如何在Handlebars.js的循环中比较两个属性，其中一个属性在循环范围之外？

Question

I'm using Handlebars.js to display an element depending on whether a string matches the current user's username.

I'm actually looping through a collection blogs and this is where the attribute author comes into play. Regardless, author.username represents some username string and this is available to me. My problem is that if I change user.attributes.username to some pre-defined string, ie "martin" then the condition checks out and it displays the element the way I want. But I also have an attribute user.attributes.username and this renders just fine outside the #ifEquals condition. I really want to compare author.username with this attribute, and not some pre-defined string.

How can I compare two attributes, ie author.username with user.attributes.username instead of author.username with "martin" ?

Both author.username and user.attributes.username have the same value. This doesn't work for me right now but is what I ultimately want:

{{#each blog}}
        {{#ifEquals author.username user.attributes.username}}
            <a href="#" onClick="return false;"><span class="delete-container" style="cursor: pointer" data-blog-id="{{objectId}}"><span class="typcn typcn-arrow-sorted-down hvr-pulse-grow" style="color: gray; font-size: 30px;"></span></span></a>
        {{/ifEquals}}
{{/each}}

This works but isn't sufficient for my purposes:

{{#each blog}}
        {{#ifEquals author.username "martin"}}
            <a href="#" onClick="return false;"><span class="delete-container" style="cursor: pointer" data-blog-id="{{objectId}}"><span class="typcn typcn-arrow-sorted-down hvr-pulse-grow" style="color: gray; font-size: 30px;"></span></span></a>
        {{/ifEquals}}
{{/each}}

Handlebars.js Helper:

<script>
    Handlebars.registerHelper('ifEquals', function(arg1, arg2, options) {
        return (arg1 == arg2) ? options.fn(this) : options.inverse(this);
    });
</script>

Edit: Upon further inspection, it looks like the problem is that user.attributes.username won't render inside the blog loop. It thinks user is an attribute of blog . Is there any way to access user as if it were outside the scope of the loop?

Answer 1

Apparently you can access outer-loop attributes in Handlebars.js by appending ../

{{currentUser.username}} // Renders fine outside the loop

 {{#each blog}}
    // Append ../ to access currentUser inside the loop
    {{#ifEquals author.username ../currentUser.username}}
        // Show element here
    {{/ifEquals}}
 {{/each}}

../user is an attribute that comes from outside the blog loop, whereas author belongs to blog .