SilverStripe 3.1 ListboxField save array to database

问题

I want to know how to correctly save values selected with a ListboxField.

new ListboxField(
    $name = "Categorie",
    $title = "Catégorie(s)",
    Categories::get()->map('ID','Title'),
    $value = 1,
    $size = 4,
    $multiple = true
);

In my example, I can save more than one category to a $db field. I am using:

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

It works, but when I'm trying to get back categories names into a template it dosen't work at all. The data stored for example is "1,4,9".

Is there a better way to store variables from ListboxField?

回答1:

3dgoo is correct that you're probably best using a has_many or many_many relationship here. If for some reason you need to use a single text field, you would just need to manually add a method to your model to look up those related records:

public function getCategories() {
    if (empty($this->Categorie)) return null;
    return Categories::get()->filter('ID', explode(',', $this->Categorie));
}

You can then do something like the following in your template:

<% loop $Categories %><li>$Title</li><% end_loop %>

回答2:

Use a $many_many relationship instead of a $db variable to manage your relationship between your object and Categories.

private static $many_many = array(
    'Categories' => 'Categories'
);

public function getCMSFields() {

    $fields = parent::getCMSFields();

    $fields->addFieldToTab('Root.Main', ListboxField::create(
        'Categories',
        'Catégories',
        Categories::get()->map('ID', 'Title')->toArray(),
        1,
        4,
        true
    ));

    return $fields;
}

来源：https://stackoverflow.com/questions/33130258/silverstripe-3-1-listboxfield-save-array-to-database

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