I have to models. Employee and locations . the association between them is location has many employees. and employee belongs to location. i want to draw a pie chart between this 2 models. means i want to show all locations and employees count of that location in pie chart. how can i do that?
i was trying to implement this using the Chartkick gem.
but do not know how to draw the graph between them.
Try gruff or rchar both should work in your case.
In order to have piechart by using Chartkick gem we can use the method
pie_chart *argument
*argument is nothing but a hash with count of each key values
in your case you can do something like this
pie_chart Location.includes(:employees).collect{|loc| {"#{loc.name}".to_sym => loc.employees.size}}.reduce Hash.new, :merge
it will return a hash with keys like "location name" and values to respective keys will be the employees count
