Is there a way to remove the RETURNING clause while creating records with go-gorm?

Question

I'm using go-gorm with a postgres 11 DB and facing an issue where I need to remove the RETURNING clause entirely when creating records (that statement seems to be included by default). I just want to insert records and get nothing back, except for errors. I have some complex relations on the database that won't support RETURNING statements, so when I try to insert like this: (made code simpler for brevity)

type Cargo struct {
    Id   int64 `gorm:"primaryKey"`
    Name string
}
dsnString := fmt.Sprintf("host=%s ...") 
db, _ := gorm.Open(postgres.New(postgres.Config{DSN: dsnString}), &gorm.Config{})

cargo := Cargo{Name: "test"}
db.Create(cargo)

I get the error "ERROR: cannot perform INSERT RETURNING on relation Cargo".

I tried creating the db connection with the parameter WithoutReturning: true:

db, _ := gorm.Open(postgres.New(postgres.Config{DSN: dsnString, , WithoutReturning: true}), &gorm.Config{})

But then when I try db.Create(cargo) I get a different error: "LastInsertId is not supported by this driver". It seems to be still trying to get the last inserted id anyway.

In go-pg I could use db.Model(x).Returning("null").Insert(cargo) but I couldn't find a way to do it with go-gorm. Any help is greatly appreciated.

Answer 1

The only two ways that I can get gorm to not use the RETURNING clause with postgres are

A model that does not declare a primary key

That means getting rid of the field that is named ID/Id or any tagged gorm:"primaryKey".

type Cargo struct {
    Name string
}
db.Create(&Cargo{Name: "Test"})

Using Create from map with Table()

In this case you would represent your model as a map[string]interface{} instead of as a struct and use it like this:

db.Table("cargos").Create(map[string]interface{}{
    "name": "Test",
})

As it stands gorm doesn't support this use case very well. If you can't restructure your views to support RETURNING and these options aren't doing it for you, I suggest adding a feature request in the gorm repo.

Answer 2

You can modify the default returning behavior with

db.Clauses(clause.Returning{}).Create(&cargo)

Here the doc link: https://gorm.io/docs/update.html#Returning-Data-From-Modified-Rows