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PORails 3: Creating compact array for highcharts includes nil, but shouldn't
 

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  1. PORails 3: Creating compact array for highcharts includes nil, but shouldn't
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    <p>I'm using Rails 3 and the Highcharts JS Library for creating charts. And the setup works just fine. The only problem is that my data array also includes nil-data. But let me show you the code first. The following snippet defines the data for my Highchart. </p> <pre><code>data: &lt;%= (30.days.ago.to_date..Date.today).map { |date| Health.total_on_weight(current_user.id, date).to_f}.compact %&gt; </code></pre> <p>"Health" is the model and "total_on_weight" is a method which is defined in that model:</p> <pre><code>def self.total_on_weight(id, date) where("user_id = ?", id).where("date(date) = ?",date).average(:weight) unless self.nil? end </code></pre> <p>As you can see I already tried to create an array which contains only existing data. If there isn't an entry in my database for the date, it shouldn't be in the array, but as a matter of fact, it is.</p> <p>I already tried do delete those entrys with the "compact" method and the "unless" method in my function. But there seems to be another problem which I can't wrap my head around.</p> <p>If anybody could explain to me why the nil-entries are still in my array or would have an sollution I would be very thankful.</p> <p>OK, I narrowed the problem down:</p> <p>If i leave the "to_f" in the function, as it now is, compact can't erase the missing values because they are not nil, but 0. And the array looks like this:</p> <pre><code>[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0, 100.0, 100.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 90.0] </code></pre> <p>Then, if I leave out the "to_f", the "compact" function can succesfully delete the missing values, which gives me an array like this:</p> <pre><code>[100.0, 100.0, 100.0, 90.0] </code></pre> <p>But the downside of this is, that Highcharts doesn't has the right dates for my values anymore. It displays them right as I wanted, but the dates just don't make any sense.</p> <p>UPDATE:</p> <p>I managed to fix the problem on my own. The data is now defined by:</p> <pre><code>data: [ &lt;% @weights = Health.where("user_id = ?", current_user.id) %&gt; &lt;% @weights.each do |weight| %&gt; &lt;%= "[Date.UTC(" + weight.date.year.to_s + ", " + ( weight.date.month - 1 ).to_s + ", " + weight.date.day.to_s + ")" + ", " + weight.weight.to_f.round(2).to_s + " ],"%&gt; &lt;% end %&gt; ] </code></pre> <p>This definitely does the trick.</p>
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    1. USThomas
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    1. COCould you share the output of `(30.days.ago.to_date..Date.today).map { |date| Health.total_on_weight(current_user.id, date).to_f}`?
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      1. USjibiel
    2. COI added the arrays above.
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      1. USThomas
    3. COK. I suppose you can answer to yourself and mark question as answered.
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      1. USjibiel
 

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