23 lines
825 B
Ruby
23 lines
825 B
Ruby
class CourseMessage < ActiveRecord::Base
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attr_accessible :course_id, :course_message_id, :course_message_type, :user_id, :viewed, :content, :status
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# 多态 虚拟关联
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belongs_to :course_message ,:polymorphic => true
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belongs_to :course
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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
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validates :course_id,presence: true
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validates :course_message_id,presence: true
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validates :course_message_type, presence: true
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validates_length_of :content, :maximum => 100
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after_create :add_user_message
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def add_user_message
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if MessageAll.where("message_type = '#{self.class.to_s}' and message_id = '#{self.id}'").first.nil?
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self.message_alls << MessageAll.new(:user_id => self.user_id)
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end
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end
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end
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