socialforge/app/models/journals_for_message.rb

# fq
# 数据库字段中带有m前缀和is_readed是二次开发添加，之前的字段基本复用
# 注意reply_id 是提到人的id，不是留言id, Base中叫做 at_user
class JournalsForMessage < ActiveRecord::Base
  include Redmine::SafeAttributes
  safe_attributes   "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)
  acts_as_tree :foreign_key => 'm_parent_id', :counter_cache => :m_reply_count, :order => "#{JournalsForMessage.table_name}.created_on ASC"

  belongs_to :jour, :polymorphic => true
  belongs_to :user
  belongs_to :at_user, :class_name => "User", :foreign_key => 'reply_id' 

  has_many :acts, :class_name => 'Activity', :as => :act, :dependent => :destroy

  validates :notes, presence: true
  after_create :act_as_activity #huang
  after_create :reset_counters!
  after_destroy :reset_counters!

  # default_scope { where('m_parent_id IS NULL') }

  def remove_by_user? user
    if(  self.user == user || 
       ( self.jour.kind_of?(User) && self.jour== user )
      )
      true
    else
      false
    end
  end
  
  def self.delete_message(message_id)
    self.find(message_id).destroy
    # self.destroy_all "id = #{message_id}"
  end
  
  def reference_user
    User.find(reply_id)
  end
  
  def self.reference_message(user_id)
    @user = User.find(user_id)
    message = JournalsForMessage.find_by_sql("select * from journals_for_messages where reply_id = #{@user.id} or (jour_type = 'Bid' and jour_id in (select id from bids where author_id = #{@user.id}))")
    message 
  end
  
  def act_as_activity
    if self.jour_type == 'Principal' 
      unless self.user_id == self.jour.id &&  self.user_id != self.reply_id && self.reply_id != 0        
        self.acts << Activity.new(:user_id => self.user_id)        
      end    
    end
  end

  def reset_counters!
    self.class.reset_counters!(self)
  end
  def self.reset_counters! journals_for_messages
    # jfm_id = journals_for_messages.id.to_i
    count = find_all_by_m_parent_id(journals_for_messages.m_parent_id).count #(SELECT COUNT(*) FROM #{JournalsForMessage.table_name} WHERE m_parent_id = #{jfm_id} )
    update_all("m_reply_count = #{count.to_i}", ["id = ?", journals_for_messages.m_parent_id])
  end
end