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class Exercise < ActiveRecord::Base
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#exercise_status: 1,新建；2，发布；3，关闭
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include Redmine::SafeAttributes
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belongs_to :user
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belongs_to :course ,:touch => true
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belongs_to :exercise_bank
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has_many :exercise_group_settings, :dependent => :destroy
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has_many :exercise_questions, :dependent => :destroy,:order => "#{ExerciseQuestion.table_name}.question_number"
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has_many :exercise_users, :dependent => :destroy, :conditions => "exercise_users.is_delete = 0"
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has_many :score_exercise_users, :conditions => "exercise_users.is_delete = 0 and commit_status != 0", :order => "exercise_users.score desc"
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has_many :users, :through => :exercise_users #该测试被哪些用户提交答案过
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has_many :course_acts, :class_name => 'CourseActivity',:as =>:course_act ,:dependent => :destroy
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# 课程消息
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has_many :tidings, as: :container, dependent: :destroy
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has_many :course_messages, :class_name =>'CourseMessage', :as => :course_message, :dependent => :destroy
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after_create :acts_as_course_message
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def acts_as_course_message
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if self.course
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if self.exercise_status == 2 #未发布
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#self.course.members.each do |m|
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self.course_messages << CourseMessage.create(:user_id => User.current.id, :course_id => self.course_id, :viewed => false,:status=>2)
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#end
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# else
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# self.course_messages.destroy_all 这里的destory_all值得商榷。因为我这里是通过status来控制不同的status的
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end
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end
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end
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end
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