Estimated Time to Complete: 5 minutes
To create each chart, you will populate the chart's encoding channels with fields from your schema. Encoding channels represent the information passed to MongoDB Charts which allows Charts to create the visualization.
To discover which directors of films represented in this dataset have
won the most awards, use the
fields in your chart. The
genres field provides additional
insight into the specific genres of the films for which these directors have won awards.
A column chart makes it easy to sort and compare fields with numerical values, so it is a good choice for this use case.
directorsfield from the Fields section of the Chart Builder view to the X Axis encoding channel.
directorsArray Reductions dropdown, select Unwind Array.
In the Fields section click the
awardsfield to expand the
awardsobject and view its properties.
awards.winsfield to the Y Axis encoding channel. The Y Axis encoding channel determines which field to use for the chart's aggregation.
Leave the Aggregate dropdown menu for the Y Axis encoding channel on its default value of sum. This value directs the aggregation operation to return the total number of award wins for each director.
Aggregation processes data records
using a wide variety of methods and returns computed results
which may not be available in the original dataset. Because we
are interested in the total number of awards won by each
director, we use the
awards.wins field here and will use
an aggregation operator which will allow us to add up the
total wins for each director.
At this point there are too many columns in our X axis to show any meaningful results. To bring the number down to a manageable level, we'll apply a limit to get the ten directors with the most award wins.
directors array is already sorted by the aggregated value
wins in descending order. To apply a limit to the number
of columns in the X Axis:
Toggle Limit Results to On.
Set Show to
genresfield to the Series encoding channel.
In the Array Reductions dropdown menu, select
unwind array. The X axis columns are now broken down by movie genre.
Some movies contain more than one genre, so the numbers shown in the columns may not be the exact number of awards for each director.
Hover over your chart title above the center of the chart and click the pencil icon.
Copy the following into the chart title input:
Directors with Most Awards, Split by Genre
Click the check mark to save your title.
Your chart should now look like this:
Click Save and Close to return to your dashboard.
Follow along to the next section of the tutorial to build a scatter chart of award-nominated movies and their respective TomatoMeter ratings.