Many to many association with structs - go

Question

I have this data structure here :
And I am having an issue linking the many-to-many association between Historique and Medicament. (History is all the time a patient went doctor, treatment are the treatment he received, medicament the medicament prescribed)
I have this code here and I can't find a way to link them with all these foreign keys !
type Traitement struct {
Histo_id int `gorm:"primary_key"`
Histo_patient_id int `gorm:"primary_key"`
Histo_medecin_id int `gorm:"primary_key"`
Medicament_id int `gorm:"primary_key"`
Debut_traitement string
Fin_traitement string
}
type Medicament struct {
ID int `gorm:"primary_key"`
Nom string `gorm:"column:medicament_nom"`
Description string `gorm:"column:medicament_desc"`
Historique []Historique `gorm:"many2many:tt_traitement"`
}
type Historique struct {
Fk_patient_id string `json:"-" gorm:"primary_key"`
Date_consultation string
Fk_maladie_id uint `json:"-" gorm:"primary_key"`
Fk_compte_medecin_id uint
Maladie Maladie `gorm:"ForeignKey:ID;AssociationForeignKey:Fk_maladie_id"`
Medicament []Medicament `gorm:"many2many:tt_traitement"`
}
func GetPatientWithDiseases(id uint) (*Patient, error) {
patient := &Patient{}
err := GetDB().Preload("Historique.Maladie").Preload("Historique.Traitement.Medicament").Find(&patient, id).Error
if err != nil {
return nil, err
}
return patient, nil
}
Thanks in advance for your help !

Answer 1

Ok, so after a lucky try, I had an error that led me to the good path.
I removed the Traitement struct, and the many_to_many and []Historique in the Medicament struct. I only kept:
type Historique struct {
ID int `gorm:"primary_key"`
Fk_patient_id string `json:"-" gorm:"primary_key"`
Date_consultation string
Fk_maladie_id uint `json:"-"`
Fk_compte_medecin_id uint `gorm:"primary_key"`
Maladie Maladie `gorm:"ForeignKey:ID;AssociationForeignKey:Fk_maladie_id"`
Medicament []Medicament `gorm:"many2many:tt_traitement"`
}
type Medicament struct {
ID int `gorm:"primary_key"`
Nom string `gorm:"column:medicament_nom"`
Description string `gorm:"column:medicament_desc"`
}
func GetPatientWithDiseases(id uint) (*Patient, error) {
patient := &Patient{}
err := GetDB().Preload("Historique.Maladie").Preload("Historique.Medicament").Find(&patient, id).Error
if err != nil {
return nil, err
}
return patient, nil
}
And things worked ! I just had to rename some of my columns, but as it is a dummy database, it wasn't an issue :) !
I hope this can help someone out there !