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class JournalsForMessage < ApplicationRecord
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belongs_to :jour, :polymorphic => true
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belongs_to :user
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belongs_to :parent, class_name: "JournalsForMessage", foreign_key: "m_parent_id",
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counter_cache: :m_reply_count, optional: true
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has_many :praise_treads, as: :praise_tread_object, dependent: :destroy
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#scope :children, -> {where(m_parent_id: self.id).includes(:user).reorder("created_on asc")}
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#scope :children, -> (discuss_id){ where(parent_id: discuss_id).includes(:user).reorder("created_at asc") }
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scope :parent_comment, -> { where(m_parent_id: nil)}
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scope :search_by_jour_type, lambda{|type,ids| where(jour_type:type,jour_id: ids)}
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# "jour_type", # 留言所属类型
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# "jour_id", # 留言所属类型的id
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# "notes", # 留言内容
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# "reply_id", # 留言被回复留言者的用户id(用户a回复了用户b，这是b的id，用以查询谁给b留言了)
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# "status", # 留言是否被查看(弃用)
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# "user_id", # 留言者的id
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# "m_parent_id", # 留言信息的父留言id
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# "is_readed", # 留言是否已读
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# "m_reply_count", # 留言的回复数量
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# "m_reply_id" , # 回复某留言的留言id(a留言回复了b留言，这是b留言的id)
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# "is_comprehensive_evaluation", # 1 教师评论、2 匿评、3 留言
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# "hidden", 隐藏
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# course_identity 课堂用户身份
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def contents_show course_identity
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if self.hidden && course_identity >= Course::STUDENT
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nil
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else
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self.notes
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end
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end
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def can_delete course_identity
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course_identity < Course::STUDENT
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end
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def created_at
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self.created_on
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end
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def children page, limit
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JournalsForMessage.includes(:user).where(m_parent_id: self.id).page(page).per(limit).reorder("created_on asc")
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end
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end
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