优化mongo，封装count逻辑，处理objectId

consts/billing_model.go

@@ -0,0 +1,57 @@
+package consts
+
+// BillingModel 计费模式枚举
+type BillingModel string
+
+const (
+	BillingModelCPM      BillingModel = "cpm"       // 千次展示成本
+	BillingModelCPC      BillingModel = "cpc"       // 每次点击成本
+	BillingModelCPA      BillingModel = "cpa"       // 每次行动成本
+	BillingModelRevShare BillingModel = "rev_share" // 收入分成
+)
+
+// GetAllBillingModels 获取所有计费模式
+func GetAllBillingModels() []BillingModel {
+	return []BillingModel{
+		BillingModelCPM,
+		BillingModelCPC,
+		BillingModelCPA,
+		BillingModelRevShare,
+	}
+}
+
+type BillingModelKeyValue struct {
+	Key   BillingModel
+	Value string
+}
+
+var (
+	BillingModelCPMKeyValue      = BillingModelKeyValue{Key: BillingModelCPM, Value: "千次展示成本"}
+	BillingModelCPCKeypValue     = BillingModelKeyValue{Key: BillingModelCPC, Value: "每次点击成本"}
+	BillingModelCPAKeyValue      = BillingModelKeyValue{Key: BillingModelCPA, Value: "每次行动成本"}
+	BillingModelRevShareKeyValue = BillingModelKeyValue{Key: BillingModelRevShare, Value: "收入分成"}
+)
+
+func GetAllBillingModelKeyValue() []BillingModelKeyValue {
+	return []BillingModelKeyValue{
+		BillingModelCPMKeyValue,
+		BillingModelCPCKeypValue,
+		BillingModelCPAKeyValue,
+		BillingModelRevShareKeyValue,
+	}
+}
+
+var billingModelValueMap = map[BillingModel]string{
+	BillingModelCPM:      BillingModelCPMKeyValue.Value,
+	BillingModelCPC:      BillingModelCPCKeypValue.Value,
+	BillingModelCPA:      BillingModelCPAKeyValue.Value,
+	BillingModelRevShare: BillingModelRevShareKeyValue.Value,
+}
+
+func GetBillingModelValueByKey(key BillingModel) (value string) {
+	value, exists := billingModelValueMap[key]
+	if !exists {
+		value = "未知计费模式"
+	}
+	return
+}