优化mongo，封装count逻辑，处理objectId

consts/payment_terms.go

@@ -0,0 +1,52 @@
+package consts
+
+// PaymentTerms 支付条款枚举
+type PaymentTerms string
+
+const (
+	PaymentTermsNet30 PaymentTerms = "net_30" // 30天
+	PaymentTermsNet60 PaymentTerms = "net_60" // 60天
+	PaymentTermsNet90 PaymentTerms = "net_90" // 90天
+)
+
+// GetAllPaymentTerms 获取所有支付条款
+func GetAllPaymentTerms() []PaymentTerms {
+	return []PaymentTerms{
+		PaymentTermsNet30,
+		PaymentTermsNet60,
+		PaymentTermsNet90,
+	}
+}
+
+type PaymentTermsKeyValue struct {
+	Key   PaymentTerms
+	Value string
+}
+
+var (
+	PaymentTermsNet30KeyValue = PaymentTermsKeyValue{Key: PaymentTermsNet30, Value: "30天"}
+	PaymentTermsNet60KeyValue = PaymentTermsKeyValue{Key: PaymentTermsNet60, Value: "60天"}
+	PaymentTermsNet90KeyValue = PaymentTermsKeyValue{Key: PaymentTermsNet90, Value: "90天"}
+)
+
+func GetAllPaymentTermsKeyValue() []PaymentTermsKeyValue {
+	return []PaymentTermsKeyValue{
+		PaymentTermsNet30KeyValue,
+		PaymentTermsNet60KeyValue,
+		PaymentTermsNet90KeyValue,
+	}
+}
+
+var paymentTermsValueMap = map[PaymentTerms]string{
+	PaymentTermsNet30: PaymentTermsNet30KeyValue.Value,
+	PaymentTermsNet60: PaymentTermsNet60KeyValue.Value,
+	PaymentTermsNet90: PaymentTermsNet90KeyValue.Value,
+}
+
+func GetPaymentTermsValueByKey(key PaymentTerms) (value string) {
+	value, exists := paymentTermsValueMap[key]
+	if !exists {
+		value = "未知支付条款"
+	}
+	return
+}