<body>
例如：我想添加一篇博客，里面有一个分类，我应该有一个category_id字段，然后在添加博客的时候可以通过下拉列表选择。
疑问：
我的下拉列表中怎么才能有我添加好的分类列表呢！
posts和category的关系
<code>#Demo\TestBundle\Entity\PostsDemo\TestBundle\Entity\Posts:type: entitytable: postsrepositoryClass: Demo\TestBundle\Repository\PostsRepositoryid: id: type: integer id: true genertor: { strategy: AUTO }fields: title: type: string length: 64 author: type: string length: 32 create_at: type: integer update_at: type: integermanyToOne: category: targetEntity: Category inversedBy: postsDemo\TestBundle\Entity\Category:type: entitytable: categoryrepositoryClass: Demo\TestBundle\Repository\CategoryRepositoryid: id: type: integer id: true genertor: strategy: AUTOfields: title: type: string length: 16 create_at: type: integer update_at: type: integeroneToMany: posts: targetEntity: Posts mappedBy: category</code>
form表单时通过命令生成的:php app/console doctrine:generate:form DemoTestBundle:Posts
<code><?phpnamespace Demo\TestBundle\Form;use Symfony\Component\Form\AbstractType;use Symfony\Component\Form\FormBuilderInterface;use Symfony\Component\OptionsResolver\OptionsResolverInterface;class PostsType extends AbstractType{ /** * @param FormBuilderInterface $builder * @param array $options */public function buildForm(FormBuilderInterface $builder, array $options){ $builder ->add('id') ->add('title') ->add('author') ->add('create_at') ->add('update_at') ->add('category') ;}/** * @param OptionsResolverInterface $resolver */public function setDefaultOptions(OptionsResolverInterface $resolver){ $resolver->setDefaults(array( 'data_class' => 'Demo\TestBundle\Entity\Posts' ));}/** * 表单标示符， name属性 * @return string */public function getName(){ return 'posts';}</code>
}
大概就是这样子，不知道哪里要调还是代码错误了，希望跟路大侠指教。
回复内容：
<body>
例如：我想添加一篇博客，里面有一个分类，我应该有一个category_id字段，然后在添加博客的时候可以通过下拉列表选择。
疑问：
我的下拉列表中怎么才能有我添加好的分类列表呢！
posts和category的关系
<code>#Demo\TestBundle\Entity\PostsDemo\TestBundle\Entity\Posts:type: entitytable: postsrepositoryClass: Demo\TestBundle\Repository\PostsRepositoryid: id: type: integer id: true genertor: { strategy: AUTO }fields: title: type: string length: 64 author: type: string length: 32 create_at: type: integer update_at: type: integermanyToOne: category: targetEntity: Category inversedBy: postsDemo\TestBundle\Entity\Category:type: entitytable: categoryrepositoryClass: Demo\TestBundle\Repository\CategoryRepositoryid: id: type: integer id: true genertor: strategy: AUTOfields: title: type: string length: 16 create_at: type: integer update_at: type: integeroneToMany: posts: targetEntity: Posts mappedBy: category</code>
form表单时通过命令生成的:php app/console doctrine:generate:form DemoTestBundle:Posts
<code><?phpnamespace Demo\TestBundle\Form;use Symfony\Component\Form\AbstractType;use Symfony\Component\Form\FormBuilderInterface;use Symfony\Component\OptionsResolver\OptionsResolverInterface;class PostsType extends AbstractType{ /** * @param FormBuilderInterface $builder * @param array $options */public function buildForm(FormBuilderInterface $builder, array $options){ $builder ->add('id') ->add('title') ->add('author') ->add('create_at') ->add('update_at') ->add('category') ;}/** * @param OptionsResolverInterface $resolver */public function setDefaultOptions(OptionsResolverInterface $resolver){ $resolver->setDefaults(array( 'data_class' => 'Demo\TestBundle\Entity\Posts' ));}/** * 表单标示符， name属性 * @return string */public function getName(){ return 'posts';}</code>
}
大概就是这样子，不知道哪里要调还是代码错误了，希望跟路大侠指教。
如果要用到 doctrine relationship 就用 ->add(‘product’, ‘entity’ , array(…))
如果不要 doctrine relationship 就在
<code class="lang-php">class PostsType extends AbstractType { private $choices; public function __construct( $choices) { $this->choices = $choices; } public function buildForm(FormBuilderInterface $builder, array $options) { .... $builder->add('category' , 'choices' , array( 'choices' => $this->choices , ) ); }}</code>
<code class="lang-php">在你要实例化表单的时候public function xxxAction(){ $this->createForm( new PostsType( $this->getChoices() ) );}</code>
<code class="lang-php">同样在Action中加入private function getChoices(){ //从Entitiy获取choices选项或者自己定义 return array(1 => '...' , 2 =>'....' );}</code>
把这个
->add(‘category’)
改成
->add(‘category’, ‘choice’)
试一下看看
->add(‘category’, null, array(‘property’ => ‘title’));
->add(‘product’, ‘entity’, array( ‘class’ => ‘Demo\TestBundle\Entity\Category’, ‘property’ => ‘title’ ))
看出错提示是说Category实体内没有实现__toString
4本文￥来源gao!%daima.com搞$代*!码$网9
搞代gaodaima码
()这个方法。所以解决之道就是到Category实体里面去实现这个方法。你可以在__toString()这个方法里面返回要显示在下拉列表中的东西。比如用titile：
<code class="lang-php">// file: Demo/TestBundle/Entity/Category.phppublic funciton __toString() { return $this->getTitle();}</code>
转载请注明原文链接：symfony2 表单和entity疑问
