Scan []struct

[pablor21]

Hello!
Is there some way to scan MGET to slice of objects?

I'm trying like this:

// struct to be scanned
type S struct{
ID string
Name string
}

var res []*S
keys:=[]string{}{"1", "2"}
redis.MGet(ctx, keys...).Scan(&res)

It's giving me an error:
redis.Scan(non-pointer []*S)

[monkey92t]

See:

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

func main() {
	ctx := context.Background()

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

	// Set some fields.
	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)
	}

	var model1, model2 Model

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

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

	spew.Dump(model1)
	spew.Dump(model2)
}

[ndyakov]

Oh, I think @pablor21 is looking for

go-redis/string_commands.go

Line 121 in cb3aa19

func (c cmdable) MGet(ctx context.Context, keys ...string) *SliceCmd {

and not HMGet.

[monkey92t]

The mget command returns a slice, and converting it into a struct is not a common practice. For example, in Go, it’s rare to convert a []string into a struct. On the other hand, converting a hash into a struct is much more common.