class JournalsForMessage < ApplicationRecord
  belongs_to :jour, :polymorphic => true
  belongs_to :user
  belongs_to :parent, class_name: "JournalsForMessage", foreign_key: "m_parent_id",
             counter_cache: :m_reply_count, optional: true

  has_many :praise_treads, as: :praise_tread_object, dependent: :destroy

  #scope :children, -> {where(m_parent_id: self.id).includes(:user).reorder("created_on asc")}
  #scope :children, -> (discuss_id){ where(parent_id: discuss_id).includes(:user).reorder("created_at asc") }

  scope :parent_comment, -> { where(m_parent_id: nil)}
  scope :search_by_jour_type, lambda{|type,ids| where(jour_type:type,jour_id: ids)}

  # "jour_type", # 留言所属类型
  # "jour_id", # 留言所属类型的id
  # "notes", # 留言内容
  # "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)
  # "status", # 留言是否被查看(弃用)
  # "user_id", # 留言者的id
  # "m_parent_id", # 留言信息的父留言id
  # "is_readed", # 留言是否已读
  # "m_reply_count", # 留言的回复数量
  # "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)
  # "is_comprehensive_evaluation",  # 1 教师评论、2 匿评、3 留言
  # "hidden", 隐藏


  # course_identity 课堂用户身份
  def contents_show course_identity
    if self.hidden && course_identity >= Course::STUDENT
      nil
    else
      self.notes
    end
  end

  def can_delete course_identity
    course_identity < Course::STUDENT
  end

  def created_at
    self.created_on
  end

  def children page, limit
    JournalsForMessage.includes(:user).where(m_parent_id: self.id).page(page).per(limit).reorder("created_on asc")
  end

end