Scanning into struct of gorm query - go

Question

I'm trying to scan the result of a query into a res structure.
The code builds and the query passes but the result array consists of default values like this:
[{0 0 0} {0 0 0} {0 0 0} {0 0 0} {0 0 0} {0 0 0}]
Also, result array has the exact length as the query result should have.
When i try generated query in postgres shell it returns the result correctly.
Code:
type res struct{
id int
number int
user_id int
}
func getDataJoin(){
new := []res{}
db.Db.Table("users").Select("users.id as id, credit_cards.number as number, credit_cards.user_id as user_id").Joins("left join credit_cards on credit_cards.user_id = users.id").Scan(&new)
fmt.Println("user\n",new)
}
Generated Query:
SELECT users.id as id, credit_cards.number as number, credit_cards.user_id as user_id FROM "users" left join credit_cards on credit_cards.user_id = users.id
Database result
id | number | user_id
----+--------+---------
1 | 1 | 1
1 | 2 | 1
2 | 1 | 2
2 | 2 | 2
3 | 1 | 3
3 | 2 | 3
(6 rows)

Answer 1

Since go-gorm has a certain convention when it comes to naming, you might want to try two things.
Make your res struct publicly available, with public fields:
type Res struct{
ID int
Number int
UserID int
}
Or, specify mappings between columns and fields:
type res struct{
id int `gorm:"column:id"`
number int `gorm:"column:number"`
user_id int `gorm:"column:user_id"`
}

Answer 2

gorm can only read/write on exported fields much like Marshal/Unmarshal methods of json package. If the first letter of your field is in capital, it will be used. By default, gorm matches struct fields with their camel-cased forms. You can also define your own column names.
Since camel-cased form of both ID and Id, is id, as long as the first letter of your field is in capital, it should work. On a different note, it's good practice to write ID, i.e., both letter capital.