socialforge/app/helpers/school_helper.rb

module SchoolHelper
  def schoolMember_num school
    count = UserExtensions.where("school_id = #{school.id} or occupation = '#{school.name}'").count
    count.to_s
  end

  def student_num school
    UserExtensions.find_by_sql("SELECT * FROM user_extensions WHERE occupation = '#{school.name}' AND identity = '1'").count
  end

  def teacher_num school
    UserExtensions.find_by_sql("SELECT * FROM user_extensions AS ue, schools AS s WHERE ue.school_id = s.id AND s.name = '#{school.name}' AND ue.identity = '0'").count
  end

end