render jinja2 template without a Flask context

Question

I have a Flask application that calls flask.render_template without problems when it is invoked from a flask http request.

I need the same method to work outside of flask (from a python back end program)

resolved_template =  render_template(template_relative_path, **kwargs)

I could use the jinja2 api, but I would like the same method to work, in both contexts (flask and command line)

Answer 1

If you want to completely bypass flask and use purely Jinja for rendering your template, you can do as such

import jinja2

def render_jinja_html(template_loc,file_name,**context):

    return jinja2.Environment(
        loader=jinja2.FileSystemLoader(template_loc+'/')
    ).get_template(file_name).render(context)

And then you can call this function to render your html

Answer 2

You need to render it in an app context. Import your app in your backend code and do the following.

with app.app_context():
    data = render_template(path, **context)