict'] = collections.OrderedDict

And then in the template:

{% set typeLabels = OrderedDict([
    ('type1', 'Label for type 1'),
    ('type2', 'Label for type 2'),
    ('type3', 'Label for type 3')
]) %}

So now you can access the dictionary normally:

{{ typeLabels[someType] }}