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class Exercise < ApplicationRecord
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belongs_to :course, counter_cache: true
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belongs_to :exercise_bank, optional: true
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belongs_to :user
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has_many :exercise_users, -> { where("is_delete = 0") }, :dependent => :delete_all
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has_many :score_exercise_users, -> { where("is_delete = 0 and commit_status != 0").order("score desc") }, class_name: "ExerciseUser"
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has_many :exercise_questions, :dependent => :delete_all
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has_many :exercise_group_settings, :dependent => :delete_all
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has_many :published_settings, -> { exercise_group_published }, class_name: "ExerciseGroupSetting"
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has_many :tidings, as: :container
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has_many :course_acts, class_name: 'CourseActivity', as: :course_act, :dependent => :delete_all
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scope :is_exercise_published, -> { where("exercise_status > ? ",1)}
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scope :unified_setting, -> { where("unified_setting = ?",true) }
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scope :exercise_by_ids, lambda { |ids| where(id: ids) unless ids.blank? }
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scope :exercise_by_status, lambda { |s| where(exercise_status: s) unless s.blank? }
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scope :exercise_search, lambda { |keywords|
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where("exercise_name LIKE ?", "%#{keywords}%") unless keywords.blank?}
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validates :exercise_name, length: { maximum: 60, too_long: "60 characters is the maximum allowed" }
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after_create :create_exercise_list
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# 试卷的问题类型
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SINGLE = 0 #单选题
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MULTIPLE = 1 #多选题
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JUDGMENT = 2 #判断题
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COMPLETION = 3 # 填空题
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SUBJECTIVE = 4 # 主观题
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PRACTICAL = 5 #实训题
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# 试卷的状态
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UNPUBLISHED = 1 #未发布
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PUBLISHED = 2 #已发布
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DEADLINE = 3 #已截止
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ENDED = 4 #课堂已结束
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def create_exercise_list
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str = ""
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# TODO: 一次性为所有学生创建数据是否存在问题？
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self.course.students.find_each do |student|
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str += "," if str != ""
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str += "(#{student.user_id}, #{self.id}, 0, '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')"
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end
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if str != ""
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sql = "insert into exercise_users (user_id, exercise_id, commit_status, created_at, updated_at) values" + str
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ActiveRecord::Base.connection.execute sql
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end
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end
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#获取学生视角的试卷用户
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def get_stu_exercise_users
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if unified_setting #试卷统一设置
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exercise_users
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else
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ex_group_setting_ids = published_settings.pluck(:course_group_id)
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exercise_users.joins("join course_members on exercise_users.user_id=course_members.user_id").
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where(course_members: {course_group_id: ex_group_setting_ids})
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end
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end
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def get_exercise_end_time(user_id)
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if unified_setting
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self&.end_time
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else
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user_course_group = course.course_members.find_by(user_id: user_id)&.course_group_id
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exercise_group_settings.find_by(course_group_id:user_course_group)&.end_time
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end
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end
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# 根据是否统一发布获取作业的作品列表
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def all_works
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ex_users = unified_setting ? exercise_users :
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exercise_users.joins("join course_members on exercise_users.user_id=course_members.user_id").
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where(course_members: {course_group_id: published_settings.pluck(:course_group_id)})
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end
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# 分班权限的老师可见的作品列表
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def all_exercise_users user_id
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# member = course.course_member(user_id)
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teacher_course_groups = course.teacher_course_groups.get_user_groups(user_id)
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ex_users = self.all_works
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# 有分班权限的统计管理的分班且已发布的学生情况
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if teacher_course_groups.exists?
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group_ids = teacher_course_groups.pluck(:course_group_id)
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ex_users = ex_users.joins("join course_members on exercise_users.user_id=course_members.user_id").
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where(course_members: {course_group_id: group_ids})
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end
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ex_users
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end
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# #统一设置，为当前老师有权限的分班学生，分班设置，也为当前老师有权限的分班的学生
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# def all_exercise_users(user_id)
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# ex_users = exercise_users
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# group_ids = common_published_ids(user_id)
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# if group_ids.present?
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# ex_users = ex_users.joins("join course_members on exercise_users.user_id=course_members.user_id").
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# where(course_members: {course_group_id: group_ids})
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# end
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# ex_users
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# end
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#当前用户已发布的班级id和试卷分组已发布的班级id的交集
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def common_published_ids(user_id)
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current_user_groups = course.teacher_course_ids(user_id)
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if unified_setting
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published_group_ids = current_user_groups
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else
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ex_group_setting = exercise_group_settings.select(:course_group_id).pluck("course_group_id").uniq
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common_all_ids = ex_group_setting & current_user_groups #当前用户有权限的已发布的分班id #非统一设置时，为当前用户有权限的且已发布分班的id
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published_group_ids = common_all_ids.uniq
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end
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published_group_ids
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end
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#判断用户是否属于试卷分班的学生中
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def check_user_in_course(user_id,user_identity)
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ex_group_settings = exercise_group_settings.pluck(:course_group_id)
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member = course.course_members.course_find_by_ids("user_id",user_id)
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member_group_id = member.pluck(:course_group_id).uniq
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((member_group_id & ex_group_settings).size > 0 || user_identity < Course::STUDENT) ? true : false
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end
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#判断是否为分班，如果分班，试卷的截止时间为当前分班时间，否则为试卷的截止时间
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def get_exercise_status(user)
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return Exercise::UNPUBLISHED if user.nil?
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if user.student_of_course?(course) #当为学生的时候,需根据分班来判断试卷状态
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ex_time = get_exercise_times(user_id,false)
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pb_time = ex_time[:publish_time]
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ed_time = ex_time[:end_time]
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if pb_time.present? && ed_time.present? && pb_time <= Time.now && ed_time > Time.now
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status = Exercise::PUBLISHED
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elsif ed_time.present? && ed_time <= Time.now
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status = Exercise::ENDED
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else
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status = Exercise::UNPUBLISHED
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end
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else
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status = exercise_status #当为老师的时候，则为试卷的总状态
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end
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status
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end
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#获取试卷的发布时间和截止时间。teacher 为boolean,当为true时，表示的是当前为老师
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def get_exercise_times(user_id,teacher)
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if unified_setting || teacher #当试卷为统一设置或当前为老师的时候
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pb_time = publish_time
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en_time = end_time
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if (exercise_status != 3) && en_time.present? && (en_time <= Time.now)
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update_column("exercise_status",3)
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end
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else
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ex_group_setting = exercise_group_settings
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user_group = course.students.where(user_id:user_id).select(:course_group_id)
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if user_group.exists?
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user_group_id = user_group.first&.course_group_id
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user_ex_group_setting = ex_group_setting.where(course_group_id:user_group_id).select(:publish_time,:end_time)
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pb_time = user_ex_group_setting.first&.publish_time
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en_time = user_ex_group_setting.first&.end_time
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else
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pb_time = nil
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en_time = nil
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end
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end
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{
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"publish_time":pb_time,
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"end_time":en_time
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}
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end
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#判断当前用户的答题状态
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def check_user_answer_status(user)
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ex_answer_user = exercise_users.where(user_id: user.id).select(:start_at,:end_at,:commit_status)
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user_ex_status = get_exercise_status(user)
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user_status = 2
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if ex_answer_user.exists? && (ex_answer_user.first&.start_at.present? || ex_answer_user.first&.end_at.present?) #学生有过答题的,或者立即截止，但学生未做试卷的
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user_status = ex_answer_user.first.commit_status
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end
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if ex_answer_user.exists? && ex_answer_user.first&.start_at.blank? && user_ex_status == 3
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user_status = 4
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end
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user_status
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end
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end
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