Call function from Dust template - node.js

Question

I'm developing a simple web site where I need to retrieve a list of objects from a database. I wanted to try nodejs so, after days of reading and tests, I finally decided to use this configuration:
Server technology: Nodejs + Express
Template engine: Dust
Database/Data source: Parse
I wired all these stuff and it seems working well, but I have now the first problem: I need to call a function from a Dust template, this is the code:
{>layout/}
{<content}
<ul>
{#photos}
<li>{photo.get("name")}{~n}</li>
{/photos}
</ul>
{/content}
but it doesn't work because it prints out {photo.get("name")} (literally) instead of printing the name of each photo. The query with Parse works correctly as I can see the loaded objects via console.log().
I'm new both with nodejs and dust so I'm not sure the problem is related only to dust. Any idea?

Answer 1

I have no any other solution except creation of a helper:
var dust = require('dustjs-linkedin');
dust.helpers.exec = function(chunk, context, bodies, params) {
var args = JSON.parse(params.args.replace(/'/g, '"'));
var object = context.stack.head;
params.func.split('.').some(function(property) {
if (typeof(object[property]) === "function") {
var result = object[property].apply(object, args);
chunk.write(result);
return true;
} else {
object = object[property];
return false;
}
})
return chunk;
};
Suppose we have following data:
app.get('/dust-test', function(req, res) {
function Photo(name) {
var props = {'name': name};
this.get = function(prop) {
return props[prop];
}
}
var photos = ['foo', 'bar', 'nanana'].map(function(name) {
return new Photo(name);
})
res.render("dust-test", {
photo: new Photo('me'),
photos: photos
});
});
Usage:
<li>{#exec func="photo.get" args="['name']" /}</li>
{#photo}
<li>{#exec func="get" args="['name']" /}</li>
{/photo}
<ul>
{#photos}
<li>{#exec func="get" args="['name']" /}{~n}</li>
{/photos}
</ul>
Where args - is an array of arguments in json format (single quotes are used)