CSV取込機能を実装し、Expenseモデルと関連するStore・ExpenseCategoryモデルを追加。CSVパーサーを作成し、出光CSVに対応。明細編集画面のAJAX保存機能を実装し、取込結果を表示する機能を追加。作業ログをdiary.mdに追記。

expenses/services.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+from typing import Iterable
+
+from .csv_parsers import get_parser
+from .models import Expense
+
+
+class CSVImportResult:
+    def __init__(self, imported: int, duplicated: int) -> None:
+        self.imported = imported
+        self.duplicated = duplicated
+
+
+def import_csv_lines(lines: Iterable[str]) -> CSVImportResult:
+    buffered_lines = list(lines)
+    parser = get_parser(buffered_lines)
+    rows = parser.parse(buffered_lines)
+    imported = 0
+    duplicated = 0
+    for row in rows:
+        expense, created = Expense.objects.get_or_create(
+            source=row.source,
+            source_hash=row.source_hash,
+            defaults={
+                'use_date': row.use_date,
+                'description': row.description,
+                'amount': row.amount,
+                'note': row.note,
+            },
+        )
+        if created:
+            imported += 1
+        else:
+            duplicated += 1
+    return CSVImportResult(imported=imported, duplicated=duplicated)