cakephp formhelper：在编辑时从输入文件获取当前文件

Question

我有一个可以提交图片的表单，这不是我最初的代码，我正在继承它，我正在努力解决它并解决问题。

编辑此表单中的数据时，输入文件与其他输入文件不同，为空。所以保存实际上将当前文件替换为数据库中的"array"。

我希望能够保留当前的，如果它没有改变？

表单编辑：

<h1>Edit</h1>
<?php
echo $this->Form->create($template,['enctype' => 'multipart/form-data']);
echo $this->Form->input('title');
echo $this->Form->input('works_id');                 
echo $this->Form->input('photo',['type' => 'file']);
echo $this->Form->input('text', ['rows' => '4']);
echo $this->Form->input('url');
echo $this->Form->button(__('Save'));
echo $this->Form->end();
?>

从控制器编辑功能：

public function edit($id = null){
    $template = $this->Templates->get($id);
    if ($this->request->is(['post', 'put'])) {
        $template = $this->Templates->patchEntity($template, $this->request->data,['associated' => ['Works']]);
        if ($this->Templates->save($template)) {
            $this->Flash->success(__('Your template has been updated.'));
            return $this->redirect(['action' => 'index']);
        }
        $this->Flash->error(__('Unable to update your template.'));
    }
    $this->set('template', $template);

    $works = $this->Templates->Works->find('list');
    $this->set(compact('works'));
}

在我的数据库中，它保存在两个列中： file_dir 和文件名，所以我更困惑如何在编辑表单中获取文件。

编辑：添加模板表：

<?php
namespace App\Model\Table;

use Cake\ORM\Table;
use Cake\Validation\Validator;

class TemplatesTable extends Table
{
protected function _initializeSchema(\Cake\Database\Schema\Table $table){
    $table->columnType('photo', 'proffer.file');
    return $table;
}
public function initialize(array $config){
    $this->addBehavior('Timestamp');
    $this->addBehavior('Proffer.Proffer', [
        'photo' => [
            'root' => WWW_ROOT.'files',
            'dir' => 'photo_dir',
            'thumbnailSizes' => [
                'square' => ['w' => 200, 'h' => 200],
                'portrait' => ['w' => 100, 'h' => 300, 'crop' => true],
            ],
            'thumbnailMethod' => 'gd' // Options are Imagick, Gd or Gmagick
        ]
    ]);
    $this->belongsTo(
        'Works',
        [
            'foreignKey' => 'work_id',
        ]
    );
}
public function validationDefault(Validator $validator){
    $validator
        ->notEmpty('work_id')
        ->notEmpty('title');
    return $validator;
}
}

Answer 1

根据文档，Proffer 行为可以开箱即用地处理空上传，您只需相应地配置该字段的验证规则以允许它在更新时为空：

If you want your users to submit a file when creating a record, but not when updating it, you can configure this using the basic Cake rules.
$validator
    ->requirePresence('image', 'create')
    ->allowEmpty('image', 'update');
So now your users do not need to upload a file every time they update a record.

所以在你的情况下是：

->requirePresence('photo', 'create')
->allowEmpty('photo', 'update')

cakephp formhelper：在编辑时从输入文件获取当前文件

cakephp formhelper : getting current file from input file on edit

forms

cakephp

file-upload

edit

cakephp-3.x