How to display string which contains django template variables?

Question

Let's say I have an string variable called *magic_string* which value is set to "This product name is {{ product.name }}" and it's avaible at django template. Is it ever possible to parse that variable to show me "This product name is Samsung GT-8500" instead (assuming that name of the product is "GT-8500" and variable {{ product.name }} is avaible at the same template) ?

I was trying to do something like this, but it doesn't work (honestly ? Im not surprised):

{{ magic_string|safe }}

Any ideas/suggestions about my problem ?

alex vasi · Accepted Answer · 2011-11-16 08:21:02Z

7

Write custom template tag and render that variable as a template. For example look at how "ssi" tag is written.

On the other hand, can you render this string in your view? Anyway here is an untested version of that tag:

@register.tag
def render_string(parser, token):
    bits = token.contents.split()
    if len(bits) != 2:
        raise TemplateSyntaxError("...")
    return RenderStringNode(bits[1])


class RenderStringNode(Node):
    def __init__(self, varname):
        self.varname = varname

    def render(self, context):
        var = context.get(self.varname, "")
        return Template(var).render(context)

edited Nov 16, 2011 at 8:21

answered Nov 16, 2011 at 8:11

alex vasi

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2 Comments

Kamil Rykowski Over a year ago

Works like a charm. Thank you ! Sorry for not upvoting, but I need some more reputation to do that :(

Stu Cox Over a year ago

If you want to use attributes of context variables (e.g. person.name) chuck from django.template.base import resolve_variable in the top, then change the 2nd to last line to var = resolve_variable(self.varname, context).

pvilas · Accepted Answer · 2011-11-16 09:10:31Z

6

Perhaps I dont understand your question but what about,

from django.template import Context, Template
>>> t = Template("This product name is {{ product.name }}")

>>> c = Context({"product.name": " Samsung GT-8500"})
>>> t.render(c)

Regards.

answered Nov 16, 2011 at 9:10

pvilas

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1 Comment

Kamil Rykowski Over a year ago

So we're even, coz I dont understand the answer :) But anyway thanks for sharing !

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