/
GormUUIDIDBeforeCreateCallback.go
53 lines (49 loc) · 1.48 KB
/
GormUUIDIDBeforeCreateCallback.go
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package gormgenericrepo
import (
"context"
"github.com/google/uuid"
"gorm.io/gorm"
"gorm.io/gorm/schema"
"reflect"
)
func reflectSetUUIDForSchemeField(fieldScheme *schema.Field, ctx context.Context, value reflect.Value) {
idAlreadySet := false
if fieldValue, isZero := fieldScheme.ValueOf(ctx, value); !isZero {
if id, ok := fieldValue.(uuid.UUID); ok {
if id != uuid.Nil {
idAlreadySet = true
}
}
}
if !idAlreadySet {
err := fieldScheme.Set(ctx, value, uuid.New())
if err != nil {
panic(err)
}
}
}
// beforeCreate hook with uuid.UUID id set
func beforeCreate(db *gorm.DB) {
if db.Statement.Schema != nil && db.Statement.Schema.PrioritizedPrimaryField != nil {
idField := db.Statement.Schema.PrioritizedPrimaryField
switch idField.FieldType {
case reflect.TypeOf(uuid.UUID{}):
switch db.Statement.ReflectValue.Kind() {
case reflect.Slice, reflect.Array:
for i := 0; i < db.Statement.ReflectValue.Len(); i++ {
refVal := db.Statement.ReflectValue.Index(i)
reflectSetUUIDForSchemeField(idField, db.Statement.Context, refVal)
}
default:
reflectSetUUIDForSchemeField(idField, db.Statement.Context, db.Statement.ReflectValue)
}
}
}
}
// AddGormBeforeCreateUUIDIDSetCallback sets before "gorm:before_create" callback that sets uuid ids for entities
func AddGormBeforeCreateUUIDIDSetCallback(db *gorm.DB) {
err := db.Callback().Create().Before("gorm:before_create").Replace("uuid:before_create", beforeCreate)
if err != nil {
panic(err)
}
}