socialforge/app/controllers/praise_tread_controller.rb

class PraiseTreadController < ApplicationController
  def praise_plus
    @obj = nil
    if request.get?
      @obj_id = params[:obj_id]
      @obj_type = params[:obj_type]
      @obj = praise_tread_plus(@obj_type,@obj_id,1)
    end
  end

  def praise_minus
    @obj = nil
    if request.get?
      @obj = params[:obj]  # 传的是对象，最后变成id了

      #首先更新praise_tread 表 删除关注记录
      @pt = PraiseTread.find_by_user_id_and_praise_tread_object_id_and_praise_tread_object_type(User.current.id,@obj,"user")
      @pt.delete

      #再更新praise_tread_cache表 使相应的记录减1 当为0时删除
      @ptc = PraiseTreadCache.find_by_object_id(@obj)
      @ptc.minus(1)
      if @ptc.praise_num == 0
      @ptc.delete
      end

    end
    @obj = User.find_by_id(@obj)
    respond_to do |format|
      format.html
      format.js
    end
  end

  def tread_plus
    @obj = nil
    if request.get?
      @obj_id = params[:obj_id]
      @obj_type = params[:obj_type]
      @obj = praise_tread_plus(@obj_type,@obj_id,0)
    end
  end

  def tread_minus
    respond_to do |format|
      format.html
      format.js
    end
  end

  private

  def find_object_by_type_and_id(type,id)
    @obj = nil
    case type
    when 'User'
      @obj = User.find_by_id(id)
    when 'Issue'
      @obj = Issue.find_by_id(id)
    when 'Project'
      @obj = Project.find_by_id(id)
    when 'Bid'
      @obj = Bid.find_by_id(id)
    end
    return @obj
  end

  def praise_tread_plus(type,id,flag)
    unless id.nil? and type.nil?
      #首先创建或更新praise_tread 表
      @pt = PraiseTread.new
      @pt.user_id = User.current.id
      @pt.praise_tread_object_id = id.to_i
      @pt.praise_tread_object_type = type
      @pt.praise_or_tread = flag
      @pt.save
      # end

      #再创建或更新praise_tread_cache表
      @ptc = PraiseTreadCache.find_by_object_id_and_object_type(id,type)
      @ptc = @ptc.nil? ? PraiseTreadCache.new : @ptc
    @ptc.object_id = id.to_i
    @ptc.object_type = type
    @ptc.save
    @ptc.plus(1)
    end

    @obj = find_object_by_type_and_id(type,id)
    
    respond_to do |format|
      format.html
      format.js
    end
  end

end