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class CourseActivity < ApplicationRecord
belongs_to :course_act , polymorphic : true
belongs_to :course
belongs_to :user
belongs_to :exercise
belongs_to :poll
after_create :add_course_lead
# 发布新课导语
# 导语要放置在课程创建信息之后
def add_course_lead
# 避免空数据迁移报错问题
if self . course_act_type == " Course "
sample = PlatformSample . where ( :samples_type = > " courseGuide " ) . first
if sample . present? && sample . contents . present?
content = sample . contents
elsif Message . find ( 12440 )
lead_message = Message . find ( 12440 )
content = lead_message . content
end
if content
# message的status状态为0为正常，
# author_id 默认为课程使者创建
message = Message . create ( subject : " 新课导语 " ,
board_id : course . course_board . try ( :id ) ,
author_id : 1 ,
sticky : true ,
status : true ,
message_detail_attributes : { content : content }
)
# 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
message . course_acts . first . update_attribute ( :updated_at , message . course_acts . first . updated_at + 1 ) if message . course_acts . first
end
end
end
end
