Silverstripe 通过控制器返回填充表单

Question

我正在尝试找出返回预先填充数据库数据的表单的正确方法。让我告诉你我现在是怎么做的：

团队页面：

<?php
class TeamsPage extends Page {
  private static $has_many = array (
    'Teams' => 'Team',
  );
  public function getCMSFields() {
    $fields = parent::getCMSFields();
    $fields->addFieldToTab('Root.Teams', GridField::create(
        'Teams',
        'Teams on this page',
        $this->Teams(),
        GridFieldConfig_RecordEditor::create()
    ));
    return $fields;
  }
}
class TeamsPage_Controller extends Page_Controller {
  private static $allowed_actions = array (
    'show', 'edit', 'EditTeamForm'
  );

  public function EditTeamForm($teamId){
    $fields = new FieldList(
        new TextField('TeamName'),
        new TextareaField('TeamDescription')
    );
    $actions = new FieldList(
        new FormAction('EditTeam', 'Save Changes')
    );
    $requiredFields = new RequiredFields(array('TeamName','TeamDescription'));
    $form = new Form($this, 'EditTeamForm', $fields, $actions, $requiredFields);
    $form->setFormMethod('POST', true);

    $data = Session::get("FormData.{$form->getName()}.data");
    $team = Team::get()->byID($teamId);
    return $data ? $form->loadDataFrom($data) : $form->loadDataFrom($team);
  }

  public function show(SS_HTTPRequest $request) {
    $team = Team::get()->byID($request->param('ID'));

    if(!$team) {
        return $this->httpError(404,'That team could not be found');
    }

    return array (
        'Team' => $team
    );
  }

  public function edit(SS_HTTPRequest $request){
    $team = Team::get()->byID($request->param('ID'));

    if(!$team) {
        return $this->httpError(404,'That team could not be found');
    }

    return array (
        'Team' => $team
    );
  }
}

团队：

<?php
class Team extends DataObject {
  private static $db = array(
    'TeamCaptain' => 'Int',
    'TeamName' => 'Varchar',
    'TeamDescription' => 'Text'
  );
  private static $has_one = array (
    'Photo' => 'Image',
    'TeamsPage' => 'TeamsPage'
  );
  private static $summary_fields = array (
    'GridThumbnail' => '',
    'TeamCaptain' => 'Team Captain',
    'TeamName' => 'TeamName',
    'TeamDescription' => 'Team Description',
  );
  public function getGridThumbnail() {
    if($this->Photo()->exists()) {
        return $this->Photo()->SetWidth(100);
    }
    return '(no image)';
  }
  public function getCMSFields() {
    $fields = FieldList::create(
        TextField::create('TeamCaptain'),
        TextField::create('TeamName'),
        TextareaField::create('TeamDescription'),
        $uploader = UploadField::create('Photo')
    );
    $uploader->setFolderName('teams-photos');
    $uploader->getValidator()->setAllowedExtensions(array(
        'png','gif','jpeg','jpg'
    ));
    return $fields;
  }

  public function Link() {
    return $this->TeamsPage()->Link('show/'.$this->ID);
  }
}

TeamsPage_edit.ss

<% if GetMember() %>
  Welcome $getMember.FirstName<br />
  $EditTeamForm($Team.ID)
  <a href="home">Back to Home</a>
<% else %>
  $GoToLogin()
<% end_if %>

正如您在我的控制器中看到的，我返回了一个我不完全理解它是如何工作的 $Team。在我的模板中，我使用 $Team.ID 并试图确定该值是否来自我返回的团队数组或其他方式。我试图理解的另一件事是为什么我不在这里返回表单，为什么我必须有一个单独的函数来创建该表单并且必须在模板中调用它。我在这里看到的最后一个问题是我要查询数据库两次以获取相同的信息。

我最后要问的是，如果有人能告诉我什么是实现我正在做的事情的正确方法。我确信它已经做过很多次了，但是我在互联网上的任何地方都找不到一个关于如何使用编辑表单的例子。我已经找到了如何使用显示操作并返回一堆结果，但没有与表单结合使用。

Answer 1

我建议简单地执行以下操作（这些是对代码的补充，不是完整的类）：

class TeamPage_Controller extends Page_Controller {
    protected $currentTeam;

    protected function getCurrentTeam() {
        if (!isset($this->currentTeam)) {
            $teamID = $this->getRequest()->param('ID') ?: $this->getRequest()->postVar('ID');
            $this->currentTeam = $teamID ? Team::get()->byID($teamID) : null;
        }
        return $this->currentTeam;
    }

    public function EditTeamForm() {
         $team = $this->getCurrentTeam();             
         // You'll want to add a HiddenField with the ID if $team is not null
         // everything else is the same
    }

    // NOTE: I would suggest you call this something else
    // SS convention would be "doSaveTeam" - it should be whatever your FormAction is called though
    public function EditTeam($data, $form) {
        $team = $this->getCurrentTeam();
        // Save and redirect
    }

    public function edit(SS_HTTPRequest $request){
        $team = $this->getCurrentTeam();
        // Blah blah blah
    }
}