_, err := c.Find(bson.M{"index": index}).Apply(mgo.Change{
Upsert: true,
ReturnNew: false,
Update: bson.M{"create_time": time.Now(), "update_time": time.Now(), "operation": 0, "$inc": bson.M{"req_cnt": 1}},
}, nil)
if err != nil {
return err
}
由于"$inc"和前面的update冲突，报错误：The dollar ($) prefixed field '$inc' in '$inc' is not valid for storage.
因此改为：
_, err := c.Find(bson.M{"index": index}).Apply(mgo.Change{
Upsert: true,
ReturnNew: false,
Update: bson.M{"$set": bson.M{"create_time": time.Now(), "update_time": time.Now(), "operation": 0}, "$inc": bson.M{"req_cnt": 1}},
}, nil)
if err != nil {
return err
}