96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
from django.core.cache import cache
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from rest_framework import serializers
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from account.models import User
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from achievement.models import Achievement, UserAchievement
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def get_active_user_count():
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"""获得率的分母：未禁用用户总数，缓存 1 小时。
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不用"有过提交的用户数"这类动态口径：分母波动会让同一个成就的获得率
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忽高忽低，学生会当成 bug。
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"""
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count = cache.get("achievement_active_user_count")
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if count is None:
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count = User.objects.filter(is_disabled=False).count()
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cache.set("achievement_active_user_count", count, 3600)
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return count
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class AchievementSerializer(serializers.ModelSerializer):
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unlocked = serializers.BooleanField(read_only=True)
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unlock_time = serializers.DateTimeField(read_only=True, allow_null=True)
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backfilled = serializers.BooleanField(read_only=True)
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progress = serializers.IntegerField(read_only=True, allow_null=True)
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unlock_rate = serializers.SerializerMethodField()
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name = serializers.SerializerMethodField()
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description = serializers.SerializerMethodField()
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icon = serializers.SerializerMethodField()
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# 条件三件套也必须跟着遮掉：只遮名称和描述、却明文下发
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# metric/operator/threshold，学生打开 DevTools 就知道"凌晨提交 10 次"，
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# 隐藏成就的意义全部作废
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metric = serializers.SerializerMethodField()
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operator = serializers.SerializerMethodField()
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threshold = serializers.SerializerMethodField()
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class Meta:
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model = Achievement
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fields = (
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"id",
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"name",
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"description",
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"icon",
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"rarity",
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"hidden",
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"metric",
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"operator",
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"threshold",
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"unlocked",
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"unlock_time",
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"backfilled",
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"progress",
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"unlock_rate",
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)
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def _masked(self, obj):
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return obj.hidden and not getattr(obj, "unlocked", False)
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def get_name(self, obj):
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return "???" if self._masked(obj) else obj.name
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def get_description(self, obj):
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return "达成条件保密" if self._masked(obj) else obj.description
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def get_icon(self, obj):
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return "❓" if self._masked(obj) else obj.icon
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def get_metric(self, obj):
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return None if self._masked(obj) else obj.metric
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def get_operator(self, obj):
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return None if self._masked(obj) else obj.operator
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def get_threshold(self, obj):
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return None if self._masked(obj) else obj.threshold
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def get_unlock_rate(self, obj):
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total = get_active_user_count()
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if not total:
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return 0.0
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return round(obj.unlock_count / total * 100, 1)
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class PendingAchievementSerializer(serializers.ModelSerializer):
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"""待弹窗的解锁记录，无需打码（已解锁）。"""
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id = serializers.IntegerField(source="achievement_id", read_only=True)
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name = serializers.CharField(source="achievement.name", read_only=True)
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description = serializers.CharField(source="achievement.description", read_only=True)
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icon = serializers.CharField(source="achievement.icon", read_only=True)
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rarity = serializers.CharField(source="achievement.rarity", read_only=True)
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class Meta:
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model = UserAchievement
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fields = ("id", "name", "description", "icon", "rarity")
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