feat: default workflow batch filters to latest batch

app/gui/tabs/apply.py

@@ -376,14 +376,20 @@ class ApplyTab(QWidget):
         )
 
     def _populate_batch_filter(self, batches, selected_batch):
-        previous = selected_batch if selected_batch in {batch.id for batch in batches} else None
+        had_previous_items = self.batch_filter.count() > 0
         self.batch_filter.blockSignals(True)
         self.batch_filter.clear()
         self.batch_filter.addItem("全部批次", None)
         for batch in batches:
             self.batch_filter.addItem(self._batch_label(batch), batch.id)
-        index = self.batch_filter.findData(previous)
+        self.batch_filter.setCurrentIndex(
-        self.batch_filter.setCurrentIndex(index if index >= 0 else 0)
+            _batch_filter_current_index(
+                self.batch_filter,
+                batches,
+                selected_batch,
+                had_previous_items,
+            )
+        )
         self.batch_filter.blockSignals(False)
 
     def _populate_shop_filter(self, tasks, account_rows, selected_shop):

app/gui/tabs/collect.py

@@ -375,15 +375,20 @@ class CollectTab(QWidget):
         self._update_delete_batch_button()
 
     def _populate_batch_filter(self, batches, selected_batch):
-        batch_ids = {batch.id for batch in batches}
+        had_previous_items = self.batch_filter.count() > 0
-        previous = selected_batch if selected_batch in batch_ids else None
         self.batch_filter.blockSignals(True)
         self.batch_filter.clear()
         self.batch_filter.addItem("全部批次", None)
         for batch in batches:
             self.batch_filter.addItem(self._batch_label(batch), batch.id)
-        index = self.batch_filter.findData(previous)
+        self.batch_filter.setCurrentIndex(
-        self.batch_filter.setCurrentIndex(index if index >= 0 else 0)
+            _batch_filter_current_index(
+                self.batch_filter,
+                batches,
+                selected_batch,
+                had_previous_items,
+            )
+        )
         self.batch_filter.blockSignals(False)
 
     def _batch_label(self, batch):

app/gui/tabs/generate.py

@@ -1000,14 +1000,20 @@ class GenerateTab(QWidget):
         _set_empty_state(self.empty_state_card, self.empty_state_label, self.empty_state_button)
 
     def _populate_batch_filter(self, batches, selected_batch):
-        previous = selected_batch if selected_batch in {batch.id for batch in batches} else None
+        had_previous_items = self.batch_filter.count() > 0
         self.batch_filter.blockSignals(True)
         self.batch_filter.clear()
         self.batch_filter.addItem("全部批次", None)
         for batch in batches:
             self.batch_filter.addItem(self._batch_label(batch), batch.id)
-        index = self.batch_filter.findData(previous)
+        self.batch_filter.setCurrentIndex(
-        self.batch_filter.setCurrentIndex(index if index >= 0 else 0)
+            _batch_filter_current_index(
+                self.batch_filter,
+                batches,
+                selected_batch,
+                had_previous_items,
+            )
+        )
         self.batch_filter.blockSignals(False)
 
     def _populate_shop_filter(self, tasks, account_rows, selected_shop):

app/gui/widgets.py

@@ -405,6 +405,19 @@ def _set_batch_progress_overview(label, tasks):
     label.setText(_format_batch_progress(summary) if active else "")
 
 
+def _batch_filter_current_index(combo, batches, selected_batch, had_previous_items):
+    batch_ids = {batch.id for batch in batches}
+    if selected_batch in batch_ids:
+        index = combo.findData(selected_batch)
+        if index >= 0:
+            return index
+    if selected_batch is None and had_previous_items:
+        index = combo.findData(None)
+        if index >= 0:
+            return index
+    return 1 if batches else 0
+
+
 def _database_path(db_path=None, config=None) -> str:
     return db_path or appconfig.db_path(config)
 

docs/tasks/T-550.md

@@ -3,7 +3,7 @@ id: T-550
 title: ①②③ 批次下拉默认选中最新批次
 phase: 7
 deps: [T-523, T-206]
-status: TODO
+status: DONE
 created: 2026-07-08
 ---
 
@@ -41,4 +41,7 @@ created: 2026-07-08
 
 ## 执行记录
 
-（做完在此记录：改了哪些文件、跑的验证命令与结果、决策）
+- 2026-07-08：完成 T-550。
+- 代码：`app/gui/widgets.py` 新增批次下拉默认索引 helper；①`CollectTab`、②`GenerateTab`、③`ApplyTab` 的 `_populate_batch_filter` 改为“有效已选批次优先；用户手动选过全部批次则保留；无有效已记住选择且存在批次时默认选 index 1 最新批次；无批次回退 index 0”。
+- 测试：`tests/test_gui.py` 新增 ①②③ 批次下拉默认最新批次、无批次回退、已记住批次优先、手动全部批次保留的覆盖；导入测试补充断言 ① 导入后仍自动选中新批次；原②③列表筛选测试显式手动选择「全部批次」，保持原测试目标。
+- 验证：`py -3.10 -m unittest discover -s tests -p "test_gui.py"` 通过（103 tests）；`python -m ruff check app tests main.py` 通过；`py -3.10 -m compileall app main.py` 通过；`git diff --check` 通过；`py -3.10 -m unittest discover -s tests` 通过（253 tests）。

tests/test_gui.py

@@ -86,6 +86,17 @@ class GuiTests(TempDirMixin, unittest.TestCase):
         self.assertIsNotNone(value)
         self.assertEqual(color, value.name())
 
