c94640c890
Root cause of lost PREP 2016 quiz: deleting a section (e.g. to recreate with different page ranges) cascade-deleted ALL quizzes attached to it, destroying the quiz AND all its questions permanently. Fixes: - Section.quizzes relationship: removed cascade="all, delete-orphan" Deleting a section no longer touches quizzes at all - Quiz.section_id FK: changed to ON DELETE SET NULL, nullable=True If a section is deleted, quizzes keep working (section_id becomes null) - DB migration: drops old FK constraint and recreates with SET NULL Also answers the question about deleting a bank question in a quiz: - quiz_question_links FK has ON DELETE CASCADE — deleting a question silently removes it from all quizzes - This needs a warning UI (not yet implemented — no delete button in bank) Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
39 lines
2 KiB
Python
39 lines
2 KiB
Python
from datetime import datetime
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from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Text
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from sqlalchemy.orm import relationship
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from app.database import Base
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from app.models.quiz_category import QuizCategory # noqa — ensures mapper resolves "QuizCategory"
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from app.models.quiz_question_link import QuizQuestionLink # noqa
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class Quiz(Base):
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__tablename__ = "quizzes"
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id = Column(Integer, primary_key=True, index=True)
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section_id = Column(Integer, ForeignKey("sections.id", ondelete="SET NULL"), nullable=True)
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user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
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category_id = Column(Integer, ForeignKey("quiz_categories.id", ondelete="SET NULL"), nullable=True)
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title = Column(String, nullable=False)
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questions_count = Column(Integer, default=0)
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time_limit_minutes = Column(Integer, nullable=True) # null = no limit
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mode = Column(String, default="timed") # timed, learning
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skipped_questions = Column(Text, nullable=True) # JSON list of skipped question texts
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created_at = Column(DateTime, default=datetime.utcnow)
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deleted_at = Column(DateTime, nullable=True) # soft delete — null = active
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is_published = Column(Integer, default=1) # 1 = visible to users, 0 = hidden (admin only)
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section = relationship("Section", back_populates="quizzes")
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user = relationship("User", back_populates="quizzes")
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category = relationship("QuizCategory", back_populates="quizzes", foreign_keys=[category_id])
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questions = relationship(
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"Question",
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secondary="quiz_question_links",
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primaryjoin="Quiz.id == foreign(QuizQuestionLink.quiz_id)",
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secondaryjoin="Question.id == foreign(QuizQuestionLink.question_id)",
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order_by="QuizQuestionLink.position",
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viewonly=True, # mutations handled explicitly via QuizQuestionLink
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)
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attempts = relationship("QuizAttempt", back_populates="quiz", cascade="all, delete-orphan")
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reminders = relationship("ReminderSchedule", cascade="all, delete-orphan", foreign_keys="ReminderSchedule.quiz_id")
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