socialforge/app/models/student_work.rb

#学生提交作品表
class StudentWork < ActiveRecord::Base
  attr_accessible :name, :description, :homework_common_id, :user_id, :final_score, :teacher_score, :student_score, :teaching_asistant_score, :project_id

  belongs_to :homework_common
  belongs_to :user
  has_many :student_works_evaluation_distributions, :dependent => :destroy
  has_many :student_works_scores, :dependent => :destroy
  belongs_to :project
  has_many :student_work_tests, order: 'id desc'

  before_destroy :delete_praise

  acts_as_attachable

  def delete_praise
    PraiseTread.where("praise_tread_object_id = #{self.id} AND praise_tread_object_type = 'StudentWork'").destroy_all
  end
end