Association helpers in Meteor.

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Now we can attach helpers to documents, we can define a helper that fetches related documents

Lists.helpers({
  todos() {
    return Todos.find({listId: this._id}, {sort: {createdAt: -1}});
  }
});

Now we can find all the todos for a list :

const list = Lists.findOne();
console.log(`The first list has ${list.todos().count()} todos`);