forked from erp-dev/erp
225 lines
7.5 KiB
Python
225 lines
7.5 KiB
Python
from django.db import models
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from django.core.exceptions import ValidationError
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from flower.common import ModelBase
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from basic_info import models as basic_info_models
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import decimal
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class PurchaseOrder(ModelBase):
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"""采购单模型"""
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id = models.BigAutoField(primary_key=True)
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supplier = models.ForeignKey(basic_info_models.Supplier, on_delete=models.PROTECT, related_name='purchase_orders', verbose_name='供应商')
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order_date = models.DateField(verbose_name='订单日期')
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total_amount = models.DecimalField(max_digits=15, decimal_places=2, verbose_name='总金额')
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remarks = models.TextField(blank=True, null=True, verbose_name='备注')
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def __str__(self):
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return f'采购订单 {self.id} - {self.supplier.name}'
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class Meta:
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verbose_name = '采购单'
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verbose_name_plural = '采购单'
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class StockChangeSourceEnum(models.IntegerChoices):
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"""库存变动来源类型"""
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PURCHASE = 1, '采购'
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SALES_RETURN = 2, '销退'
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TRANSPORT_IN = 3, '调入'
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RECHECK_ADD = 4, '盘盈'
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SALES = 5, '销售'
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PURCHASE_RETURN = 6, '采购退货'
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TRANSPORT_OUT = 7, '调出'
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RECHECK_REMOVE = 8, '盘亏'
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class StockChangeTypeEnum(models.IntegerChoices):
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"""库存变动类型"""
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ADD = 1, '入库'
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REMOVE = 2, '出库'
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class StockChangeRecord(ModelBase):
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"""库存变动记录模型"""
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id = models.BigAutoField(primary_key=True)
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type = models.IntegerField(choices=StockChangeTypeEnum.choices, verbose_name='变动类型')
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product = models.ForeignKey(
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basic_info_models.Product,
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on_delete=models.PROTECT,
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related_name='stock_change_records',
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verbose_name='产品',
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)
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warehouse = models.ForeignKey(
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basic_info_models.WareHouse,
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on_delete=models.PROTECT,
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related_name='stock_change_records',
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verbose_name='仓库',
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)
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source_type = models.IntegerField(
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choices=StockChangeSourceEnum.choices,
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verbose_name='变动来源',
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)
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unit = models.IntegerField(
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verbose_name='单位',
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choices=basic_info_models.ProductUnitEnum.choices,
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)
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num_of_rolls = models.IntegerField(
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default=1,
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verbose_name='匹数',
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)
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created_by = models.ForeignKey(
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'auth.User',
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on_delete=models.PROTECT,
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null=True,
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blank=True,
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verbose_name='操作人',
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)
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quantity = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='数量')
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source_id = models.BigIntegerField(null=True, blank=True, verbose_name='来源单据ID')
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is_finished = models.BooleanField(default=False, verbose_name='完成出入库')
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finished_at = models.DateTimeField(null=True, blank=True, verbose_name='完成时间')
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remarks = models.TextField(blank=True, null=True, verbose_name='备注')
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def __str__(self):
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return f'出入库记录 {self.id} - 仓库：{self.warehouse.name} - 产品: {self.product.name}'
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class Meta:
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verbose_name = '出入库记录'
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verbose_name_plural = '出入库记录'
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def clean(self):
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if self.type == StockChangeTypeEnum.ADD:
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if self.source_type > 4:
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raise ValidationError('入库记录的来源类型无效')
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elif self.type == StockChangeTypeEnum.REMOVE:
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if self.source_type < 5:
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raise ValidationError('出库记录的来源类型无效')
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def save(self, *args, **kwargs):
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self.full_clean()
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super().save(*args, **kwargs)
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@property
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def is_incoming(self) -> bool:
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"""判断是否为入库记录"""
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return self.type == StockChangeTypeEnum.ADD
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@property
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def is_outgoing(self) -> bool:
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"""判断是否为出库记录"""
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return self.type == StockChangeTypeEnum.REMOVE
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@property
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def delta(self) -> decimal.Decimal:
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"""计算库存变动的数量增减"""
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# 入库为正，出库为负
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if self.type == StockChangeTypeEnum.ADD:
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return self.quantity
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elif self.type == StockChangeTypeEnum.REMOVE:
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return -self.quantity
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else:
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raise ValueError("未知的库存变动类型")
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class Inventory(ModelBase):
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"""库存模型"""
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id = models.BigAutoField(primary_key=True)
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product = models.ForeignKey(
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basic_info_models.Product,
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on_delete=models.PROTECT,
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related_name='inventories',
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verbose_name='产品',
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)
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warehouse = models.ForeignKey(
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basic_info_models.WareHouse,
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on_delete=models.PROTECT,
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related_name='inventories',
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verbose_name='仓库',
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)
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quantity = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='库存数量')
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num_of_rolls = models.IntegerField(default=1, verbose_name='匹数')
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minimum_quantity = models.IntegerField(null=True, blank=True, verbose_name='最低库存量')
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spec = models.CharField(max_length=100, blank=True, null=True, verbose_name='规格')
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description = models.TextField(blank=True, null=True, verbose_name='备注描述')
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def __str__(self):
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return f'库存 {self.product.name} - 仓库: {self.warehouse.name}'
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class Meta:
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verbose_name = '库存'
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verbose_name_plural = '库存'
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unique_together = ('product', 'warehouse')
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class StockSnapshot(ModelBase):
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"""库存变动快照模型"""
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id = models.BigAutoField(primary_key=True)
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product = models.ForeignKey(
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basic_info_models.Product,
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on_delete=models.PROTECT,
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related_name='stock_snapshots',
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verbose_name='产品',
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)
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warehouse = models.ForeignKey(
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basic_info_models.WareHouse,
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on_delete=models.PROTECT,
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related_name='stock_snapshots',
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verbose_name='仓库',
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)
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delta = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='库存变动数量')
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quantity_before = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='变动前库存数量')
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quantity_after = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='变动后库存数量')
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stock_change_record = models.ForeignKey(
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StockChangeRecord,
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on_delete=models.PROTECT,
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related_name='stock_snapshots',
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verbose_name='关联的库存变动记录',
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)
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unit = models.IntegerField(
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verbose_name='单位',
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choices=basic_info_models.ProductUnitEnum.choices,
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)
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num_of_rolls = models.IntegerField(default=1, verbose_name='匹数')
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# offset_to表示该快照被冲抵到的目标快照ID
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# 当offset_to不为空时，cancelled不可为True 及 offset_id只能为空
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# 因为该记录是冲抵记录无法再取消，也不可能冲抵的同时被冲抵
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offset_to = models.BigIntegerField(
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null=True,
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blank=True,
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verbose_name='冲抵目标ID',
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)
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offset_at = models.DateTimeField(
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null=True,
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blank=True,
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verbose_name='冲抵时间',
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)
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# 当cancelled为True时，offset_id不可为空，表示该快照已被冲抵
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cancelled = models.BooleanField(default=False, verbose_name='已取消')
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cancelled_at = models.DateTimeField(
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null=True,
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blank=True,
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verbose_name='取消时间',
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)
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offset_id = models.BigIntegerField(
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null=True,
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blank=True,
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verbose_name='冲抵记录ID',
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)
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def __str__(self):
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return f'库存快照 {self.id} - 日期: {self.snapshot_date} - 产品: {self.product.name}'
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class Meta:
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verbose_name = '库存快照'
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verbose_name_plural = '库存快照'
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