79 lines
3.4 KiB
Python
79 lines
3.4 KiB
Python
"""sales 序列化器（async 兼容）。"""
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from rest_framework import serializers
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from apps.core.serializers import AsyncModelSerializer
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from .models import SalesOrder, SalesOrderLine, SalesBill, SalesBillLine
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class SalesOrderLineSerializer(AsyncModelSerializer):
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product_code = serializers.CharField(source="product.code", read_only=True)
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product_name = serializers.CharField(source="product.name", read_only=True)
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class Meta:
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model = SalesOrderLine
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fields = ["id", "product", "product_code", "product_name",
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"quantity", "unit_price", "amount", "delivered_qty"]
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read_only_fields = ["id", "amount", "delivered_qty"]
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class SalesOrderSerializer(AsyncModelSerializer):
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customer_code = serializers.CharField(source="customer.code", read_only=True)
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warehouse_code = serializers.CharField(source="warehouse.code", read_only=True)
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lines = SalesOrderLineSerializer(many=True, required=False)
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class Meta:
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model = SalesOrder
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fields = [
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"id", "bill_no", "customer", "customer_code",
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"warehouse", "warehouse_code",
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"bill_date", "expected_date", "total_amount", "state", "remark",
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"lines",
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]
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read_only_fields = ["id", "bill_no", "total_amount", "state"]
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class SalesBillLineSerializer(AsyncModelSerializer):
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product_code = serializers.CharField(source="product.code", read_only=True)
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product_name = serializers.CharField(source="product.name", read_only=True)
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unit_name = serializers.SerializerMethodField()
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class Meta:
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model = SalesBillLine
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fields = ["id", "product", "product_code", "product_name",
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"quantity", "source_unit", "source_quantity", "unit_name",
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"unit_price", "amount", "tax_rate", "tax_amount"]
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read_only_fields = ["id", "amount", "tax_amount"]
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def get_unit_name(self, obj):
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unit = obj.source_unit or getattr(obj.product, "base_unit", None)
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return unit.name if unit else ""
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class SalesBillSerializer(AsyncModelSerializer):
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customer_code = serializers.CharField(source="customer.code", read_only=True)
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customer_name = serializers.CharField(source="customer.name", read_only=True)
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warehouse_code = serializers.CharField(source="warehouse.code", read_only=True)
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round_off = serializers.DecimalField(max_digits=18, decimal_places=4, read_only=True)
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# 单据税额合计 = 各行 tax_amount 之和（D4；前端展示"其中税额"）
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tax_total = serializers.SerializerMethodField()
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lines = SalesBillLineSerializer(many=True, required=False)
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def get_tax_total(self, obj):
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"""在内存里汇总已预取的行，避免每张单一次 aggregate（N+1）。
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旧实现 `obj.lines.aggregate(Sum("tax_amount"))` 对列表页的每一行都发一条 SQL
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（实测 50 张单 = 50 次聚合）。列表接口已 prefetch `lines`，
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这里直接遍历内存对象即可。详情接口若未预取，all() 也只多一次查询。
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"""
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return str(sum((ln.tax_amount or 0) for ln in obj.lines.all()))
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class Meta:
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model = SalesBill
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fields = [
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"id", "bill_no", "customer", "customer_code", "customer_name",
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"warehouse", "warehouse_code", "order",
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"bill_date", "total_amount", "round_off", "tax_total", "state", "remark",
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"lines",
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]
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read_only_fields = ["id", "bill_no", "total_amount", "state"]
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