ModelAdmin with a has_many relationship - php

Question

I'm extending ModelAdmin to manage a DataObject and I have a $has_many relationship that is managed by another DataObject. I'd like to manage this object on another tab but am lost as to how I'd add it. My basic code:
ApplicationAdmin.php:
class Applications extends ModelAdmin {
private static $menu_title = 'Applications';
private static $url_segment = 'apps';
private static $managed_models = array (
'Application'
);
}
Application.php
class Application extends DataObject {
private static $db = array(
'Name' => "varchar"
);
private static $has_many = array(
'Documents' => 'Document',
);
public function getCMSFields() {
$fields = FieldList::create(
TextField::create('Name'),
);
return $fields;
}
}
Document.php
class Document extends DataObject {
private static $db = array(
'Title' => "varchar",
);
private static $has_one = array(
"Document" => "File",
"Application" => "Application"
);
public function getCMSFields () {
$fields = FieldList::create(
TextField::create('Title'),
$doc = new UploadField('Document')
);
$doc->getValidator()->setAllowedExtensions(array('pdf', 'docx'));
return $fields;
}
}
Basically I'd like to manage the documents for this entry under Root.Documents tab.

Answer 1

You can use a GridField to handle the relation between Application and Document, and place that field on its own tab if you wish. Example:
# Application.php
public function getCMSFields() {
$fields = parent::getCMSFields();
$nameField = TextField::create('Name');
$documentsField = GridField::create(
'Documents',
'Documents',
$this->Documents(),
GridFieldConfig_RelationEditor::create()
);
$fields->addFieldToTab(
'Root.Main',
$nameField
);
$fields->addFieldToTab(
'Root.Documents',
$documentsField
);
return $fields;
}
Your code contains a some typos in the Document class (the classname has .php in it, getValidator should be getValidator()), and that class also needs a $has_one = ['Application' => 'Application']; for the relation to work.