Meteor, display/sort value by boolean

Question

I'm working on a table in Meteor template, where the is a boolean field "emergency" I would like to display in the table the cells where there is the "emergency" flag FIRST, and then the others ...

How can I do that please ?

here is the find, I tried to sort(), find and sort inside but It doesn't work .. :/

Template.actionsList.helpers({
    actions: function() {
        return Actions.find();
    }
});

Thanks in advance :)

---

I get the error: Exception in template helper: TypeError: Cannot read property 'hasOwnProperty' of null

My code is:

Session.set('emergency', false);
Template.actionForm.onRendered(function () {
    var $elem = this.$('.emergency');
    $elem.checkbox('set ' + (Session.get('emergency') ? 'checked' : 'unchecked'));
    $elem.checkbox({
            onChange: function () {
              Session.set('emergency', !Session.get('emergency'));
            }
    });
});

Template.actionForm.events({
    'submit .new-action': function(event) {
        event.preventDefault();

        var emergency = Session.get('emergency');
    ...
       Actions.insert({
        emergency: emergency
    ....

Thanks for the help

Answer 1

Use underscore's sortBy() method to sort on objects checking if the 'emergency' field exists via the hasOwnProperty() native method:

Template.actionsList.helpers({
    actions: function() {
        var actions = Actions.find().fetch();
        return _.sortBy(actions, function (a) { return !a.hasOwnProperty('emergency'); });
    }
});

Check the demo below.

 var actions = [ { "_id" : "ukn9MLo3hRYEpCCty", "field" : "foo" }, { "_id" : "ukn9MLo3hRYEpCCty", "field" : "bar", "emergency": true }, { "_id" : "WMHWxeymY4ATWLXjz", "field" : "abc", "emergency": false }, { "_id" : "5SXRXraariyhRQACe", "field" : "xyz" } ]; var result = _.sortBy(actions, function (a) { return !a.hasOwnProperty('emergency'); }); pre.innerHTML = JSON.stringify(result, undefined, 4); 

 <script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.7.0/underscore-min.js"></script> <pre id="pre"></pre>