Scanning hash fields

Commands that return multiple keys and values provide a helper to scan results into a struct, for example, such commands as HGetAll, HMGet, and MGet.

You can use redis struct field tag to change field names or completely ignore some fields:

type Model struct {
	Str1    string   `redis:"str1"`
	Str2    string   `redis:"str2"`
	Int     int      `redis:"int"`
	Bool    bool     `redis:"bool"`
	Ignored struct{} `redis:"-"`
}

Because go-redis does not provide a helper to save structs in Redis, we are using a pipeline to load some data into our database:

rdb := redis.NewClient(&redis.Options{
	Addr: ":6379",
})

if _, err := rdb.Pipelined(ctx, func(rdb redis.Pipeliner) error {
	rdb.HSet(ctx, "key", "str1", "hello")
	rdb.HSet(ctx, "key", "str2", "world")
	rdb.HSet(ctx, "key", "int", 123)
	rdb.HSet(ctx, "key", "bool", 1)
	return nil
}); err != nil {
	panic(err)
}

After that we are ready to scan the data using HGetAll:

var model1 Model
// Scan all fields into the model.
if err := rdb.HGetAll(ctx, "key").Scan(&model1); err != nil {
	panic(err)
}

Or HMGet:

var model2 Model
// Scan a subset of the fields.
if err := rdb.HMGet(ctx, "key", "str1", "int").Scan(&model2); err != nil {
	panic(err)
}

You can also find the example above on GitHubopen in new window.