How Can I Store a Slice of Strings as JSONB in Postgres Using GORM and pgtype.JSONB?

Using pgtype.JSONB to Save a Slice of Strings as JSONB with GORM and Postgres

GORM users may encounter challenges when attempting to store a slice of strings as a JSONB object in Postgres without relying on the GORM-specific type (postgres.Jsonb). This article delves into a solution that utilizes pgtype.JSONB to overcome these difficulties.

When utilizing GORM with pgx, you can leverage the pgtype package to represent JSONB data types. This package offers the pgtype.JSONB type, which provides a convenient solution for managing JSONB fields in your Go structs.

To implement this method, simply define your struct as follows:

// User represents a GORM model
type User struct {
    gorm.Model
    Data pgtype.JSONB `gorm:"type:jsonb;default:'[]';not null"`
}

In this example, the Data field is defined as pgtype.JSONB.

Accessing JSONB Values

To retrieve the value of the Data field from the database, you can use the AssignTo method:

u := User{}
db.Find(&u)

var data []string
err := u.Data.AssignTo(&data)
if err != nil {
    log.Fatal(err)
}

Setting JSONB Values

To update the Data field in the database, use the Set method:

u := User{}
err := u.Data.Set([]string{"abc", "def"})
if err != nil {
    return
}

db.Updates(&u)

This approach leverages the underlying driver's capabilities, eliminating the need for custom code and enabling the seamless handling of any JSONB type, not just []string.

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