Moved the __query_line_items method in the UnappliedOriginalLineItems report to the new "accounting.utils.unapplied" module, to share this query.

src/accounting/utils/unapplied.py

@@ -0,0 +1,72 @@
+# The Mia! Accounting Project.
+# Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/8
+
+#  Copyright (c) 2023 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+"""The unapplied original line item utilities.
+
+"""
+from decimal import Decimal
+
+import sqlalchemy as sa
+from sqlalchemy.orm import selectinload
+
+from accounting import db
+from accounting.models import Account, JournalEntry, JournalEntryLineItem
+from accounting.utils.cast import be
+from accounting.utils.offset_alias import offset_alias
+
+
+def get_unapplied_original_line_items(account: Account) \
+        -> list[JournalEntryLineItem]:
+    """Queries and returns the unapplied original line items in an account.
+
+    :param account: The account.
+    :return: The unapplied original line items in the account.
+    """
+    offset: sa.Alias = offset_alias()
+    net_balance: sa.Label \
+        = (JournalEntryLineItem.amount
+           + sa.func.sum(sa.case(
+                (be(offset.c.is_debit == JournalEntryLineItem.is_debit),
+                 offset.c.amount),
+                else_=-offset.c.amount))).label("net_balance")
+    select_net_balances: sa.Select \
+        = sa.select(JournalEntryLineItem.id, net_balance) \
+        .join(Account) \
+        .join(offset, be(JournalEntryLineItem.id
+                         == offset.c.original_line_item_id),
+              isouter=True) \
+        .filter(be(Account.id == account.id),
+                sa.or_(sa.and_(Account.base_code.startswith("2"),
+                               sa.not_(JournalEntryLineItem.is_debit)),
+                       sa.and_(Account.base_code.startswith("1"),
+                               JournalEntryLineItem.is_debit))) \
+        .group_by(JournalEntryLineItem.id) \
+        .having(sa.or_(sa.func.count(offset.c.id) == 0, net_balance != 0))
+    net_balances: dict[int, Decimal] \
+        = {x.id: x.net_balance
+           for x in db.session.execute(select_net_balances).all()}
+    line_items: list[JournalEntryLineItem] = JournalEntryLineItem.query \
+        .filter(JournalEntryLineItem.id.in_({x for x in net_balances})) \
+        .join(JournalEntry) \
+        .order_by(JournalEntry.date, JournalEntry.no,
+                  JournalEntryLineItem.is_debit, JournalEntryLineItem.no) \
+        .options(selectinload(JournalEntryLineItem.currency),
+                 selectinload(JournalEntryLineItem.journal_entry)).all()
+    for line_item in line_items:
+        line_item.net_balance = line_item.amount \
+            if net_balances[line_item.id] is None \
+            else net_balances[line_item.id]
+    return line_items