educoder/app/controllers/praise_tread_controller.rb

class PraiseTreadController < ApplicationController
  include MessagesHelper
  before_action :require_login
  before_action :validate_params, only: [:like, :unlike]
  before_action :find_object

  def like
    begin
      return normal_status(2, "你已点过赞了") if by_user_liked?(@obj, current_user)
      @praise_tread = @obj.praise_treads.build(user_id: current_user.id)
      @praise_tread.save!
    rescue Exception => e
      uid_logger_error(e.message)
      tip_exception(e.message)
      raise ActiveRecord::Rollback
    end
  end

  def unlike
    begin
      return normal_status(2, "你还没有点过赞噢") unless by_user_liked?(@obj, current_user)
      @praise_treads = @obj.praise_treads.user_liker(current_user)
      @praise_treads.last.destroy! if @praise_treads.present?
    rescue Exception => e
      uid_logger_error(e.message)
      tip_exception(e.message)
      raise ActiveRecord::Rollback
    end
  end

  private
  def find_object
    begin
      @obj = params[:object_type].strip.classify.constantize.find params[:object_id]
    rescue Exception => e
      uid_logger_error(e.message)
      tip_exception(e.message)
      return
    end
  end

  def validate_params
    return normal_status(2, "缺少参数：object_id") if params[:object_id].blank?
    return normal_status(2, "缺少参数：object_type") if params[:object_type].blank?
  end
end