Help EventCalendar

Rails
1

I am developing an application for days and times for school and I’m
using the gem EventCalendar, but I have a problem in time to paint the
day of the week for a particular discipline, the discipline
mathematics does not happen every day only on days Mon / Wed / Fri.
When creating a discipline I submit this:

class CreateDisciplines <ActiveRecord :: Migration

   def change  create_table: disciplines do | t |
         t.string: name
         t.integer: user_id
         t.boolean: monday
         t.boolean: thursday
         t.boolean: wednesday
         t.boolean: thursday
         t.boolean: friday
         t.time: hour_begin
         t.time: hour_end
   end
         t.timestamps
  end

end
end

class CreateEvents <ActiveRecord :: Migration

     def change   create_table: events do | t |
            t.integer: discipline_id
            t.date: start_at
            t.date: end_at
            t.boolean: all_day
            t.timestamps
       end
   end

end

You can tell me how do I create a method to paint only the day of the
week a particular discipline registered?

Thank you for help.