461 lines
16 KiB
Python
461 lines
16 KiB
Python
from django.db.models import Q, Avg, Count, Prefetch
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from django.utils import timezone
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from utils.api import APIView, validate_serializer
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from account.models import User
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from problemset.models import (
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ProblemSet,
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ProblemSetProblem,
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ProblemSetBadge,
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ProblemSetProgress,
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ProblemSetSubmission,
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UserBadge,
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)
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from problemset.serializers import (
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ProblemSetSerializer,
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ProblemSetListSerializer,
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ProblemSetProblemSerializer,
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ProblemSetBadgeSerializer,
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ProblemSetProgressSerializer,
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UserBadgeSerializer,
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JoinProblemSetSerializer,
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UpdateProgressSerializer,
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)
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from submission.models import Submission
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from problem.models import Problem
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class ProblemSetAPI(APIView):
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"""题单API - 用户端"""
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def get(self, request):
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"""获取题单列表"""
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# 预加载创建者信息
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problem_sets = ProblemSet.objects.filter(visible=True).exclude(status="draft").select_related("created_by")
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# 使用annotate在查询时计算题目数量，避免N+1查询
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problem_sets = problem_sets.annotate(
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problems_count=Count("problemsetproblem", distinct=True)
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)
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# 过滤条件
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keyword = request.GET.get("keyword", "").strip()
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if keyword:
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problem_sets = problem_sets.filter(
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Q(title__icontains=keyword) | Q(description__icontains=keyword)
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)
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difficulty = request.GET.get("difficulty")
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if difficulty:
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problem_sets = problem_sets.filter(difficulty=difficulty)
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status_filter = request.GET.get("status")
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if status_filter:
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problem_sets = problem_sets.filter(status=status_filter)
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# 排序
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sort = request.GET.get("sort")
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if sort:
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problem_sets = problem_sets.order_by(sort)
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else:
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problem_sets = problem_sets.order_by("-create_time")
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# 批量查询用户进度和已获得的奖章（如果用户已登录）
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# 注意：需要在应用prefetch_related之前获取ID列表，避免不必要的预加载
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user_progress_map = {}
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user_earned_badge_ids = set()
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if request.user.is_authenticated:
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# 先获取所有题单ID（不应用prefetch_related，只获取ID）
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problem_set_ids = list(problem_sets.values_list("id", flat=True))
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if problem_set_ids:
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# 批量查询用户在这些题单中的进度
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user_progresses = ProblemSetProgress.objects.filter(
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problemset_id__in=problem_set_ids,
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user=request.user
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).select_related("problemset")
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# 构建映射：题单ID -> 进度对象
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user_progress_map = {progress.problemset_id: progress for progress in user_progresses}
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# 批量查询用户已获得的奖章ID（这些题单相关的）
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user_earned_badge_ids = set(
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UserBadge.objects.filter(
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user=request.user,
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badge__problemset_id__in=problem_set_ids
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).values_list('badge_id', flat=True)
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)
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# 预加载奖章信息（在获取ID之后应用，避免在获取ID时也预加载）
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problem_sets = problem_sets.prefetch_related(
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Prefetch(
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"problemsetbadge_set",
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queryset=ProblemSetBadge.objects.all(),
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to_attr="badges"
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)
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)
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# 将用户进度映射和已获得的奖章ID集合存储到request中，供序列化器使用
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request._user_progress_map = user_progress_map
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request._user_earned_badge_ids = user_earned_badge_ids
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data = self.paginate_data(request, problem_sets, ProblemSetListSerializer)
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return self.success(data)
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class ProblemSetDetailAPI(APIView):
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"""题单详情API - 用户端"""
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def get(self, request, problem_set_id):
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"""获取题单详情"""
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try:
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problem_set = (
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ProblemSet.objects.filter(id=problem_set_id, visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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serializer = ProblemSetSerializer(problem_set, context={"request": request})
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return self.success(serializer.data)
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class ProblemSetProblemAPI(APIView):
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"""题单题目API - 用户端"""
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def get(self, request, problem_set_id):
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"""获取题单中的题目列表"""
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try:
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problem_set = (
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ProblemSet.objects.filter(id=problem_set_id, visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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problems = ProblemSetProblem.objects.filter(problemset=problem_set).order_by(
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"order"
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)
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serializer = ProblemSetProblemSerializer(
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problems, many=True, context={"request": request}
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)
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return self.success(serializer.data)
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class ProblemSetProgressAPI(APIView):
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"""题单进度API"""
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@validate_serializer(JoinProblemSetSerializer)
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def post(self, request):
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"""加入题单"""
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data = request.data
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try:
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problem_set = (
