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我有一个朋友列表,应该在一页中显示 3 个。每个朋友都有一个类别,我还有一个下拉菜单可以选择仅查看来自所选类别的朋友。它们也应该在一页中显示 3 个。过滤和未过滤朋友的显示方式是相同的,所以我不想在我的控制器和两个相同的模板中有两个几乎动作,所以我尝试在一个控制器的动作和模板中进行此操作,但是有一个问题。我无法为过滤后的朋友的第二页和后续页进行分页。请帮忙!:(问题是我使用了一个表单,当我点击第二页时,填写在表单中并绑定的变量变得未定义。这是代码:

  1. 控制器的动作

    public function displayAction($page, Request $request)
    {
        $em = $this->getDoctrine()->getEntityManager();
        $user = $this->get('security.context')->getToken()->getUser();
    
        $cat = new Category();
    
        $dd_form = $this->createForm(new ChooseCatType($user->getId()), $cat);
    
        if($request->get('_route')=='filter')
        {
            if($request->getMethod() == 'POST')
            {
    
                $dd_form->bindRequest($request);
    
                if($cat->getName() == null)
                {      
                    return $this->redirect($this->generateUrl('home_display'));
                }
    
                $filter = $cat->getName()->getId();
                if ($dd_form->isValid())
                {   
                    $all_friends = $em->getRepository('EMMyFriendsBundle:Friend')
                                      ->filterFriends($filter);
                    $result = count($all_friends);
                    $FR_PER_PAGE = 3;
                    $pages = $result/$FR_PER_PAGE;
                    $friends = $em->getRepository('EMMyFriendsBundle:Friend')
                                  ->getFilteredFriendsFromTo($filter, $FR_PER_PAGE, ($page-1)*$FR_PER_PAGE); 
    
                    $link = 'filter';
                }
            }
        }
    
        else
        {
            $all_friends = $user->getFriends();
    
            $result = count($all_friends);
            $FR_PER_PAGE = 3;
            $pages = $result/$FR_PER_PAGE;
    
            $friends = $em->getRepository('EMMyFriendsBundle:Friend')
                          ->getFriendsFromTo($user->getId(), $FR_PER_PAGE, ($page-1)*$FR_PER_PAGE); 
    
            $link = 'home_display';
        }
    
        // Birthdays
        $birthdays = null;
        $now = new \DateTime();
        $now_day = $now->format('d');
        $now_month = $now->format('m');
    
        foreach ($all_friends as $fr)
        {
            if($fr->getBirthday() != null)
            {    
                if($fr->getBirthday()->format('d') == $now_day && $fr->getBirthday()->format('m') == $now_month)
                {
                    $birthdays[]=$fr;
                    $fr->setYears();
                }
            }
        }
    
        // Search
        $search = new Search();
        $s_form = $this->createFormBuilder($search)
            ->add('words', 'text', array(
            'label' => 'Search: ',
            'error_bubbling' => true))
            ->getForm();
    
    
        // Renders the template
        return $this->render('EMMyFriendsBundle:Home:home.html.twig', array(
            'name' => $name, 'friends' => $friends, 'user' => $user, 'birthdays' => $birthdays, 'pages' => $pages, 'page' => $page, 'link' => $link,
            'dd_form' => $dd_form->createView(), 's_form' => $s_form->createView()));
    }
    
  2. 模板

    {% if birthdays != null %}
            <div>
    
                <img class="birthday" src="http://www.clker.com/cliparts/1/d/a/6/11970917161615154558carlitos_Balloons.svg.med.png">
    
                <div class="try"> 
                    This friends have birthday today: 
                    {% for bd in birthdays %}
    
                        <p>
                            <a href="{{ path('friend_id', {'id': bd.id}) }}">{{ bd.name }}</a>
                            <span class="years">
                                ({{ bd.years }} years)
                            </span>
                        </p>
    
                    {% endfor %}
                </div>
    
            </div>
        {% endif %}
    
        {% for fr in friends %}
    
            {# TODO: Fix where are shown #}
    
            {% if fr.getWebPath()!=null %}
                <a href="{{ path('friend_id', {'id': fr.id}) }}">
                    <img class="avatar" src="{{ fr.getWebPath }}">
                </a>
            {% endif %}
    
            {% if loop.index is odd %}
                    <p class="list1">
                {% else %}
                    <p class="list2">
            {% endif %}
                        <a class="friends" href="{{ path('friend_id', {'id': fr.id}) }}">{{ fr.name }}</a>
                    </p>
    
        {% endfor %}
    
        {# TODO: Pagination #}
        {% if pages>1 %}
        <p>
        {% for i in 0..pages %}
    
                {% if page == loop.index %}
                <span class="pagination">{{ loop.index }}</span>
    
                {% else %}
                <span class="pagination"><a  href="{{ path(link, {'page': loop.index}) }}">{{ loop.index }}</a></span>
                {% endif %}
    
        {% endfor %}
        </P>
        {% endif %}
    
        <p>Choose category:</p>   
        <form class="search" action="{{ path('filter') }}" method="post" {{ form_enctype(s_form) }}> 
            {{ form_widget(dd_form.name) }}
            {{ form_rest(dd_form) }}
            <input type="submit" value="Show friends" />
        </form>
    
