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POMeteor exception in Meteor.flush when updating a collection breaks reactivity across clients
 

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  1. POMeteor exception in Meteor.flush when updating a collection breaks reactivity across clients
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    <p>When I'm calling Collection.update from the front end (the method call is allowed), the update does work ok, but the exception below is being thrown (in Chrome's JS console, not in the server). Although the update took place, other clients connected to the same collection do not see the updates until they refresh the browser - I suspect because of the exception. </p> <p>Any idea what might cause this? </p> <pre><code>Exception from Meteor.flush: Error: Can't create second landmark in same branch at Object.Spark.createLandmark (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1085:13) at http://checkadoo.com/packages/templating/deftemplate.js?7f4bb363e9e340dbaaea8d74ac670af40ac82d0a:115:26 at Object.Spark.labelBranch (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1030:14) at Object.partial [as list_item] (http://checkadoo.com/packages/templating/deftemplate.js?7f4bb363e9e340dbaaea8d74ac670af40ac82d0a:114:24) at http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:349:48 at Object.Spark.labelBranch (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1030:14) at branch (http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:308:20) at http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:348:20 at Array.forEach (native) at Function._.each._.forEach (http://checkadoo.com/packages/underscore/underscore.js?772b2587aa2fa345fb760eff9ebe5acd97937243:76:11) </code></pre> <p><strong>EDIT 2</strong></p> <p>The error will also occur if the update call is run in the console. It happens on the first run of the update but by then reactivity is broken on any other browser attached to it. </p> <p><strong>EDIT</strong> Here is my template for the clickable item that triggers the update:</p> <pre><code>&lt;template name="list_item"&gt; &lt;li class="checklistitemli"&gt; &lt;div class="{{checkbox_class}}" id="clitem_{{index}}"&gt; &lt;input type="checkbox" name="item_checked" value="1" id="clcheck_{{index}}" class="checklist_item_check" {{checkbox_ticked}}&gt; {{title}} &lt;/div&gt; &lt;/li&gt; &lt;/template&gt; </code></pre> <p>and here's the event handler for clicks on 'list_item':</p> <pre><code>Template.list_item.events = { 'click .checklistitem' : function(ev) { this.checked = !this.checked; var updateItem = {}; updateItem['items.'+this.index+'.checked'] = this.checked; console.log("The error happens here"); Lists.update({_id: this._id}, {$set:updateItem}, {multi:false} , function(err) { console.log("In callback, after the error"); }); } } </code></pre> <p>The whole thing is available at <a href="http://checkadoo.com" rel="nofollow">http://checkadoo.com</a> (Its a port of a Tornado based Python app of mine)</p>
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    1. COMaybe show us how you are rendering the collection that is being updated?
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    2. COAdded some code example.
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    3. COThere's a lot going on here; can you simply it down to something that displays the same error?
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