symfony2學說從現有數據庫映射雙向鏈接

我在一個Symfony2的框架newbe和我面臨的一個問題：

如何從現有的數據庫雙向關係？

起初，我爲我的項目創建了數據庫，並將其映射到yml文件; 簡單，DB是這樣的：

表user：

CREATE TABLE user (
    `id` INT NOT NULL AUTO_INCREMENT , 
    `login` VARCHAR(255) NULL , 
    `password` VARCHAR(255) NULL , 
    `customer_id` INT NOT NULL ,  
    PRIMARY KEY (`id`) , 
    INDEX `fk_user_customer1_idx` (`customer_id` ASC) , 
    CONSTRAINT `fk_user_customer1` 
     FOREIGN KEY (`customer_id`) 
     REFERENCES `customer` (`id`) 
) ENGINE = InnoDB

表customer：

CREATE TABLE IF NOT EXISTS `customer` (
    `id` INT NOT NULL AUTO_INCREMENT , 
    `surname` VARCHAR(45) NULL , 
    `name` VARCHAR(45) NULL , 
    `midname` VARCHAR(45) NULL , 
    PRIMARY KEY (`id`) 
) ENGINE = InnoDB

如果我是正確的，「用戶」有許多-to-one的關係「顧客」;而「用戶」是一方，「顧客」是一個反面;

然後我運行這些命令：

php app/console doctrine:mapping:import ShadowTestBundle yml --force

，並得到了結果：

Shadow\TestBundle\Entity\User: 
    type: entity 
    table: user 
    fields: 
     id: 
      id: true 
      type: integer 
      unsigned: false 
      nullable: false 
      generator: 
       strategy: IDENTITY 
     login: 
      type: string 
      length: 255 
      fixed: false 
      nullable: true 
     password: 
      type: string 
      length: 255 
      fixed: false 
      nullable: true 
    manyToOne: 
     customer: 
      targetEntity: Customer 
      cascade: { } 
      mappedBy: null 
      inversedBy: null 
      joinColumns: 
       customer_id: 
        referencedColumnName: id 
      orphanRemoval: false 
    lifecycleCallbacks: { } 


Shadow\TestBundle\Entity\Customer: 
    type: entity 
    table: customer 
    fields: 
     id: 
      id: true 
      type: integer 
      unsigned: false 
      nullable: false 
      generator: 
       strategy: IDENTITY 
     surname: 
      type: string 
      length: 45 
      fixed: false 
      nullable: true 
     name: 
      type: string 
      length: 45 
      fixed: false 
      nullable: true 
     midname: 
      type: string 
      length: 45 
      fixed: false 
      nullable: true 
    lifecycleCallbacks: { }

，符合通過運行命令實體：

php app/console doctrine:generate:entities ShadowTestBundle

實體反映正確的YML-文件;

但是，yml文件和實體都只使用單向鏈接;是否可以生成雙向鏈接，或者我必須手動編寫它？據我看到的，它應該是一個：

Shadow\TestBundle\Entity\Customer: 
    type: entity 
    table: customer 
    fields: 
... 
     midname: 
      type: string 
      length: 45 
      fixed: false 
      nullable: true 
     oneToMany: 
      user: 
       targetEntity: User 
       mappedBy: cart 
lifecycleCallbacks: { }

而且我也有一點subquestion：爲什麼在擁有方（用戶），它通過主義產生的，現場「inversedBy」爲空？

來源

2013-11-20 user3012819