优化“知识库模块“--基本完善

backend/app/crud/faq_category.py

@@ -45,6 +45,20 @@ async def get_category(db: AsyncSession, category_id: uuid.UUID) -> FaqCategory
     return result.scalar_one_or_none()
 
 
+async def get_category_by_name(
+    db: AsyncSession,
+    study_id: uuid.UUID | None,
+    name: str,
+) -> FaqCategory | None:
+    stmt = select(FaqCategory).where(FaqCategory.name == name)
+    if study_id is None:
+        stmt = stmt.where(FaqCategory.study_id.is_(None))
+    else:
+        stmt = stmt.where(FaqCategory.study_id == study_id)
+    result = await db.execute(stmt)
+    return result.scalar_one_or_none()
+
+
 async def update_category(db: AsyncSession, category: FaqCategory, category_in: CategoryUpdate) -> FaqCategory:
     update_data = category_in.model_dump(exclude_unset=True)
     if update_data: