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POMeteor - MongoDB Error: Cannot apply $addToSet modifier to non-array
 

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    <p>I am following the recently published book "<a href="http://amzn.com/1782160825" rel="nofollow noreferrer">Getting Started with Meteor.js JavaScript Framework</a>" by Isaac Strack. The book works with Meteor 0.5.0. I am working with version 0.5.4.</p> <p>In the book you build an app with a few categories to which you insert data for tracking household items, and who they may be lent to. I deployed the app to a <a href="http://lendlib.meteor.com/" rel="nofollow noreferrer">meteor subdomain</a>, and it is working perfectly. It does not replicate my local MongoDB error.</p> <p><img src="https://i.stack.imgur.com/b1KcK.png" alt="LendLib"></p> <p>I am in Chapter 5, and I have just removed autopublish from the app, and specified my local channels for data.</p> <p>Locally, under the under the "Tools" category only, when I try to add a new item to the category, I recieve this error in my browser console:</p> <pre><code>Exception while simulating the effect of invoking '/Lists/update' Error {} Error: Cannot apply $addToSet modifier to non-array at Error (&lt;anonymous&gt;) at LocalCollection._modifiers.$addToSet (http://localhost:3000/packages/minimongo/modify.js?e7f02f0df0bff9f0b97236f9548637b7ede1ac74:178:13) at Function.LocalCollection._modify (http://localhost:3000/packages/minimongo/modify.js?e7f02f0df0bff9f0b97236f9548637b7ede1ac74:53:9) at LocalCollection._modifyAndNotify (http://localhost:3000/packages/minimongo/minimongo.js?7f5131f0f3d86c8269a6e6db0e2467e28eff6422:474:19) at LocalCollection.update (http://localhost:3000/packages/minimongo/minimongo.js?7f5131f0f3d86c8269a6e6db0e2467e28eff6422:444:12) at m.(anonymous function) (http://localhost:3000/packages/mongo-livedata/collection.js?3ef9efcb8726ddf54f58384b2d8f226aaec8fd53:415:36) at http://localhost:3000/packages/livedata/livedata_connection.js?367884963b120d457819216ff713b2586b266dde:540:25 at _.extend.withValue (http://localhost:3000/packages/meteor/dynamics_browser.js?46b8d1f1158040fcc2beb7906ec2f932871a398d:21:19) at _.extend.apply (http://localhost:3000/packages/livedata/livedata_connection.js?367884963b120d457819216ff713b2586b266dde:539:47) at Meteor.Collection.(anonymous function) [as update] (http://localhost:3000/packages/mongo-livedata/collection.js?3ef9efcb8726ddf54f58384b2d8f226aaec8fd53:266:23) logging.js:30 update failed: Internal server error logging.js:30 </code></pre> <p>The tools category already has one item in it which was submitted earlier in the tutorial. If I type into the console <code>lists.findOne({Category:"Tools"});</code> I get the output which recognizes an item in the Object:</p> <pre><code>Object Category: "Tools" _id: "eaa681e1-83f2-49f2-a42b-c6d84e526270" items: Object LentTo: "Steve" Name: "Linear Compression Wrench" Owner: "me" __proto__: Object __proto__: Object </code></pre> <p>However, the screen output is blank:</p> <p><img src="https://i.stack.imgur.com/SMDGd.png" alt="enter image description here"></p> <p>Naturally I have tried restarting the meteor server &amp; shut down the browser, but no resolution. I am new to MongoDB, so I am unclear as to where to turn to understand what is causing this problem, or why.</p> <p>You can <a href="http://lendlib.meteor.com/" rel="nofollow noreferrer">view the app here</a>. You can view the code on my <a href="https://github.com/stat30fbliss/LendLib" rel="nofollow noreferrer">GitHub</a>.</p>
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    1. COis it only tools that does this? Could you try running `meteor reset` (please backup all your stuff itll clear the database) and see if it still happens? I feel its the database because when you deploy to meteor.com it uses a fresh db
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    2. CO@Akshat That did the trick, thank you! And yes, it was only 'Tools' that was not cooperating.
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    3. COYou probably added it before in the tutorials manually but the items bit with the wrong kind of array (associative I suspect, using curly brackets {} instead of straight ones [])
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