DrCr/drcr/statements/models.py

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2022-12-24 12:31:45 +11:00
# DrCr: Web-based double-entry bookkeeping framework
# Copyright (C) 2022 Lee Yingtong Li (RunasSudo)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
from sqlalchemy import Column, DateTime, ForeignKey, Integer, String
from sqlalchemy.orm import relationship
from ..database import Base, db_session
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from ..models import Amount, Posting, Transaction
class StatementLine(Base):
__tablename__ = 'statement_lines'
id = Column(Integer, primary_key=True)
source_account = Column(String)
dt = Column(DateTime)
description = Column(String)
quantity = Column(Integer)
balance = Column(Integer)
commodity = Column(String)
postings = relationship('StatementLinePosting', back_populates='statement_line')
def amount(self):
return Amount(self.quantity, self.commodity)
def into_transaction(self):
if len(self.postings) > 0:
# Will already be accounted for in a StatementLineTransaction
#return None
raise Exception('Should not call into_transaction on a StatementLine with associated StatementLinePosting')
# Not classified
unclassified_name = 'Unclassified Statement Line Debits' if -self.quantity >= 0 else 'Unclassified Statement Line Credits'
return Transaction(
dt=self.dt,
description=self.description,
postings=[
Posting(account=self.source_account, quantity=self.quantity, commodity=self.commodity),
Posting(account=unclassified_name, quantity=-self.quantity, commodity=self.commodity)
]
)
def is_complex(self):
if len(self.postings) > 1:
return True
if any(len(p.transaction.postings) > 2 for p in self.postings):
return True
return False
def delete_postings(self):
"""Delete existing StatementLineTransactions with postings for this StatementLine"""
for posting in self.postings:
# TODO: Will be wonky if transaction covers multiple StatementLines
db_session.delete(posting.transaction)
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class StatementLineTransaction(Base, Transaction):
__tablename__ = 'statement_line_transactions'
id = Column(Integer, primary_key=True)
dt = Column(DateTime)
description = Column(String)
postings = relationship('StatementLinePosting', back_populates='transaction', cascade='all, delete')
def charge_account(self, source_account):
if len(self.postings) > 2:
raise Exception('Cannot call charge_account on StatementLineTransaction with more than 2 postings')
for posting in self.postings:
if posting.account != source_account:
return posting.account
class StatementLinePosting(Base, Posting):
__tablename__ = 'statement_line_postings'
id = Column(Integer, primary_key=True)
transaction_id = Column(Integer, ForeignKey('statement_line_transactions.id'))
line_id = Column(Integer, ForeignKey('statement_lines.id'))
description = Column(String)
account = Column(String)
quantity = Column(Integer)
commodity = Column(String)
transaction = relationship('StatementLineTransaction', back_populates='postings')
statement_line = relationship('StatementLine', back_populates='postings')
def amount(self):
return Amount(self.quantity, self.commodity)