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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 financial_info.models import PaymentItemModel, PaymentModel
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class PaymentItemSerializer(serializers.ModelSerializer):
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"""
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付款单中 付款项目 的序列化器
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"""
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# 查询当前采购入库单中已经支付金额
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already_payment = serializers.SerializerMethodField(read_only=True, help_text='已经付款的金额')
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class Meta:
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model = PaymentItemModel
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fields = '__all__'
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def get_already_payment(self, obj):
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"""
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查询当前采购入库单中已经支付金额
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:param obj: PaymentItemModel
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:return: 0获取其他的数值
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"""
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if obj.purchase_storage:
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pay_dict = PaymentItemModel.objects.filter(purchase_storage_id=obj.purchase_storage.id)\
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.exclude(payment__status='0')\
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.aggregate(sum=Sum('this_money'))
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if pay_dict:
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return pay_dict['sum'] if pay_dict['sum'] else 0
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return 0
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return 0
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class PaymentSerializer(serializers.ModelSerializer):
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"""
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付款单——序列化器
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"""
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item_list = PaymentItemSerializer(many=True, required=False)
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class Meta:
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model = PaymentModel
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fields = '__all__'
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def create(self, validated_data):
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if 'item_list' not in validated_data:
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return super(PaymentSerializer, self).create(validated_data)
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item_list = validated_data.pop('item_list')
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with transaction.atomic():
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payment = PaymentModel.objects.create(**validated_data)
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for item in item_list:
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# 插入付款项目
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PaymentItemModel.objects.create(payment=payment, **item)
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return payment
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# 必须重写update
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def update(self, instance, validated_data):
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if instance.status != '0':
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raise ValidationError("付款单已经生效，不能修改!")
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with transaction.atomic():
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if 'item_list' in validated_data:
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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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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: # 重新插入采购项 数据
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PaymentItemModel.objects.create(payment=instance, **item)
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result = super(PaymentSerializer, self).update(instance=instance, validated_data=validated_data)
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return result
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