I'm trying to bulid a REST API using go and specifically GORM.
My entities look like this:
type Business struct { ID string `json:"id" gorm:"primaryKey;not null;type:uuid;default:gen_random_uuid()"` CreatedAt time.Time `json:"-"` UpdatedAt time.Time `json:"-"` Email string `json:"email" gorm:"uniqueIndex;not null;"` Password []byte `json:"-"` Name string `json:"name"` Promos []Promo `json:"promos" gorm:"foreignKey:CompanyID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE"`}type Promo struct { PromoID string `json:"id" gorm:"primaryKey;not null;type:uuid;default:gen_random_uuid()"` CompanyID string `json:"company_id" gorm:"not null;foreignKey:ID"` CreatedAt time.Time `json:"-"` UpdatedAt time.Time `json:"-"` Target Target `json:"target" gorm:"foreignKey:TargetID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"` Active bool `json:"-" gorm:"default:true"` ActiveFrom time.Time `json:"active_from"` ActiveUntil time.Time `json:"active_until"` Description string `json:"description" gorm:"not null"` ImageURL string `json:"image_url"` MaxCount int `json:"max_count" gorm:"not null"` Mode string `json:"mode" gorm:"not null"` PromoCommon string `json:"promo_common"` PromoUnique []PromoUnique `json:"promo_unique" gorm:"foreignKey:PromoUniqueID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE"`}type PromoUnique struct { PromoUniqueID string `json:"-" gorm:"primaryKey;not null;type:uuid;default:gen_random_uuid()"` Body string `json:"-" gorm:"not null"` Activated bool `json:"-" gorm:"default:false"`}type Target struct { TargetID string `json:"-" gorm:"primaryKey;not null;type:uuid;default:gen_random_uuid()"` AgeFrom int `json:"age_from"` AgeUntil int `json:"age_until"` Country countries.CountryCode `json:"country"` Categories []Category `json:"categories" gorm:"foreignKey:CategoryID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE"`}type Category struct { CategoryID string `json:"id" gorm:"primaryKey;not null;type:uuid;default:gen_random_uuid()"` TargetID string `json:"-" gorm:"not null"` Name string `json:"name" gorm:"not null"`}My service's code looks like this:
func (s *promoService) Create(ctx context.Context, promoDTO dto.PromoCreate) (*entity.Promo, error) { activeFrom, _ := time.Parse("2006-01-02", promoDTO.ActiveFrom) activeUntil, _ := time.Parse("2006-01-02", promoDTO.ActiveUntil) var categories []entity.Category var promoUniques []entity.PromoUnique for _, category := range promoDTO.Target.Categories { categories = append(categories, entity.Category{ Name: category, }) } for _, promoUnique := range promoDTO.PromoUnique { promoUniques = append(promoUniques, entity.PromoUnique{ Body: promoUnique, }) } company, _ := s.businessStorage.GetByID(ctx, promoDTO.CompanyID) promo := entity.Promo{ Target: entity.Target{ AgeFrom: promoDTO.Target.AgeFrom, AgeUntil: promoDTO.Target.AgeUntil, Country: countries.ByName(strings.ToUpper(promoDTO.Target.Country)), Categories: categories, }, CompanyID: company.ID, Active: true, ActiveFrom: activeFrom, ActiveUntil: activeUntil, Description: promoDTO.Description, ImageURL: promoDTO.ImageURL, MaxCount: promoDTO.MaxCount, Mode: promoDTO.Mode, PromoCommon: promoDTO.PromoCommon, PromoUnique: promoUniques, } company.Promos = append(company.Promos, promo) _, err := s.businessStorage.Update(ctx, company) if err != nil { return nil, err } return s.promoStorage.Create(ctx, promo)}My storage looks like this:
// Create is a method to create a new Promo in database.func (s *promoStorage) Create(ctx context.Context, promo entity.Promo) (*entity.Promo, error) { err := s.db.Model(&promo).WithContext(ctx).Create(&promo).Error return &promo, err}But when I try to reach an endpoint I get this error:
/opt/internal/adapters/database/postgres/promo.go:22 ERROR: insert or update on table "promos" violates foreign key constraint "fk_businesses_promos" (SQLSTATE 23503) What should I do? I've researched some other questions on stackoverflow with the same issue, but none helped me.