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copied!<pre><code>function addItem(list_id, item_name) { if(!item_name && !list_id) return; lists.update({_id:list_id}, {$addToSet:{items:{Name:item_name}}}); } </code></pre> <p>Seems like you're trying to add an object to a set. You're getting an error on simulation. Let's investigate that error. The code that errors out:</p> <p><a href="https://github.com/meteor/meteor/blob/master/packages/minimongo/modify.js">https://github.com/meteor/meteor/blob/master/packages/minimongo/modify.js</a></p> <pre><code> $addToSet: function (target, field, arg) { var x = target[field]; if (x === undefined) target[field] = [arg]; else if (!(x instanceof Array)) throw Error("Cannot apply $addToSet modifier to non-array"); else { ... </code></pre> <p>Uh oh, <code>throw Error("Cannot apply $addToSet modifier to non-array.")</code>.</p> <p>Look at your code:</p> <pre><code>Object Category: "Tools" _id: "eaa681e1-83f2-49f2-a42b-c6d84e526270" ... items: Object ... </code></pre> <p><code>items</code> is an object, not an array! It will error out.</p> <p>Can you <code>$addToSet</code> to an object with Mongo? Let's look at the code.</p> <p><a href="https://github.com/mongodb/mongo/blob/4a4f9b1d6dc79d1ba4a7d7eaa9e4eb6d00aa466c/db/update.cpp">https://github.com/mongodb/mongo/blob/4a4f9b1d6dc79d1ba4a7d7eaa9e4eb6d00aa466c/db/update.cpp</a></p> <pre><code> case ADDTOSET: { uassert( 12592 , "$addToSet can only be applied to an array" , in.type() == Array ); ... } </code></pre> <p>Nope! This is from old Mongo code, because the contemporary codebase is sprawling, but same thing.</p> <p>I only found one <code>insert</code> in your code.</p> <pre><code>'keyup #add-category': function(e, t) { if (e.which === 13) { var catVal = String(e.target.value || ""); if (catVal) { lists.insert({Category:catVal}); Session.set('adding_category', false); } } }, </code></pre> <p>Try <code>lists.insert({Category:catVal,items:[]})</code>. So that items is initialized as an array rather than an object when it was first used.</p> <p>Also, I don't think <code>$addToSet</code> compares objects in an array the way you would like anyway, so consider making a separate collection <code>Items</code> that contains a <code>categoryId</code>.</p> <p>It is purely a coincidence that it is working on one place and not another.</p>

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