How to scan int64 array from postgresql database

[clot27]

Hi, I am working the GORM and postgresql database. What I want is to scan []int64 from the database into a variable, I tried to use db.Model().Scan() but it didnt worked so I came across db.Model().Pluck() method and after reading the related docs I saw it is used to scan []int64 values, I thought I got my solution but it didnt worked either, I enabled log mode and here's what I found:
My db schema struct:

// Giveaway struct represents the giveaway table in the database.
type Giveaway struct {
	Name            string `gorm:"primaryKey"`
	ChatId          int64
	MessageId       int64
	MessageThreadId int64 `gorm:"default:0"`
	Prize           string
	Winners         int8
	Host            int64
	Participants    []int64 `gorm:"type:integer[];default:'{}'::integer[]"`
}

Entering a new value in db (without participants as it defaults to empty array):

giveaway := Giveaway{Name: name, ChatId: chat, MessageId: msg.MessageId, Prize: prize, Winners: winners, Host: host}
db.Create(&giveaway)

// This produces following error, idk why
sql: Scan error on column index 1, name "participants": unsupported Scan, storing driver.Value type []uint8 into type *[]int64 

Scanning for the participants array:

var participants []int64
db.Model(&Giveaway{}).Where("chat_id = ?", ChatId).Where("message_id = ?", MessageId).Pluck("participants", &participants)

// This produces following error
sql: Scan error on column index 0, name "participants": converting driver.Value type []uint8 ("{}") to a int64: invalid syntax 

What can I do to solve these errors?

[clot27]

I found instead of declaring the db schema's Participants column as type []int64, I can declare it as pq.Int64Array. It solved all problems. Also I can use .Scan() normally after this (just change the type of variables to Giveaway). But I still would like to know why this doesnt worked with .Pluck() setup?