forked from erp-dev/erp
134 lines
4.9 KiB
Python
134 lines
4.9 KiB
Python
from . import models
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from django.db.models import Sum
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from django.utils import timezone
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from sse.services import push_simple_message_with_object_id
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import logging
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logger = logging.getLogger(__name__)
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def find_inventory(product_id: int, warehouse_id: int) -> models.Inventory | None:
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"""根据产品ID和仓库ID查找库存记录"""
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try:
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inventory = models.Inventory.objects.get(
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product_id=product_id,
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warehouse_id=warehouse_id,
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)
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return inventory
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except models.Inventory.DoesNotExist:
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return None
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def create_stock_snapshot(stock_change_detail: models.StockChangeDetail, inventory: models.Inventory) -> models.StockSnapshot:
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"""创建库存快照记录"""
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if not stock_change_detail or stock_change_detail.id is None:
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raise ValueError("无效的库存变动明细记录")
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delta = stock_change_detail.quantity if stock_change_detail.stock_change_record.is_incoming else -stock_change_detail.quantity
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rolls_delta = 1 if stock_change_detail.stock_change_record.is_incoming else -1
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# 必须在库存变动发生后创建快照
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snapshot = models.StockSnapshot(
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merchant_id=stock_change_detail.merchant_id,
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product_id=inventory.product_id,
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warehouse_id=inventory.warehouse_id,
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delta=delta,
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quantity_before=inventory.quantity - delta,
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quantity_after=inventory.quantity,
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stock_change_record_id=stock_change_detail.stock_change_record.id,
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unit=stock_change_detail.unit,
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num_of_rolls=inventory.num_of_rolls + rolls_delta,
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)
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snapshot.save()
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logger.info(
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f'创建库存快照，库存ID: {inventory.id}, 数量: {inventory.quantity}, '
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f'匹数: {inventory.num_of_rolls}'
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)
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return snapshot
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def make_stock_change_completed(stock_change_record: models.StockChangeRecord) -> bool:
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"""处理库存变动完成后的逻辑, 实际扣减库存也在这里发生"""
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# TODO: 这里可以添加事务处理以确保数据一致性
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if not stock_change_record or stock_change_record.id is None:
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# 无效的库存变动记录
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return False
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if stock_change_record.is_finished:
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return True
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# TODO: 逻辑更改 = 出入库单现在不记录库存总量了
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# 需要根据产品分别统计变动数量（要考虑不同单位）
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for detail in stock_change_record.details.all():
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detail: models.StockChangeDetail
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logger.info(
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f'处理库存变动明细，产品ID: {detail.product_id}, '
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f'数量: {detail.quantity}, 单位: {detail.get_unit_display()}'
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)
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inventory_record = find_inventory(
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product_id=detail.product_id,
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warehouse_id=stock_change_record.warehouse_id,
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)
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# 确定方向
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positive = 1 if stock_change_record.is_incoming else -1
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if inventory_record:
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# 更新现有库存记录
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inventory_record.quantity += detail.quantity * positive
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inventory_record.num_of_rolls += positive
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logger.info(
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f'更新库存记录 {inventory_record.id}，新数量: {inventory_record.quantity}, '
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f'新匹数: {inventory_record.num_of_rolls}'
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)
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else:
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# 创建新库存记录
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inventory_record = models.Inventory(
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merchant_id=stock_change_record.merchant_id,
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product_id=detail.product_id,
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warehouse_id=stock_change_record.warehouse_id,
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quantity=detail.quantity * positive,
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num_of_rolls=1 if stock_change_record.is_incoming else -1,
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)
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logger.info(
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f'创建新库存记录 {inventory_record.id}，数量: {inventory_record.quantity}, '
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f'匹数: {inventory_record.num_of_rolls}'
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)
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inventory_record.save()
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# 发送库存变动通知
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push_simple_message_with_object_id(
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event_type='stock_change',
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message=f'产品ID {detail.product_id} 位于 {stock_change_record.warehouse_id} 的库存已更新',
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object_id=inventory_record.id
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)
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# 无论库存记录原本是否存在都创建库存快照
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create_stock_snapshot(detail, inventory_record)
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# 所有明细处理完毕，标记库存变动记录为已完成
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stock_change_record.is_finished = True
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stock_change_record.finished_at = timezone.now()
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stock_change_record.save()
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logger.info(
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f'库存变动记录 {stock_change_record.id} 标记为已完成。'
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)
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return True
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def get_frozen_stock_count(product_id: int, warehouse_id: int) -> int:
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"""获取指定产品在指定仓库的冻结库存数量"""
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total_frozen = models.StockFreeze.objects.filter(
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product_id=product_id,
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warehouse_id=warehouse_id,
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status=models.StockFreezeStatusEnum.FROZEN
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).aggregate(total=Sum('quantity'))['total'] or 0
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return total_frozen
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