224 lines
7.9 KiB
Python
224 lines
7.9 KiB
Python
# The accounting application of the Mia project.
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# by imacat <imacat@mail.imacat.idv.tw>, 2020/6/29
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# Copyright (c) 2020 imacat.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""The data models of the accounting application.
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"""
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from django.conf import settings
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from django.db import models
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from django.urls import reverse
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class Subject(models.Model):
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"""An accounting subject."""
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sn = models.PositiveIntegerField(primary_key=True)
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parent = models.ForeignKey(
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"self", on_delete=models.PROTECT, null=True, blank=True,
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db_column="parent_sn")
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code = models.CharField(max_length=5)
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title_zhtw = models.CharField(max_length=32)
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title_en = models.CharField(max_length=128, null=True, blank=True)
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title_zhcn = models.CharField(
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max_length=32, null=True, blank=True)
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created_at = models.DateTimeField(
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auto_now_add=True, db_column="created")
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created_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
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db_column="createdby",
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related_name="created_accounting_subjects")
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updated_at = models.DateTimeField(
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auto_now_add=True, db_column="updated")
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updated_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
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db_column="updatedby",
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related_name="updated_accounting_subjects")
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def __str__(self):
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"""Returns the string representation of this accounting
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subject."""
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return self.code.__str__() + " " + self.title_zhtw.__str__()
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class Meta:
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db_table = "accounting_subjects"
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ordering = ["code"]
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class Transaction(models.Model):
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"""An accounting transaction."""
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sn = models.PositiveIntegerField(primary_key=True)
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date = models.DateField()
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ord = models.PositiveSmallIntegerField(default=1)
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note = models.CharField(max_length=128, null=True, blank=True)
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created_at = models.DateTimeField(
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auto_now_add=True, db_column="created")
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created_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
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db_column="createdby",
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related_name="created_accounting_transactions")
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updated_at = models.DateTimeField(
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auto_now_add=True, db_column="updated")
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updated_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
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db_column="updatedby",
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related_name="updated_accounting_transactions")
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@property
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def debit_records(self):
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"""The debit records of this transaction."""
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return [x for x in self.record_set.all() if not x.is_credit]
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@property
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def credit_records(self):
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"""The credit records of this transaction."""
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return [x for x in self.record_set.all() if x.is_credit]
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_is_balanced = None
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@property
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def is_balanced(self):
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"""Whether the sum of the amounts of the debit records is the
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same as the sum of the amounts of the credit records. """
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if self._is_balanced is None:
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debit_sum = sum([x.amount for x in self.debit_records])
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credit_sum = sum([x.amount for x in self.credit_records])
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self._is_balanced = debit_sum == credit_sum
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return self._is_balanced
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@is_balanced.setter
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def is_balanced(self, value):
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self._is_balanced = value
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@property
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def has_many_same_day(self):
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"""whether there are more than one transactions at this day,
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so that the user can sort their orders. """
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return Transaction.objects.filter(
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date=self.date).count() > 1
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@property
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def has_order_hole(self):
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"""Whether the order of the transactions on this day is not
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1, 2, 3, 4, 5..., and should be reordered. """
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if self._has_order_hole is None:
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orders = [x.ord for x in Transaction.objects.filter(
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date=self.date).order_by("-ord")]
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if orders[0] != len(orders):
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self._has_order_hole = True
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elif len(orders) != len(set(orders)):
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self._has_order_hole = True
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else:
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self._has_order_hole = False
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return self._has_order_hole
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@has_order_hole.setter
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def has_order_hole(self, value):
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self._has_order_hole = value
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@property
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def is_cash_income(self):
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"""Whether this transaction is a cash income transaction."""
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debit_records = self.debit_records
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return (len(debit_records) == 1
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and debit_records[0].subject.code == "1111"
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and debit_records[0].summary is None)
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@property
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def is_cash_expense(self):
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"""Whether this transaction is a cash expense transaction."""
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credit_records = self.credit_records
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return (len(credit_records) == 1
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and credit_records[0].subject.code == "1111"
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and credit_records[0].summary is None)
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def get_absolute_url(self):
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"""Returns the URL to view this transaction."""
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if self.is_cash_expense:
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return reverse(
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"accounting:transaction", args=("expense", self.sn))
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elif self.is_cash_income:
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return reverse(
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"accounting:transaction", args=("income", self.sn))
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else:
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return reverse(
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"accounting:transaction", args=("transfer", self.sn))
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def __str__(self):
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"""Returns the string representation of this accounting
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transaction."""
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return self.date.__str__() + " #" + self.ord.__str__()
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class Meta:
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db_table = "accounting_transactions"
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ordering = ["date", "ord"]
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class Record(models.Model):
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"""An accounting record."""
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sn = models.PositiveIntegerField(primary_key=True)
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transaction = models.ForeignKey(
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Transaction, on_delete=models.CASCADE,
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db_column="transaction_sn")
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is_credit = models.BooleanField()
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ord = models.PositiveSmallIntegerField(default=1)
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subject = models.ForeignKey(
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Subject, on_delete=models.PROTECT, db_column="subject_sn")
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summary = models.CharField(max_length=128, blank=True, null=True)
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amount = models.PositiveIntegerField()
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created_at = models.DateTimeField(
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auto_now_add=True, db_column="created")
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created_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
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db_column="createdby",
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related_name="created_accounting_records")
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updated_at = models.DateTimeField(
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auto_now_add=True, db_column="updated")
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updated_by = models.ForeignKey(
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settings.AUTH_USER_MODEL, on_delete=models.PROTECT,
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db_column="updatedby",
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related_name="updated_accounting_records")
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@property
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def debit_amount(self):
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"""The debit amount of this accounting record"""
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return self.amount if not self.is_credit else None
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@property
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def credit_amount(self):
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"""The credit amount of this accounting record"""
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return self.amount if self.is_credit else None
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@property
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def accumulative_balance(self):
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return self._accumulative_balance
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@accumulative_balance.setter
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def accumulative_balance(self, value):
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self._accumulative_balance = value
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def __str__(self):
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"""Returns the string representation of this accounting
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record."""
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return "%s %s %s %s" % (
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self.transaction.date,
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self.subject.title_zhtw,
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self.summary,
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self.amount)
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class Meta:
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db_table = "accounting_records"
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ordering = ["is_credit", "ord"]
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