Databases
StackOverflow2013
Postsdbo
POcursor.find() callbacks not returning in meteorjs
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POcursor.find() callbacks not returning in meteorjs
    primarykey
    data
    text
    <p>I am returning results from a collection with the second result dependent on the first. So, I find resultA, and resultB has to be anything not equal to result A. </p> <p>My console.log statement shows the data that I want, however, when I return it, nothing shows up in my handlebars template. Nothing returns even if I JSON.stringify it. </p> <pre><code>myCollection.find({}, {limit:1, skip: _.random(minimum, maximum)}).forEach(function(a){ myCollection.find({'': {$ne: a._id}}, {limit:1}).forEach(function(b){ console.log({resultA: a, resultB: b}) return {resultA: a, resultB: b}; }); }); </code></pre> <p>What am I doing wrong here? </p> <p>Now I have tried using deps.autorun just incase the collections aren't ready (which they are because console.log always works)</p> <pre><code>Template.votes.helpers({ twoItems: function(){ var minimum = 0; Deps.autorun(function(){ var maximum = (Items.find().fetch().length) - 1; if (maximum){ var itemA = Items.find({}, {limit:1, skip: _.random(minimum, maximum)}).fetch()[0]; } if(itemA){ console.log(itemA); var itemB = Items.find({'': {$ne: itemA._id}}, {limit:1}).fetch()[0]; } if (itemB) { data = {itemA:itemA, itemB:itemB}; console.log(data); return data; } }); },}); </code></pre> <p>with a simple template:</p> <pre><code>&lt;template name="votes"&gt; &lt;p&gt;Test&lt;/p&gt; &lt;hr&gt; {{twoItems}} &lt;hr&gt;&lt;/template&gt; </code></pre> <p>At the very least it should return Object but nothing. Console.log always returns the correct data but nothing shows up in the rendered handlebars templates. </p> <p>Edit: I ended up having to use the following:</p> <pre><code> twoItems: function(){ var minimum = 0; var maximum = (Items.find().fetch().length) - 1; var itemA = Items.find({}, {limit:1, skip: _.random(minimum, maximum)}).forEach(function(a){ Session.set('itemAid', a._id); }); var itemA = Items.find({'_id': Session.get('itemAid')}).fetch()[0]; var itemB = Items.find({'_id': {$ne: Session.get('itemAid')}}, {limit:1,skip: _.random(minimum, maximum - 1)}).fetch()[0]; return {itemA: itemA, itemB: itemB}; }, </code></pre> <p>I still don't know why call backs aren't able to return anything. In the docs it says </p> <blockquote> <p>If you include a callback function as the last argument [In a Meteor.Call] (which can't be an argument to the method, since functions aren't serializable), the method will run asynchronously: it will return nothing in particular and will not throw an exception.</p> </blockquote> <p>So I'm assuming that since a collection operation is a meteor call as well, then that is why the returns are being ignored.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USgarg
    1. USgarg
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COpost the code of handlebars
      singulars
      1. POcursor.find() callbacks not returning in meteorjs
      1. USsohel khalifa
    2. CORight, the error is most likely in Handlebars.
      singulars
      1. POcursor.find() callbacks not returning in meteorjs
      1. USHubert OG
    3. COThanks for the responses. I just have {{twoItems}} in the handlebars. I also had tried {{#each twoItems}}{{this}}{{/each}}. The odd thing however, is that if I place the return statement _outside_ of the forEach (or map) call back, then it returns and the sample data shows up. But nothing inside the find callbacks get returned. But I know that the code within the callback gets executed because all my console.log() statements get executed inside the foreach and/or map callbacks.
      singulars
      1. POcursor.find() callbacks not returning in meteorjs
      1. USgarg
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload