educoder/app/models/challenge.rb

class Challenge < ApplicationRecord
  # difficulty: 关卡难度: 1.简单 2.中等 3.困难
  default_scope { order("challenges.position asc") }

  belongs_to :shixun, :touch => true, counter_cache: true
  belongs_to :user
  has_many :challenge_samples, :dependent => :destroy
  has_many :test_sets, :dependent => :destroy
  has_many :challenge_tags, :dependent => :destroy
  has_many :games, :dependent => :destroy
  has_many :challenge_chooses, :dependent => :destroy
  has_many :homework_challenge_settings, :dependent => :destroy
  has_many :praise_tread, as: :praise_tread_object, dependent: :destroy
  has_one :praise_tread_cache, as: :object, dependent: :destroy
  has_many :tidings
  # 参考答案
  has_many :challenge_answers, :dependent => :destroy
  has_many :exercise_bank_shixun_challenges, :dependent => :destroy

  # acts_as_attachable

  scope :base_attrs, -> { select([:id, :subject, :position, :shixun_id, :st, :score, :path, :task_pass, :modify_time,
                                  :web_route, :answer]) }
  scope :choose_type, -> { where(st: 1) }
  scope :practice_type, -> { where(st: 0) }

  scope :fields_for_list, -> { select([:id, :subject, :st, :score, :position, :shixun_id]) }

  def next_challenge
    position = self.position + 1
    Challenge.where(:position => position, :shixun_id => self.shixun).first
  end

  # 用户关卡是否通关
  def has_passed?(user_id)
    self.games.present? && self.games.select{|game| game.user_id == user_id && game.status == 2}.length > 0
  end

  ## 选择题总分
  def choose_score
    self.challenge_chooses.sum(:score)
  end

  # 关卡总分
  def all_score
    if self.st == 1
      self.choose_score
    else
      self.score
    end
  end

  # 开启挑战
  def open_game(user_id)
    game = self.games.select([:status, :identifier]).where(user_id: user_id).first
    shixun = self.shixun
    if game.present?
      shixun.task_pass || game.status != 3 ? "/tasks/#{game.identifier}" : ""
    else
      "/api/shixuns/#{shixun.identifier}/shixun_exec"
    end
  end

  ## 用户关卡状态 0: 不能开启实训; 1:直接开启; 2表示已完成
  def user_tpi_status user_id
    # todo: 以前没加索引导致相同关卡,同一用户有多个games
    game = self.games.where(user_id: user_id).last
    status =
        if game.blank?
          self.position == 1 ? 1 : 0
        elsif game.status == 2
          2
        else
          1
        end
  end

  ## 选择题答案
  def choose_answer
    result = []
    self.challenge_chooses.each do |choose|
      result << {:position => choose.position, :answer => (choose.answer.blank? ? choose.standard_answer : choose.answer)}
    end
  end

  # 关卡用户通关数
  def user_passed_count
    games.where(status: 2).count
  end

  # 关卡用户正在挑战的人数
  def playing_count
    games.where(status: [0, 1]).count
  end

  def last_challenge
    Challenge.find_by(position: position - 1, shixun_id: shixun_id)
  end

  # 关卡评测文件

end