Load model with with association - go

Question

I would like to load the post and is author id and email without loading anything else.
It doesn't need to be eager loading I just need to get all posts and include only the authors id and username
My current query
posts := []interfaces.Post{}
db.Model("User").Find(&posts)
type Post struct{
gorm.Model
Title string
Body string
UserID uint
User User
}
type User struct{
gorm.Model
Username string
Email string
Password string
}
Current response
{
"ID": 1,
"CreatedAt": "2021-01-09T19:11:42.063274-05:00",
"UpdatedAt": "2021-01-09T19:11:42.063274-05:00",
"DeletedAt": null,
"Title": "What does the fox say",
"Body": "whawhhwjg",
"UserID": 1,
"User": {
"ID": 1,
"CreatedAt": "2021-01-09T19:01:28.70267-05:00",
"UpdatedAt": "2021-01-09T19:01:28.70267-05:00",
"DeletedAt": null,
"Username": "12345",
"Email": "1112#gmail.com",
"Password": "$2a$04$T1841Dc52MwjSJ2PaPnTwuFASai6zkGw8WFcuQbO1fi9Nug7R3Iqq"
}
},
Response I'm looking for
{
"ID": 1,
"CreatedAt": "2021-01-09T19:11:42.063274-05:00",
"UpdatedAt": "2021-01-09T19:11:42.063274-05:00",
"DeletedAt": null,
"Title": "What does the fox say",
"Body": "whawhhwjg",
"UserID": 1,
"User": {
"ID": 1,
"Username": "12345",
}
},

Answer 1

You can use the Select method to select the specific fields.
dm.Model("User").Select("ID", "Email", "Username").Find(&posts)
Or, you can use the Preload method like this.
db.Preload("User", func (db *gorm.DB) *gorm.DB {
return db.Select("ID", "Email", "Username")
}).
Find(&posts)

Answer 2

You can also do it in this way
db.Preload("User").Select("ID", "Username").Find(&posts)