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ProblemSet.objects.filter(id=data["problemset_id"], visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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if ProblemSetProgress.objects.filter(
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problemset=problem_set, user=request.user
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).exists():
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return self.error("已经加入该题单")
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# 创建进度记录
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progress = ProblemSetProgress.objects.create(
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problemset=problem_set, user=request.user
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)
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progress.update_progress()
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return self.success("成功加入题单")
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def get(self, request, problem_set_id):
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"""获取题单进度"""
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try:
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problem_set = (
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ProblemSet.objects.filter(id=problem_set_id, visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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try:
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progress = ProblemSetProgress.objects.get(
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problemset=problem_set, user=request.user
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)
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except ProblemSetProgress.DoesNotExist:
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return self.error("未加入该题单")
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serializer = ProblemSetProgressSerializer(progress)
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return self.success(serializer.data)
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@validate_serializer(UpdateProgressSerializer)
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def put(self, request):
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"""更新进度"""
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data = request.data
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try:
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problem_set = (
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ProblemSet.objects.filter(id=data["problemset_id"], visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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try:
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progress = ProblemSetProgress.objects.get(
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problemset=problem_set, user=request.user
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)
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except ProblemSetProgress.DoesNotExist:
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return self.error("未加入该题单")
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# 更新详细进度
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problem_id = str(data["problem_id"])
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# 获取该题目在题单中的分值
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try:
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problemset_problem = ProblemSetProblem.objects.get(
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problemset=problem_set, problem_id=problem_id
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)
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problem_score = problemset_problem.score
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except ProblemSetProblem.DoesNotExist:
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problem_score = 0
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progress.progress_detail[problem_id] = {
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"score": problem_score, # 题单中设置的分值
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"submit_time": data.get("submit_time", timezone.now().isoformat()),
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}
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# 更新进度
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progress.update_progress()
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# 只有当提供了submission_id时才创建ProblemSetSubmission记录
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if "submission_id" in data and data["submission_id"]:
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try:
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submission = Submission.objects.get(id=data["submission_id"])
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problem = Problem.objects.get(id=problem_id)
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has_accepted = ProblemSetSubmission.objects.filter(
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problemset=problem_set,
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user=request.user,
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problem=problem,
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).exists()
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if not has_accepted:
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ProblemSetSubmission.objects.create(
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problemset=problem_set,
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user=request.user,
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submission=submission,
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problem=problem,
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)
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except Submission.DoesNotExist:
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# 如果提交记录不存在，记录错误但不中断流程
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pass
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# 检查是否获得奖章
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self._check_badges(progress)
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return self.success("进度已更新")
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def _check_badges(self, progress):
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"""检查是否获得奖章"""
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badges = ProblemSetBadge.objects.filter(problemset=progress.problemset)
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for badge in badges:
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if UserBadge.objects.filter(user=progress.user, badge=badge).exists():
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continue
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if badge.condition_type == "all_problems":
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if progress.completed_problems_count == progress.total_problems_count:
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UserBadge.objects.create(user=progress.user, badge=badge)
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elif badge.condition_type == "problem_count":
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if progress.completed_problems_count >= badge.condition_value:
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UserBadge.objects.create(user=progress.user, badge=badge)
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elif badge.condition_type == "score":
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if progress.total_score >= badge.condition_value:
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UserBadge.objects.create(user=progress.user, badge=badge)
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class UserProgressAPI(APIView):
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"""用户进度API"""
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def get(self, request):
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"""获取用户的题单进度列表"""
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progress_list = ProblemSetProgress.objects.filter(user=request.user).order_by(
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"-join_time"
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)
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serializer = ProblemSetProgressSerializer(progress_list, many=True)
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return self.success(serializer.data)
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class UserBadgeAPI(APIView):
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"""用户奖章API"""
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def get(self, request):
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"""获取用户的奖章列表"""
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# 支持通过username参数获取指定用户的徽章
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username = request.GET.get("username")
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if username:
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# 获取指定用户的徽章
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try:
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target_user = User.objects.get(username=username, is_disabled=False)
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badges = UserBadge.objects.filter(user=target_user).order_by(
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"-earned_time"
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)
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except User.DoesNotExist:
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return self.error("用户不存在")
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else:
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# 获取当前用户的徽章
