Counter Caches and HABTM

course.rb

class Course < ActiveRecord::Base
  belongs_to :department, counter_cache: true
  has_many :sections
  has_many :professors, -> { uniq }, through: :sections
  has_many :course_attributes
  has_many :cattributes, through: :course_attributes, class_name: "Attribute"

  validates :department, presence: true
end

Professor Sections Reset

[5] pry(main)> Professor.reset_counters(4, :sections)
  Professor Load (1.1ms)  SELECT  "professors".* FROM "professors"  WHERE "professors"."id" = $1 LIMIT 1  [["id", 4]]
   (0.4ms)  SELECT COUNT(*) FROM "sections"  WHERE "sections"."professor_id" = $1  [["professor_id", 4]]
   (0.7ms)  UPDATE "professors" SET "courses_count" = 12 WHERE "professors"."id" = 4
=> true

# Notice how it is updating the Courses Count, when I want this to be sections_count updated. :/

professor.rb

class Professor < ActiveRecord::Base
  #include ActiveModel::Serialization
  has_many :section_professors
  has_many :sections
  has_many :courses, -> { uniq }, :through => :sections

  def after_save
    update_counter_cache
  end

  def after_destroy
    update_counter_cache
  end

  def update_counter_cache
    #self.courses_count = self.courses.count
    Professor.update_counters(self.id, :courses_count => self.courses.count)
    self.save!
  end
  #counter_culture [:course]
  #counter_culture [:section]
end

section.rb

class Section < ActiveRecord::Base
  belongs_to :course, counter_cache: true

  # Setup Professor Sections Counter
  belongs_to :professor, counter_cache: true

  def after_save
    self.update_counter_cache
  end

  def after_destroy
    self.update_counter_cache
  end

  def update_counter_cache
    self.professor.update_counter_cache
    self.save!
  end
end