func compositeIndex(table *gorm.DB, kind string, primary_key string, dst interface{}, parents []string) {
index_name := "idx_" + kind + "_" + primary_key
indexes := []string{primary_key}
if len(parents) == 0 {
parents = []string{}
st := reflect.TypeOf(dst).Elem()
for i := 0; i < st.NumField(); i++ {
field := st.Field(i)
pacific_parent := field.Tag.Get("pacific_parent")
if pacific_parent != "" {
parents = append(parents, pacific_parent)
}
}
}
for _, parent := range parents {
if parent != "" {
index_name = index_name + "_" + parent
indexes = append(indexes, parent)
}
}
if len(indexes) > 0 {
table.AddUniqueIndex(index_name, indexes...) //TODO: if not exists?
}
}