From f1097788f12ad8b299f02cfabe570f0f0f696867 Mon Sep 17 00:00:00 2001
From: moyechen <sages7@126.com>
Date: Fri, 8 Dec 2023 16:48:46 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=E7=AC=94=E8=AE=B0=E4=BA=8E?=
 =?UTF-8?q?=202023-12-08=5F16:48:45?=
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---
 ...55\347\232\204\351\227\256\351\242\230.md" |  72 ++++++++++++++++++
 python/vx.json                                |  10 +++
 vx_notebook/notebook.db                       | Bin 24576 -> 24576 bytes
 3 files changed, 82 insertions(+)
 create mode 100644 "python/python\345\217\257\345\217\230\345\257\271\350\261\241\345\234\250sqlalchemy\344\270\255\347\232\204\351\227\256\351\242\230.md"

diff --git "a/python/python\345\217\257\345\217\230\345\257\271\350\261\241\345\234\250sqlalchemy\344\270\255\347\232\204\351\227\256\351\242\230.md" "b/python/python\345\217\257\345\217\230\345\257\271\350\261\241\345\234\250sqlalchemy\344\270\255\347\232\204\351\227\256\351\242\230.md"
new file mode 100644
index 0000000..94f99db
--- /dev/null
+++ "b/python/python\345\217\257\345\217\230\345\257\271\350\261\241\345\234\250sqlalchemy\344\270\255\347\232\204\351\227\256\351\242\230.md"
@@ -0,0 +1,72 @@
+# python可变对象在sqlalchemy中的问题
+
+
+## 问题
+sqlalchemy 在处理可变对象时，如果可变对象地址没有变化，不会触发更新
+
+
+```python
+
+repo = session_maker
+
+async def test_edit_fields(
+    self, engine,init_app_page_extractions
+):
+    repo = container.repo()
+    async with repo.new_session() as session, session.begin():
+        result = await repo.session.execute(select(PageCommandOrm))
+        pages = result.scalars().all()
+        for row in pages:
+            print(row.edit_fields)
+            row.edit_fields["ff"] = 1
+
+
+        repo.session.add_all(pages)
+
+    async with repo.new_session() as session, session.begin():
+        session.flush()
+        result = await repo.session.execute(select(PageCommandOrm))
+        pages = result.scalars().all()
+        for row in pages:
+            print(row.edit_fields)
+
+```
+
+输出如下
+```
+{}
+{}
+{}
+{}
+{}
+{}
+```
+
+在上面的例子中，`row.edit_fields["ff"] = 1` 这样的操作不会修改edit_fields 这个变量的地址，因此sqlalchemy认为未修改该字段，不会更新该字段
+
+而`row.edit_fields = {"ff":1}` 修改了，触发了更新
+
+
+## 解决方案
+
+使用官方提供的方法`flag_modified`
+
+```
+from sqlalchemy.orm.attributes import flag_modified
+
+async def test_edit_fields(
+    self, engine, init_app_page_extractions
+):
+    
+    repo = container.repo()
+    async with repo.new_session() as session, session.begin():
+        result = await repo.session.execute(select(PageCommandOrm))
+        pages = result.scalars().all()
+        for row in pages:
+            print(row.edit_fields)
+            row.edit_fields["ff"] = 1
+            flag_modified(row, "edit_fields") # 标记该字段需更新
+           
+
+        repo.session.add_all(pages)
+```
\ No newline at end of file
diff --git a/python/vx.json b/python/vx.json
index 833a7ee..75f24e2 100644
--- a/python/vx.json
+++ b/python/vx.json
@@ -160,6 +160,16 @@
             "signature": "207324052537419",
             "tags": [
             ]
+        },
+        {
+            "attachment_folder": "",
+            "created_time": "2023-12-08T07:18:13Z",
+            "id": "181",
+            "modified_time": "2023-12-08T08:48:35Z",
+            "name": "python可变对象在sqlalchemy中的问题.md",
+            "signature": "207324068365109",
+            "tags": [
+            ]
         }
     ],
     "folders": [
diff --git a/vx_notebook/notebook.db b/vx_notebook/notebook.db
index 15e568a396e72c43511418eb6d91c0e6b62705a5..2c5fee6ef9b7b70faacc12fff2f43d3b7309f61a 100644
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