How to render a Jinja2 macro from a view callable?

Question

I have some macros defined that are called from several templates.

For example, the Product page has a Review section that uses the macros defined in 'helpers/review.jinja2' to print each review. The 'helpers/review.jinja2' file has this two macros:

{% macro render_review(request,review) -%}
{% macro render_review_comment(request,comment) -%}

When someone submits a new review, via ajax, I want to return the rendered review in order to append the content to the Review section.

Right now, I have an intermediate template 'review/review.jinja2' that looks like this:

{% import 'helpers/review.jinja2' as review_helper %}
{{ review_helper.render_review(request,review) }}

This template is rendered from the view:

@view_config(route_name='review.add_review', renderer='review/review.jinja2')
def add_review(request):
    return dict(review=my_new_review)

But I hope there is a better way to do this. So, is it possible to render a macro defined in a template?

Thanks

Answer 1

The solution can actually be found in another one of Armin's projects - Flask implements a get_template_attribute method (see here for the source of the method). This points us at Jinja2's Template class, more specifically, the Template class' module attribute.

I don't know if Pyramid's default renderer for Jinja2 exposes that functionality for you, but it should be possible to create and register a custom renderer if the default one does not let you do something like this (entirely theoretical):

@view_config(route_name='review.add_review',
                renderer='helpers/review.jinja2:render_review')
def add_review(request):
    return dict(review=my_new_review)