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ruby-on-railsrubydiagramgruff

Data in Gruff diagram from database

I was looking for some example how to extract data from database and use it in diagram created in Gruff, but failed. So I want to show in this diagram two things from data base:

Course.application.size - which would count all applications to this course

Student.size - which would show me how many students are in school

So, how should I put this data into following diagram?

g = Gruff::Pie.new

g.title = "Applications"
g.data("Applied", ???)
g.data("Students", ???)

send_data(g.to_blob, :disposition => 'inline', :type => 'image/png', :filename => "gruff.png")
Solution

  • Store the count in variable and use it as data in graph as shown below:

    @course = Course.application.size

    @student = Student.size

    g = Gruff::Pie.new
g.title = "Applications"
g.data : "Applied", @course
g.data : "Students", @student
send_data(g.to_blob, :disposition => 'inline', :type => 'image/png', :filename => "gruff.png")