Duplicate entry when creating an entity in many2many relationship

[nickbel7]

Description

I want to create a many2many relationship between a user and a house.

1. I create the following entities (the tables are created correctly) through the 'AutoMigrate' method
2. Then I go and create a House entity
3. Then I create a User entity and I reference the uuid of the previously created house.

PROBLEM: the user that gets created is not linked to the existing house through the link table('user_houses'). Instead, a new house entry is created with a new uuid, which then gets linked to the user.

Below I share the declaration of the entities hoping someone has struck on the same issue!

type UsersTable struct {
	ID                uuid.UUID       `gorm:"type:uuid;primaryKey"`
	Username          string          `json:"username" gorm:"not null"`
	Password          string          `json:"password" gorm:"not null"`
	Email             string          `json:"email"`
	Houses []*HousesTable `gorm:"many2many:user_houses;"`
}

type HousesTable struct {
	ID          uuid.UUID `gorm:"type:uuid;primaryKey"`
	Name        string    `json:"name" gorm:"not null"`
	Address     string    `json:"address"`
	Users       []*UsersTable  `gorm:"many2many:user_houses;"`
}

func (u *UsersTable) BeforeCreate(tx *gorm.DB) (err error) {
	u.ID = uuid.New()
	return
}

func (u *HousesTable) BeforeCreate(tx *gorm.DB) (err error) {
	u.ID = uuid.New()
	return
}

[github-actions]

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