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from django.db import transaction
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from django.db.models import Sum
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from rest_framework import serializers
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from rest_framework.exceptions import ValidationError
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from ERP_5.utils.get_inventory import get_inventory_by_goods
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from sale_info.models import SaleModel, SaleItemModel
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from warehouse_info.models import SaleDeliverItemModel
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class SalesItemSerializer(serializers.ModelSerializer):
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"""
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销售单的 项目，序列化
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"""
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# 注意：既然只有 库存数据没有，那么可以增加一个属性
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cur_inventory = serializers.SerializerMethodField(read_only=True, label='当前仓库中库存')
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# 额外增加的属性，为了后面的订单出库单。already_out_number：已经出库数量
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already_out_number = serializers.SerializerMethodField(read_only=True, label='当前的销售订单中，已经出库的数量')
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class Meta:
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model = SaleItemModel
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fields = '__all__'
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def get_cur_inventory(self, obj): # 当前的obj为：SaleItemModel对象
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result = get_inventory_by_goods(obj.goods.id)
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return result if result else 0
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def get_already_out_number(self, obj): # 当前的obj为：SaleItemModel对象
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if obj.sale.status == '0' or obj.sale.status == '1':
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# 如果销售订单都没有出库，则不用查了，直接返回0
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return 0
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else:
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# 先根据销售单的ID作为一个过滤条件, 基于当前货品ID作为第二个过滤条件， 而且出库单的状态是已经审核
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out_count = SaleDeliverItemModel.objects.filter(
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sale_deliver__sale__id=obj.sale.id,
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goods_id=obj.goods.id).exclude(sale_deliver__status='0') \
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.aggregate(sum=Sum('sale_count'))
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if out_count:
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return out_count['sum'] if out_count['sum'] else 0
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return 0
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class SaleSerializer(serializers.ModelSerializer):
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"""
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销售单——反序列化器（用于新增和修改） 和 查询列表的序列化器（用于入库单列表）
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"""
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item_list = SalesItemSerializer(many=True)
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# 销售订单列表中需要展示：商品信息。
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goods_info = serializers.SerializerMethodField(read_only=True, label='列表中展示的商品信息')
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class Meta:
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model = SaleModel
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fields = '__all__'
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def get_goods_info(self, obj):
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"""
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商品信息是由： 商品1名称 商品1规格 , 商品2名称 商品2规格 ，....
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"""
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if obj.item_list.all():
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result = []
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for item in obj.item_list.all():
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result.append(item.name + (item.specification if item.specification else ''))
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return ', '.join(result)
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return ""
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# 同时插入销售单和销售单中货品项。必须重写create
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def create(self, validated_data):
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item_list = validated_data.pop('item_list')
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with transaction.atomic():
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sale = SaleModel.objects.create(**validated_data)
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for item in item_list:
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sale_item = SaleItemModel.objects.create(sale=sale, **item)
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# 把一些冗余属性也加进去
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goods = item.get('goods')
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sale_item.specification = goods.specification
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sale_item.model_number = goods.model_number
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sale_item.number_code = goods.number_code
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sale_item.color = goods.color
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sale_item.units = goods.units
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sale_item.units_name = goods.units.basic_name
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sale_item.save()
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return sale
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# 同时插入销售单和销售单中货品项。必须重写update
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def update(self, instance, validated_data):
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if instance.status == '1':
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raise ValidationError("销售单已经生效，不能修改")
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item_list = validated_data.pop('item_list')
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old_list = instance.item_list.all()
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with transaction.atomic():
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if old_list.exists():
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# 然后把旧数据删除，因为在validated_data拿不到货品库存数据的ID
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instance.item_list.all().delete()
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for item in item_list: # 重新插入销售项 数据
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sale_item = SaleItemModel.objects.create(sale=instance, **item)
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# 把一些冗余属性也加进去
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goods = item.get('goods')
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sale_item.specification = goods.specification
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sale_item.model_number = goods.model_number
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sale_item.number_code = goods.number_code
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sale_item.color = goods.color
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sale_item.units = goods.units
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sale_item.units_name = goods.units.basic_name
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sale_item.save()
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result = super(SaleSerializer, self).update(instance=instance, validated_data=validated_data)
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return result
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