gocqlx Updatebuilder and get wrong result - cassandra

Question

first, my table design are follow:
create table io
(
qa text primary key,
created_at text,
messages list<frozen<message>>,
reply boolean,
resolve boolean,
updated_at text,
user text,
uuid uuid
)
and my message of UDT
create type message
(
time text,
who tinyint,
content text,
images map<text, blob>
);
my struct in golang are follow:
type Questions []Question
type Question struct {
Uuid gocql.UUID `json:"uuid"`
User string `json:"user"`
Reply bool `json:"reply"`
Qa string `json:"qa"`
CreatedAt string `json:"created_at"`
UpdatedAt string `json:"updated_at"`
Resolve bool `json:"resolve"`
Messages Messages `json:"messages"`
}
type Messages []Message
type Message struct {
Time string `json:"time"`
Who int `json:"who"`
Content string `json:"content"`
Images map[string]string `json:"images"`
}
I use package of gocqlx to build my query,and insert data seems look like correct
...strat the session
...set meta table
...append message to messages (slice of message)
...finally, I run the this
if err := s.Query(t.UpdateBuilder().Add("messages").Set("updated_at").ToCql()).BindStruct(q).ExecRelease(); err != nil {
log.Println("Send message error: ", err)
}
print this query session.Query(table.UpdateBuilder().Add("messages").Set("updated_at").ToCql()).BindStruct(question)
[query statement="UPDATE io SET messages=messages+?,updated_at=? WHERE qa=? " values=[[{Time:2020-05-23 22:15:10+0800 Who:0 Content:yah yah yah Images:map[]}] 2020-05-23 22:15:10+0800 20200523221510]
that will be right on executed. but when I check data in cassandra.
I look null list value
| qa | created_at | messages
------------------------------------------------------------------------------------------
|20200523221510 |2020-05-23 22:15:10+0800| [{time:NULL,who:NULL,content:NULL,images:{}}]
where's wrong ?

Answer 1

Your struct needs to have a cql tag. Something like:
type Questions []Question
type Question struct {
Uuid gocql.UUID `json:"uuid" cql:"uuid"`
// ...
}