feat: completed development wecom message

services/wecom/internal/logic/message/utils/review_change.go

@@ -0,0 +1,65 @@
+package utils
+
+import (
+	"fmt"
+	"strconv"
+
+	jsoniter "github.com/json-iterator/go"
+
+	"lone-services/pkg/modelbase"
+	"lone-services/pkg/utils"
+	"lone-services/services/wecom/internal/dao"
+	"lone-services/services/wecom/internal/model"
+)
+
+// GetLatestReviewChange 按业务类型+业务ID取最新一条变更快照
+func GetLatestReviewChange(bizType uint8, bizId int64) (*dao.ReviewChange, error) {
+	var change dao.ReviewChange
+	err := model.ReviewChangeModel{}.Init().GetOne(modelbase.Params{
+		Eq: map[string]string{
+			"type":   strconv.FormatUint(uint64(bizType), 10),
+			"biz_id": strconv.FormatInt(bizId, 10),
+		},
+		Order: "id desc",
+	}, &change)
+	if err != nil {
+		return nil, err
+	}
+	if change.Id < 1 {
+		return nil, fmt.Errorf("review change not found")
+	}
+	return &change, nil
+}
+
+// DiffContent 拼成旧 diff 逻辑使用的 {"old":...,"new":...} JSON
+func DiffContent(change *dao.ReviewChange) string {
+	before := change.BeforeData
+	after := change.AfterData
+	if before == utils.StringEmpty {
+		before = "null"
+	}
+	if after == utils.StringEmpty {
+		after = "null"
+	}
+	return fmt.Sprintf(`{"old":%s,"new":%s}`, before, after)
+}
+
+// BizFieldFromChange 从 after/before JSON 中取展示字段（如 name、type_name）
+func BizFieldFromChange(change *dao.ReviewChange, field string) string {
+	if change == nil || field == utils.StringEmpty {
+		return utils.StringEmpty
+	}
+	for _, raw := range []string{change.AfterData, change.BeforeData} {
+		if raw == utils.StringEmpty {
+			continue
+		}
+		var m map[string]any
+		if err := jsoniter.Unmarshal([]byte(raw), &m); err != nil {
+			continue
+		}
+		if v, ok := m[field].(string); ok && v != utils.StringEmpty {
+			return v
+		}
+	}
+	return utils.StringEmpty
+}