+    def set_batch_created_at(self, cfg, batch_id, created_at):
+        conn = db.connect(cfg["db_path"])
+        try:
+            with conn:
+                conn.execute(
+                    "UPDATE batches SET created_at = ?, updated_at = ? WHERE id = ?",
+                    (created_at, created_at, batch_id),
+                )
+        finally:
+            conn.close()
+
     def make_fake_message_box(self, selected_label):
         boxes = []
 
@@ -511,6 +522,53 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
+    def test_workflow_batch_filters_default_to_latest_batch_and_remember_selection(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self.make_config(temp_dir)
+
+            for tab_class in (CollectTab, GenerateTab, ApplyTab):
+                tab = tab_class(config=cfg)
+                self.addCleanup(tab.close)
+                self.assertEqual(0, tab.batch_filter.currentIndex())
+                self.assertIsNone(tab.batch_filter.currentData())
+
+            accounts.create_account("主店", "alias-a", debug_port=9222, config=cfg)
+            older_batch = db.create_batch(["older.xlsx"], path=cfg["db_path"])
+            newer_batch = db.create_batch(["newer.xlsx"], path=cfg["db_path"])
+            self.set_batch_created_at(cfg, older_batch, "2026-07-08T10:00:00")
+            self.set_batch_created_at(cfg, newer_batch, "2026-07-08T11:00:00")
+            for batch_id, item_id in ((older_batch, "1001"), (newer_batch, "2001")):
+                db.insert_tasks(
+                    batch_id,
+                    [
+                        {
+                            "source_file_abs": os.path.join(temp_dir, f"{item_id}.xlsx"),
+                            "source_sheet": "商品",
+                            "source_row": 2,
+                            "account_name": "Excel主店",
+                            "alias": "alias-a",
+                            "item_id": item_id,
+                        }
+                    ],
+                    path=cfg["db_path"],
+                )
+
+            for tab_class in (CollectTab, GenerateTab, ApplyTab):
+                tab = tab_class(config=cfg)
+                self.addCleanup(tab.close)
+                self.assertEqual(newer_batch, tab.batch_filter.currentData())
+                self.assertEqual(1, tab.batch_filter.currentIndex())
+
+                tab.batch_filter.setCurrentIndex(tab.batch_filter.findData(older_batch))
+                tab.refresh_tasks()
+                self.assertEqual(older_batch, tab.batch_filter.currentData())
+
+                tab.batch_filter.setCurrentIndex(tab.batch_filter.findData(None))
+                tab.refresh_tasks()
+                self.assertIsNone(tab.batch_filter.currentData())
+
+        self.assert_removed(temp_dir)
+
     def test_settings_tab_loads_ai_models_and_masks_key_field(self):
         with self.make_temp_dir() as temp_dir:
             cfg = self.make_config(temp_dir)
@@ -2750,6 +2808,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
             tab = ApplyTab(config=cfg)
             self.addCleanup(tab.close)
+            tab.batch_filter.setCurrentIndex(tab.batch_filter.findData(None))
 
             self.assertIsInstance(tab.task_table, QTableView)
             self.assertEqual(["店铺", "商品ID", "新标题", "新封面", "阶段", "结果"], tab.model.HEADERS)
@@ -3718,6 +3777,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
 
             tab = GenerateTab(config=cfg)
             self.addCleanup(tab.close)
+            tab.batch_filter.setCurrentIndex(tab.batch_filter.findData(None))
 
             self.assertEqual("generateItemFilter", tab.item_filter.objectName())
             self.assertEqual(4, tab.model.rowCount())
@@ -4243,9 +4303,11 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             statuses = []
             tab = CollectTab(config=cfg, status_callback=statuses.append)
             self.addCleanup(tab.close)
+            created = {}
 
             def fake_import(file_paths, path=None):
                 batch_id = db.create_batch(file_paths, path=path)
+                created["batch_id"] = batch_id
                 db.insert_tasks(
                     batch_id,
                     [
@@ -4290,6 +4352,7 @@ class GuiTests(TempDirMixin, unittest.TestCase):
             self.assertIn("匹配1", tab.summary_label.text())
             self.assertEqual("", tab.show_unmatched_button.styleSheet())
             self.assertIn("入库1", statuses[-1])
+            self.assertEqual(created["batch_id"], tab.batch_filter.currentData())
 
         self.assert_removed(temp_dir)