Python, Flask, and jinja templates - How to iterate over a dictionary created server side

Question

I am using flask.

On the server server when a page loads I create a dictionary.

@app.route('/edit_creative', methods=["GET", "POST"])
@login_required
def edit_creative():
    if request.method == "POST": 
        pass

    query = """select * from mystable"""
    print query
    rows = execute_query(query,select=True)
    creative_handler={}
    for row in rows:
        j = row[2].strip("'")
        j = json.loads(j)
        creative_handler[row[1]]=j

    return render_template("edit_creatives.html",title = 'Edit Creative')

On the client side I want to iterate over the hash:

{% for crid, object in creative_handler.iteritems() %}

{{ crid }}<br>

{% endfor %}

On the page I get this error

UndefinedError: 'creative_handler' is undefined

So..how do I use jinja templates to iterate over a hash creates server side?

Solution 1

You need to pass creative_handler to the template:

return render_template("edit_creatives.html", title='Edit Creative', creative_handler=creative_handler)

Solution 2

Well you need to pass in the variable(s) you want to use, in the template.

>>> from flask import render_template
>>> help(render_template)
render_template(template_name, **context)
    Renders a template from the template folder with the given
    context.

    :param template_name: the name of the template to be rendered
    :param context: the variables that should be available in the
                    context of the template.

so return render_template("edit_creatives.html",title = 'Edit Creative', creative_handler = creative_handler)