socialforge/app/models/course_message.rb

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class CourseMessage < ActiveRecord::Base
# status说明 status在课程不同的类型区分不同的功能 status = 9 作品的提交记录
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# ApplyResource status:
# 0: 发送申请 1回复允许申请 2拒绝申请消息
# HomeworkCommonstatus
# nil发布了作业 1作业截止时间到了提醒2:开启匿评; 3关闭匿评 4匿评开始失败 5申请引用作业, 6:申请结果
# apply_user_id: 申请者的用户id
attr_accessible :course_id, :course_message_id, :course_message_type, :user_id, :viewed, :content, :status, :apply_user_id, :apply_result
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# 多态 虚拟关联
belongs_to :course_message ,:polymorphic => true
belongs_to :course
belongs_to :user
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has_many :message_alls, :class_name => 'MessageAll',:as =>:message, :dependent => :destroy
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validates :user_id,presence: true
validates :course_id,presence: true
validates :course_message_id,presence: true
validates :course_message_type, presence: true
#validates_length_of :content, :maximum => 100
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after_create :add_user_message
def add_user_message
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#unless self.course_message_type == 'JoinCourseRequest'
if MessageAll.where("message_type = '#{self.class.to_s}' and message_id = '#{self.id}'").first.nil? && self.status != 9
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self.message_alls << MessageAll.new(:user_id => self.user_id)
end
#end
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end
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end