Collection helpers automatically sets up a transformation on your collections using Meteor's Mongo.Collection transform option, allowing for simple models with an interface that's similar to template helpers.
$ meteor add dburles:collection-helpersWrite your helpers somewhere seen by both client and server.
Books = new Mongo.Collection('books');
Authors = new Mongo.Collection('authors');
Books.helpers({
author() {
return Authors.findOne(this.authorId);
}
});
Authors.helpers({
fullName() {
return `${this.firstName} ${this.lastName}`;
},
books() {
return Books.find({ authorId: this._id });
}
});This will then allow you to do:
Books.findOne().author().firstName; // Charles
Books.findOne().author().fullName(); // Charles Darwin
Authors.findOne().books()Our relationships are resolved by the collection helper, avoiding unnecessary template helpers. So we can simply write:
Template.books.helpers({
books() {
return Books.find();
}
});...with the corresponding template:
<template name="books">
<ul>
{{#each books}}
<li>{{name}} by {{author.fullName}}</li>
{{/each}}
</ul>
</template>You can also apply helpers to the Meteor.users collection
Meteor.users.helpers({
// ...
});Sometimes it may be useful to apply the transformation directly to an object.
var doc = {
firstName: 'Charles',
lastName: 'Darwin'
};
var transformedDoc = Authors._transform(doc);
transformedDoc.fullName(); // Charles DarwinMIT
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