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  1. PO
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    <p>I don't know about db_objects, when I try and access that property on a cursor (which is what <code>find()</code> returns), it's <code>null</code>.</p> <p>You could fetch the items that matches your query instead, and then do your iteration:</p> <pre><code>Template.content.categories_parents = function (){ var parents = Categories.find({idCategoryParent:0}).fetch(); // Returns an array. for (var i = 0; i &lt; parents.length; i++){ var pId = parents[i]['idCategory']; var children = Categories.find({idCategoryParent:pId}); // No need for array here, cursor is fine. parents.db_objects[i]['children'] = children; } return parents; } </code></pre> <p>I'm new at this myself, so maybe there's a more efficient way of doing it, but I don't know it currently.</p> <p><strong>Update after Eric's comment.</strong></p> <p><strong>The js file looks like this:</strong></p> <pre><code>Categories = new Meteor.Collection("categories"); if (Meteor.isClient) { Template.categories.categories = function () { var parents = Categories.find({idCategoryParent:0}).fetch(); for (var i = 0; i &lt; parents.length; i += 1) { var pId = parents[i]['idCategory']; var children = Categories.find({idCategoryParent:pId}); parents[i]['children'] = children; } return parents; }; } if (Meteor.isServer) { Meteor.startup(function () { Categories.remove({}); var data = [ {idCategoryParent: 0, idCategory: 1, label: "Movies"}, {idCategoryParent: 1, idCategory: 0, label: "Science Fiction"}, {idCategoryParent: 1, idCategory: 0, label: "Drama"}, {idCategoryParent: 0, idCategory: 2, label: "Music"}, {idCategoryParent: 2, idCategory: 0, label: "Jazz"}, {idCategoryParent: 2, idCategory: 0, label: "Piano"} ]; for (var i = 0; i &lt; data.length; i += 1) { Categories.insert(data[i]); } }); } </code></pre> <p><strong>The html file looks like this:</strong></p> <pre><code>&lt;head&gt; &lt;title&gt;nested_template&lt;/title&gt; &lt;/head&gt; &lt;body&gt; {{&gt; categories}} &lt;/body&gt; &lt;template name="categories"&gt; &lt;h1&gt;Categories&lt;/h1&gt; {{#each categories}} &lt;b&gt;{{label}}&lt;/b&gt; &lt;ul&gt; {{#each children}} &lt;li&gt;{{label}}&lt;/li&gt; {{/each}} &lt;/ul&gt; {{/each}} &lt;/template&gt; </code></pre> <p>It works just fine for me.</p>
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    1. POHow to render nested collections in Meteor?
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    1. COThanks for giving it a shot. Unfortunately it did not work for me.
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    2. COI updated my answer to include complete contents of files.
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    3. COI was originally attempting to force a 'children' array onto the parent category objects, and your code allowed me to do that by getting actual arrays (i was mistakenly trying to force children onto the cursor itself). I will have to test out your updated solution and see how updating and synching works with it (i.e. Whether all open tabs are correctly updated in realtime when a new child category is added to the system)
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