fix: API 全部改用显式两步走 await session.execute + result.scalars()

之前 (await ...).scalars() 链式在 SQLAlchemy 2.0 async 下报
'coroutine' has no attribute 'scalars' 错误。改为先 await 拿 result
再 .scalars(),这是 SQLAlchemy 2.0 推荐的 async 写法。

scripts/_fix_scalars.py

@@ -0,0 +1,63 @@
+"""批量修 API 文件:把 `(await ...).scalars()` 改成显式两步走。"""
+import re
+from pathlib import Path
+
+api_dir = Path("D:/selftools/diary-news/backend/app/api")
+files = list(api_dir.glob("*.py"))
+
+# 模式 1: user = (await ...).scalars().first()  (多行括号形式)
+# 模式 2: rows = (await ...).scalars()  (单行)
+# 都改成 result = await ...; user = result.scalars().first() 这种
+
+for f in files:
+    src = f.read_text(encoding="utf-8")
+    orig = src
+    changed = False
+
+    # 模式 1:跨行的( await ... ).scalars().first()
+    # 匹配:任意前缀(空白)+ ( 多行 await session.execute(...) ) .scalars() .first()
+    pat1 = re.compile(
+        r'(\s+)([\w_]+)\s*=\s*\(\s*\n'
+        r'(\s+)await\s+session\.execute\((.*?)\)\s*\n'
+        r'\s+\)\s*'
+        r'\.scalars\(\)\s*'
+        r'\.first\(\)',
+        re.DOTALL,
+    )
+    def repl1(m):
+        indent = m.group(1)
+        var = m.group(2)
+        inner_indent = m.group(3)
+        exec_arg = m.group(4)
+        return (
+            f"{indent}result = await session.execute({exec_arg})\n"
+            f"{indent}{var} = result.scalars().first()"
+        )
+    new = pat1.sub(repl1, src)
+    if new != src:
+        changed = True
+        src = new
+
+    # 模式 2:单行 (await session.execute(...)).scalars()
+    pat2 = re.compile(
+        r'(\s+)([\w_]+)\s*=\s*\(await\s+session\.execute\((.*?)\)\)\s*\.scalars\(\)',
+        re.DOTALL,
+    )
+    def repl2(m):
+        indent = m.group(1)
+        var = m.group(2)
+        exec_arg = m.group(3)
+        return (
+            f"{indent}result = await session.execute({exec_arg})\n"
+            f"{indent}{var} = result.scalars()"
+        )
+    new = pat2.sub(repl2, src)
+    if new != src:
+        changed = True
+        src = new
+
+    if changed:
+        f.write_text(src, encoding="utf-8")
+        print(f"[ok] {f.name}")
+    else:
+        print(f"     {f.name}")