  3. 存储库

    类 FriendRepository 扩展了 EntityRepository
    {
        公共函数 getFriendsFromTo ($user, $limit, $offset)
        {
             返回 $this->getEntityManager()
                ->createQuery('SELECT f FROM EMMyFriendsBundle:Friend f WHERE f.user='.$user.'ORDER BY f.name ASC')
                ->setMaxResults($limit)
                ->setFirstResult($offset)
                ->getResult();
        }
    公共函数 filterFriends ($filter)
        {
            $q = $this->createQueryBuilder('f');

        $q->select('f')
          ->where('f.category = :filter')            
          ->setParameter('filter', $filter);
    
        return $q->getQuery()->getResult();
    }
    
    public function getFilteredFriendsFromTo ($filter, $limit, $offset)
    {
        $q = $this->createQueryBuilder('f');
    
        $q->select('f')
          ->where('f.category = :filter')
                ->setMaxResults($limit)
            ->setFirstResult($offset)
          ->setParameter('filter', $filter);
    
        return $q->getQuery()->getResult();
    }
    }
    

我尝试了很多东西,但总是有问题。在这段代码中,它说$all_friends生日 for 循环中的变量没有定义——是的,它没有定义。也许我必须将它存储在会话中,我尝试了这个:

    $session = $this->getRequest()->getSession();

    $session->set('all_friends');

然后传递$friends=$session->get('all_friends');给for循环,但它不起作用,并且变量不是$all_friends太大而无法存储它吗?

任何想法将不胜感激!感谢您的时间和精力!


编辑

当我使用会话的方式和

    $session = $this->getRequest()->getSession();

    $session->set('all_friends');

    $fri=$session->get('all_friends');

    foreach ($fri as $fr)
    { .... }

我得到的错误是

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\MyFriends\src\EM\MyFriendsBundle\Controller\HomeController.php line 100

并且

Warning: Missing argument 2 for Symfony\Component\HttpFoundation\Session::set(), called in C:\xampp\htdocs\MyFriends\src\EM\MyFriendsBundle\Controller\HomeController.php on line 71 and defined in C:\xampp\htdocs\MyFriends\app\cache\dev\classes.php line 148

当我不使用会话时,我得到

Notice: Undefined variable: all_friends in C:\xampp\htdocs\MyFriends\src\EM\MyFriendsBundle\Controller\HomeController.php line 100

当我选择一个类别来显示其中的朋友时,我单击它的第二页。

PS 错误中的行与我粘贴的代码中的行不对应,因为我跳过了操作、存储库和模板的某些部分,因为它们与此问题无关并且它们工作正常。如果有人愿意,我可以发送给他或在此处更新所有代码。

4

1 回答 1

1

您没有在 session 上设置任何内容:

$session->set('all_friends');

你应该这样做:

$session->set('all_friends', $data);

你也应该真正开始尊重 Symfony2 编码标准。

当我尝试阅读您的代码时,我的眼睛正在融化。你应该阅读这个并且不要忘记创建表单类而不是在你的控制器中创建表单。

编辑:如果您的 $data 是 Doctrine2 查询的结果,我建议您只存储entity identity class以便稍后在需要时获取它们。

EDIT2:这里有一些代码可以帮助您保存会话过滤器数据。PS,别忘了补充缺失的use ....

/**
 * Set filters
 *
 * @param array  $filters Filters
 * @param string $type    Type
 */
public function setFilters($name, array $filters = array())
{
    foreach ($filters as $key => $value) {
        // Transform entities objects into a pair of class/id
        if (is_object($value)) {
            if ($value instanceof ArrayCollection) {
                if (count($value)) {
                    $filters[$key] = array(
                        'class' => get_class($value->first()),
                        'ids' => array()
                    );
                    foreach ($value as $v) {
                        $identifier = $this->getDoctrine()->getManager()->getUnitOfWork()->getEntityIdentifier($v);
                        $filters[$key]['ids'][] = $identifier['id'];
                    }
                } else {
                    unset($filters[$key]);
                }
            } elseif (!$value instanceof \DateTime) {
                $filters[$key] = array(
                    'class' => get_class($value),
                    'id'    => $this->getDoctrine()->getManager()->getUnitOfWork()->getEntityIdentifier($value)
                );
            }
        }
    }

    $this->getRequest()->getSession()->set(
        $name,
        $filters
    );
}

/**
 * Get Filters
 *
 * @param array $filters Filters
 * @param type  $type    Type
 *
 * @return array
 */
public function getFilters($name, array $filters = array())
{
    $filters = array_merge(
        $this->getRequest()->getSession()->get(
            $name,
            array()
        ),
        $filters
    );

    foreach ($filters as $key => $value) {
        // Get entities from pair of class/id
        if (is_array($value) && isset($value['class'])) {
            if (isset($value['id'])) {
                $filters[$key] = $this->getDoctrine()->getManager()->find($value['class'], $value['id']);
            } elseif (isset($value['ids'])) {
                $data = $this->getDoctrine()->getManager()->getRepository($value['class'])->findBy(array('id' => $value['ids']));
                $filters[$key] = new ArrayCollection($data);
            }
        }
    }

    return $filters;
}

EDIT3:为什么你不使用KnpPaginatorBundle进行分页?

于 2013-05-03T14:09:55.833 回答