DB.Create(&user)

	var user2 User
	var err error
	err = DB.InnerJoins("Company").InnerJoins("Manager").InnerJoins("Account").First(&user2, "users.name = ?", user.Name).Error
	AssertEqual(t, err, nil)
	CheckUser(t, user2, user)

	// inner join and NamedPet is nil
	err = DB.InnerJoins("NamedPet").InnerJoins("Company").InnerJoins("Manager").InnerJoins("Account").First(&user2, "users.name = ?", user.Name).Error

func (db *DB) Joins(query string, args ...interface{}) (tx *DB) {
	return joins(db, clause.LeftJoin, query, args...)
}

// InnerJoins specify inner joins conditions
// db.InnerJoins("Account").Find(&user)
func (db *DB) InnerJoins(query string, args ...interface{}) (tx *DB) {
	return joins(db, clause.InnerJoin, query, args...)
}