How do I return a list as a variable in Python and use in Jinja2?
Assuming you have a model such as:
class User(Document): email = TextField()You can use the static method load of the User class
users = [User.load(db, uid) for uid in db]Now you can do this:
for user in users: print user.id, user.email But you're using it in flask so, in your view you can send this list of users to your template using something like this:
from flask import render_template@app.route("/users")def show_users(): users = [User.load(db, uid) for uid in db] return render_template('users.html', users=users)Now in the users.html jinja2 template the following will output a dropdown listbox of each user's e-mail
<select>{% for user in users %} <option value="{{ user.id }}">{{ user.email }}</option>{% endfor %}</select>Also, are you using the Flask-CouchDB extension? It might be helpful in abstracting out some of the low level couchdb coding: http://packages.python.org/Flask-CouchDB/
Disclaimer: The code above wasn't tested, but should work fine. I don't know much about CouchDB, but I am familiar with Flask. Also, I obviously didn't include a full Flask/CouchDB application here, so bits of code are missing.
You pass parameters to a jinja template as a dictionary d when you call the template.renderfunction(d) function (for example). Thus, you could do:
emails = []for user in db: doc = db[user] emails.append(doc['email'])some_jinja_template.render({'list_of_emails' : emails})Then in the template, you could do something like:
<ul>{% for address in list_of_emails %} <li><a href="mailto:{{ address }}">Send email to {{ address }}</a></li>{% endfor %}</ul>To make a list of emails, for example, or handle them however you'd like.
PS - I'm sure the code could be more elegant/more optimized with a list comprehension or whatever, but I figured I should emphasize readability for a so-called "green" programmer.