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class CourseActivity < ApplicationRecord
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belongs_to :course_act, polymorphic: true
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belongs_to :course
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belongs_to :user
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belongs_to :exercise
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belongs_to :poll
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after_create :add_course_lead
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# 发布新课导语
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# 导语要放置在课程创建信息之后
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def add_course_lead
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# 避免空数据迁移报错问题
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if self.course_act_type == "Course"
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sample = PlatformSample.where(:samples_type => "courseGuide").first
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if sample.present? && sample.contents.present?
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content = sample.contents
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elsif Message.find(12440)
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lead_message = Message.find(12440)
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content = lead_message.content
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end
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if content
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# message的status状态为0为正常，为1表示创建课程时发送的message
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# author_id 默认为课程使者创建
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message = Message.create(subject: "新课导语",
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board_id: course.course_board.try(:id),
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author_id: 1,
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sticky: true,
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status: true,
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message_detail_attributes: {content: content}
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)
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# 更新的目的是为了排序，因为该条动态的时间可能与课程创建的动态创建时间一致
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message.course_acts.first.update_attribute(:updated_at, message.course_acts.first.updated_at + 1) if message.course_acts.first
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end
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end
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end
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end
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