Migrating to FlowRouter, need something similar to a template data context - node.js

Question

So I've read a lot on the discussion of Iron Router vs FlowRouter.
I started my project using Iron Router, but since changed my mind and I'm currently migrating to FlowRouter.
Everything was going smoothly until I started migrating the comments section of my app. You see, this section is reused several times on the app, it serves as a comment section for news, posts, photos, videos, etc.
Example using IR's data context:
Router.route('/news/:slug', {
name: 'newsItem',
waitOn: function() { Meteor.subscribe('news.single', this.params.slug) },
data: function() {
return News.findOne({slug: this.params.slug});
}
});
<template name="newsItem">
<p>{{title}}</p>
<p>{{body}}</p>
{{> commentSection}}
</template>
The Comment collection schema has a "type" (to know to what type of "thing" this comment belongs to, news, photos, etc). That type was set on the "form .submit" event of commentSection template. Example:
'submit form': function(e, template) {
e.preventDefault();
var $body = $(e.target).find('[name=body]');
console.log(template.data.type);
var comment = {
type: template.data.type,
parentId: template.data._id,
parentSlug: template.data.slug,
body: $body.val()
};
Meteor.call('insertComment', comment, function(error, commentId) {
if (error){
alert(error.reason);
} else {
$body.val('');
}
});
}
This worked because the template data context contained the News item which in turn has a a type property as well.
How could I achieve something similar to this only using Flow Router without setting data on the template as it is recommended by the official guide?

Answer 1

You'll want to use a template subscription and a {{#with}} helper probably.
Template.newsItem.onCreated( function() {
Template.instance().subscribe('news.single', FlowRouter.current().params.slug);
});
Template.newsItem.helpers({
item() {
let item = News.findOne();
if( item ) {
return item;
}
}
});
<template name="newsItem">
{{#with item}}
<!-- Your existing stuff -->
{{/with}}
</template>