How to lookup the current context in Nunjucks?

问题

In Handlebars you can use this to look up the current context.

How do you do the same in Nunjucks?

For example, if you wanted to dump the entire context as a JSON string:

<script>window.__config__ = {{ this | dump | safe }};</script>

(But this doesn't seem to work in Nunjucks.)

回答1:

If you need context then you can add global function

var env = nunjucks.configure([...
...
env.addGlobal('getContext', function() { 
    return this.ctx;
})

And dump her result in template

{{ getContext() | dump| safe }}

回答2:

I don't think you the variable this is available on a nunjucks template, but if it's another you wish to inspect you can use the dump method.

{{ users | dump }}

So that will print the json object, which looks really ugly if you have autoscape on.

{{ users | dump | safe }}

this will work just fine

ALTERNATIVELY:

env.addFilter('pprint', function(str, count) {
    return JSON.stringify(str, null, 4);
});

{{ users | pprint | safe }}

来源：https://stackoverflow.com/questions/38726828/how-to-lookup-the-current-context-in-nunjucks