Silverstripe: get var from many_many relation custom upload

问题

I would like to know how customize this uploadfield to get from $belongs_many_many Act table.

A part of the code....

<? 

class MultipleBlock extends DataObject {

    private static $db = array(
        'Act' => 'Varchar',


    private static $many_many = array(
        'MultipleBlockColumns' => 'MultipleBlockColumn'
    );


}

class MultipleBlockColumn extends DataObject {

    static $belongs_many_many = array(
        'MultipleBlocks' => 'MultipleBlock'
    );
    private static $has_one = array(
        'Image' => 'Image',
    );

    $fields->addFieldToTab('Root.Image',$uploadField = new UploadField(
                $name = 'Image',
                $title = 'Image'
            )    
        );

    enter code here
    $uploadField->setFolderName('Uploads/Subsite'.Subsite::currentSubsiteID().'/images/'.$var);

}

I have tried these methods to get Act variable but nothing appear:

$var=$this->Parent->MultipleBlocks->Act;
$var=$this->many_many(MultipleBlocks)->Act;
$var=$this->Parent->Act;

Any idea? Thanks in advance!

回答1:

If I'm reading your code correctly, the reason why you aren't able to access the Act variable is due to the fact that you're not iterating through the MultipleBlocks relation. A sample of how to get the Act variable for a the related MultipleBlocks would be as follows (within your template/layout file):

<% loop $MultipleBlocks %>
$Act
<% end_loop %>

In php it would be something along the lines of:

$multipleBlocks = $this->MultipleBlocks();
foreach($multipleBlocks as $block){
    $act = $block->Act;
}

When you reference MultipleBlocks as you did in the $this->MultipleBlocks->Act it won't work as MultipleBlocks is a many relation so it's actually a DataList rather than an individual object.

Update

Here is the has_many/has_one example:

class MultipleBlock extends DataObject {

    private static $db = array(
        'Act' => 'Varchar',
    );


    private static $has_many = array(
        'MultipleBlockColumns' => 'MultipleBlockColumn'
    );


}

class MultipleBlockColumn extends DataObject {

    private static $has_one = array(
        'MultipleBlock' => 'MultipleBlock'
    );
    private static $has_one = array(
        'Image' => 'Image',
    );

    public function getBlockAct(){
        return $this->MultipleBlock()->Act;
    }

}

回答2:

Wow... after some days, and learning Silverstripe little more, I have found my solution. To achieve MultiBlocks from MultiBlock column is this :

parent::MultipleBlocks();

To make my save to folder customization, there is my code... It works perfectly well. The ID of the MultiBlockColumns must be create first.

$parent = parent::MultipleBlocks();
            $uploadField->setFolderName('Uploads/Subsite'.Subsite::currentSubsiteID().'/images/'.$parent['MultipleBlock']->Act);

That's it! Thanks for submitting idea.

来源：https://stackoverflow.com/questions/29475944/silverstripe-get-var-from-many-many-relation-custom-upload

标签

silverstripe

relation