"eval" statement in Jinja2 template

Question

I'm trying to convert some old Smarty templates to Jinja2.

Smarty uses an eval statement in the templates to render a templated string from the current context.

Is there an eval equivalent in Jinja2 ? Or what is a good workaround for this case ?

Answer 1

Use the @jinja2.contextfilter decorator to make a Custom Filter for rendering variables:

from flask import render_template_string
from jinja2 import contextfilter
from markupsafe import Markup


@contextfilter
def dangerous_render(context, value):
    Markup(render_template_string(value, **context)).format()

Then in your template.html file:

{{ myvar|dangerous_render }}