How do I handle relationships in GORM?

How do I handle relationships in GORM?

Can you give me an example of a one-to-many relationship?

Sure! If you have a User struct and a Post struct, you can define it like this:

type User struct {
    gorm.Model
    Name  string
    Posts []Post `gorm:"foreignKey:UserID"`
}

type Post struct {
    gorm.Model
    Title  string
    UserID uint
}

This sets up a one-to-many relationship where a user can have multiple posts.

What about many-to-many relationships?

For many-to-many relationships, you need a join table. For example:

type User struct {
    gorm.Model
    Name  string
    Roles []Role `gorm:"many2many:user_roles;"`
}

type Role struct {
    gorm.Model
    Name  string
    Users []User `gorm:"many2many:user_roles;"`
}

This allows users to have multiple roles and roles to have multiple users.