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badges = UserBadge.objects.filter(user=request.user).order_by(
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"-earned_time"
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)
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serializer = UserBadgeSerializer(badges, many=True)
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return self.success(serializer.data)
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class ProblemSetBadgeAPI(APIView):
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"""题单奖章API - 用户端"""
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def get(self, request, problem_set_id):
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"""获取题单的奖章列表"""
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try:
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problem_set = (
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ProblemSet.objects.filter(id=problem_set_id, visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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badges = ProblemSetBadge.objects.filter(problemset=problem_set)
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serializer = ProblemSetBadgeSerializer(badges, many=True)
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return self.success(serializer.data)
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class ProblemSetUserProgressAPI(APIView):
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"""题单用户进度列表API"""
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def get(self, request, problem_set_id: int):
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"""获取题单的用户进度列表"""
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try:
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problem_set = (
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ProblemSet.objects.filter(id=problem_set_id, visible=True)
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.exclude(status="draft")
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.get()
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)
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except ProblemSet.DoesNotExist:
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return self.error("题单不存在")
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# 获取所有参与该题单的用户进度，使用 select_related 预加载用户信息
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progresses = ProblemSetProgress.objects.filter(
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problemset=problem_set
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).select_related("user")
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# 班级过滤
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class_name = request.GET.get("class_name", "").strip()
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if class_name:
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progresses = progresses.filter(user__username__icontains=class_name)
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# 完成度筛选
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completion_status = request.GET.get("completion_status", "").strip()
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if completion_status == "completed":
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# 已完成：所有题目都已完成
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progresses = progresses.filter(is_completed=True)
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elif completion_status == "in_progress":
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# 进行中：未完成且已开始（至少完成了一道题，排除未开始的用户）
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progresses = progresses.filter(is_completed=False, completed_problems_count__gt=0)
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elif completion_status == "not_started":
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# 未开始：还没有完成任何题目
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progresses = progresses.filter(completed_problems_count=0)
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# 排序
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progresses = progresses.order_by(
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"-is_completed", "-progress_percentage", "join_time"
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)
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# 计算统计数据（基于所有数据，而非分页数据）
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# 使用一次查询获取所有统计数据
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stats = progresses.aggregate(
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total=Count("id"),
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completed=Count("id", filter=Q(is_completed=True)),
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avg_progress=Avg("progress_percentage"),
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)
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total_count = stats["total"]
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completed_count = stats["completed"]
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avg_progress = stats["avg_progress"] or 0
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# 获取分页参数
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try:
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limit = int(request.GET.get("limit", "10"))
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except ValueError:
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limit = 10
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try:
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offset = int(request.GET.get("offset", "0"))
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except ValueError:
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offset = 0
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if offset < 0:
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offset = 0
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# 提前获取题单的所有题目（用于前端显示未完成题目和序列化器）
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# 使用 select_related 和 only 优化查询，只选择需要的字段
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all_problemset_problems = (
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ProblemSetProblem.objects.filter(problemset=problem_set)
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.select_related("problem")
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.only("problem__id", "problem___id", "problem__title", "order")
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.order_by("order")
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)
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# 构建题单所有题目的数据结构和映射
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all_problems_list = []
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all_problems_map = {}
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for psp in all_problemset_problems:
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problem_data = {
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"id": psp.problem.id,
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"_id": psp.problem._id,
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"title": psp.problem.title,
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}
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all_problems_list.append(problem_data)
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# 用于序列化器查找，key 使用字符串格式（与 progress_detail 的 key 格式一致）
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all_problems_map[str(psp.problem.id)] = psp.problem
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# 从当前页的数据中收集已完成的问题ID，用于序列化器
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paginated_progresses = list(progresses[offset : offset + limit])
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completed_problem_ids = set()
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for progress in paginated_progresses:
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if progress.progress_detail:
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# progress_detail 的 key 是字符串格式的 problem_id
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completed_problem_ids.update(progress.progress_detail.keys())
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# 从已加载的题单题目中构建 problems_dict，避免重复查询
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problems_dict = {
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pid: all_problems_map[pid]
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for pid in completed_problem_ids
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if pid in all_problems_map
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}
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# 将预加载的问题字典存储到 request 中，供序列化器使用
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request._problems_dict_cache = problems_dict
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# 使用分页
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data = self.paginate_data(request, progresses, ProblemSetProgressSerializer)
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# 添加统计数据
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data["statistics"] = {
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"total": total_count,
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"completed": completed_count,
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"avg_progress": round(avg_progress, 2),
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}
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# 返回题单的所有题目
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data["problems"] = all_problems_list
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return self.success(data)
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