Can't get GORM associations to work as expected - go

Question

My two models are
package models
// Business ...
type Business struct {
ID uint
Name string `gorm:"not null"`
Tables Tables `gorm:"ForeignKey:BusinessID"`
}
// Businesses ...
type Businesses []Business
and
package models
// Table ...
type Table struct {
ID uint
Ref string `gorm:"not null"`
Business Business
BusinessID uint
}
// Tables ...
type Tables []Table
It may be obvious from the code, but the association should be that one 'business' has many 'tables' and a 'table' belong to a 'business'. However, when the database is created there are no foreign keys created (I am using sqlite3) and when I return the business which has been created with
bus := models.Business{
Name: "Test",
Tables: models.Tables{
models.Table{Ref: "A1"},
},
}
db.Create(&bus)
the businesses array is empty, and when the table is returned although the business_id is correct, there is business struct is empty also.

Answer 1

I could not reproduce your problem. I have a working solution here. I suspected that it would not work with the entities in a separate models package, but that worked as well.
package main
import (
"log"
"github.com/jinzhu/gorm"
_ "github.com/jinzhu/gorm/dialects/sqlite"
_ "github.com/mattn/go-sqlite3"
)
type Business struct {
ID uint
Name string `gorm:"not null"`
Tables Tables `gorm:"ForeignKey:BusinessID"`
}
type Table struct {
ID uint
Ref string `gorm:"not null"`
Business Business
BusinessID uint
}
type Tables []Table
type Businesses []Business
func main() {
var err error
var db *gorm.DB
db, err = gorm.Open("sqlite3", "test.db")
if err != nil {
log.Fatal(err)
}
defer db.Close()
db.LogMode(true)
db.AutoMigrate(&Business{})
db.AutoMigrate(&Table{})
bus := Business{
Name: "Test",
Tables: Tables{
Table{Ref: "A1"},
},
}
db.Create(&bus)
var businesses Businesses
db.Preload("Tables").Find(&businesses)
log.Println(businesses)
}