Rails Chartkick Lines not drawing in multi-series line_chart

Question

Why are the lines not connecting the dots on my chart? I know the last array item has no data but I don't think that's the problem.

[1] pry(#<#<Class:0x007fb1936e6828>>)> result
[ 
[0] {
        :name => "Positive Room Pressure",
        :data => {
        Thu, 12 Jun 2014 16:25:28 UTC +00:00 => true,
        Mon, 16 Jun 2014 19:27:21 UTC +00:00 => true,
        Tue, 01 Jul 2014 08:58:40 UTC +00:00 => true,
        Mon, 07 Jul 2014 19:21:42 UTC +00:00 => true,
        Wed, 23 Jul 2014 20:43:23 UTC +00:00 => true,
        Wed, 23 Jul 2014 21:05:04 UTC +00:00 => true,
        Fri, 25 Jul 2014 05:24:18 UTC +00:00 => false,
        Mon, 25 Aug 2014 13:29:40 UTC +00:00 => true
    },
    :discrete => true
},
[1] {
        :name => "Room Humidity",
        :data => {
        Fri, 16 May 2014 12:13:07 UTC +00:00 => 65.0,
        Tue, 10 Jun 2014 19:27:53 UTC +00:00 => 64.0,
        Wed, 11 Jun 2014 15:45:17 UTC +00:00 => 65.0,
        Thu, 12 Jun 2014 16:25:27 UTC +00:00 => 25.0,
        Mon, 16 Jun 2014 19:27:22 UTC +00:00 => 66.0,
        Mon, 16 Jun 2014 20:35:34 UTC +00:00 => 97.0,
        Tue, 01 Jul 2014 08:58:46 UTC +00:00 => 70.0,
        Mon, 07 Jul 2014 19:22:25 UTC +00:00 => 52.0,
        Wed, 23 Jul 2014 21:05:18 UTC +00:00 => 65.0,
        Mon, 25 Aug 2014 13:29:32 UTC +00:00 => 0.3
    },
    :discrete => true
},
[2] {
        :name => "Ambient Temperature",
        :data => {
        Fri, 16 May 2014 12:13:10 UTC +00:00 => 33.0,
        Tue, 10 Jun 2014 19:28:05 UTC +00:00 => 32.5,
        Wed, 11 Jun 2014 15:45:25 UTC +00:00 => 33.0,
        Thu, 12 Jun 2014 16:25:40 UTC +00:00 => 34.0,
        Mon, 16 Jun 2014 19:27:23 UTC +00:00 => 26.0,
        Tue, 01 Jul 2014 08:58:51 UTC +00:00 => 25.0,
        Mon, 07 Jul 2014 19:22:33 UTC +00:00 => 34.0,
        Wed, 23 Jul 2014 21:05:29 UTC +00:00 => 23.0,
        Tue, 12 Aug 2014 22:39:31 UTC +00:00 => 41.0,
        Mon, 25 Aug 2014 13:29:31 UTC +00:00 => 23.0
    },
    :discrete => true
},
[3] {
        :name => "smell",
        :data => {},
    :discrete => true
}

]

![my test chart][1]

[1]: https://i.sstatic.net/u4JkJ.jpgstrong text

ERB to generate chart looks like:

Answer 1

As previous answers have mentioned, this seems to be due to the data points not sharing x-axis values. However, Highcharts handles such irregular data just fine, and it's supported by chartkick. Just source Highcharts (and jQuery as a dependency) instead of Google charts, e.g.

<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="path/to/chartkick.js"></script>

For a demo, check out: http://www.highcharts.com/demo/spline-irregular-time