This is strange. I may be doing something wrong. I created an Article DataObject that I am managing under a Category page with a DOM. I wanted to allow the users to manage the articles via ModelAdmin too. When I try do a search in ModelAdmin, no search results appear (even if I don't enter anything in the search form).

Please help :)

Article.php

<?php

class Article extends DataObject {

static $db = array(
 	'Title' =>'Varchar(255)',
 	'Subtitle' => 'Varchar(255)',
 	'Summary' => 'Text',
 	'Credits'=>'Text',
 	'URLSegment'=>'Varchar(255)',
 	
 	"MetaTitle" => "Varchar(255)",
 	"MetaDescription" => "Text",
 	"MetaKeywords" => "Varchar(255)",
 	
 	"Published" => 'Boolean',
 	
 	"ToDo" => "Text"
 );
  
	function fieldLabels() {
		...
	}

	static $has_one = array(
		'Category' => 'Category',
		'Author'=>'Member'
	);
	
	static $has_many = array(
		'Pages' => 'ArticlePage',
		'Images' => 'ArticleImage'
	);
	
	static $casting = array(
		"LastEdited" => "SS_Datetime",
		"Created" => "SS_Datetime"
	);
			
	static $defaults = array(
		'Title'=>'New article',
		'URLSegment'=>'new-article'
	);

	static $can_create = true;
	
	static $summary_fields = array(
		'CategoryID',
		'Title',
		'AuthorID',
		'Subtitle',
		'URLSegment',
		'Created',
		'LastEdited'
	);
	
	static $searchable_fields = array(
		'CategoryID',
		'Title',
		'Subtitle',
		'Summary',
		'AuthorID',
		'Credits',
		'Created',
		'LastEdited',
		'Summary'
	);
	
	static $indexes = array (
		'URLSegment' => true
	);
	
	//*********CMS FIELDS
	
	public function getCMSFields()
	{	
		$pageManager = new DataObjectManager(
			$this, // Controller
			'Pages', // Source name
			'ArticlePage', // Source class
			array(
				'PageSubtitle' => 'Subtitle', 
				'CharCount' => 'Length of text (chars)',
				'ShortContent' => 'Text'
			), // Headings 
			'getCMSFields',  // Detail fields (function name or FieldSet object)
			'', 			// Filter clause
			'' 			// Sort clause
			// Join clause
		);
		$pageManager->setAddTitle(_t("Article.ADDPAGE","page"));
		$pageManager->setColumnWidths(array(
			'PageSubtitle' => 40, 
			'CharCount' => 20,
			'ShortContent' => 40
		));
		
		$photoManager = new ImageDataObjectManager(
			$this, // Controller
			'Images', // Source name
			'ArticleImage', // Source class
			'File', // File name on DataObject
			array(
				'Caption' => 'Caption'
			), // Headings 
			'getCMSFields'
		);
		$photoManager->setUploadFolder("gallery");
		$photoManager->setAddTitle(_t("Article.ADDPHOTO","photo"));
		
		$authorField = new DropdownField( 
			'AuthorID', 
			_t("Article.PICKAUTHOR","Pick author"), 
			array(''=>_t("Article.SELECT","Select one")) + Dataobject::get("Member", "ID")->toDropdownMap()
		);
		
		$categoryField = new DropdownField( 
			'CategoryID', 
			_t("Article.PICKCATEGORY","Pick category"), 
			array(''=>_t("Article.SELECT","Select one")) + Dataobject::get("Category", "ID", "Title")->toDropdownMap()
		);
		
		if($this->ID) {
		$extraFields = new TabSet ("Root",
			$contentTab = new Tab(_t("Article.TABCONTENT", "Content"),
				$categoryField,
				$authorField,
				new TextField("Credits", $this->fieldLabel('Credits')),
				new TextField("Title", $this->fieldLabel('Title')),
				new TextField("Subtitle", $this->fieldLabel('Subtitle')),
				new TextareaField("Summary", $this->fieldLabel('Summary'))
			),
			$pageTab = new Tab(_t("Article.TABPAGES","Strani"),
				$pageManager
			),
			$metaTab = new Tab("Meta",
				new TextField("URLSegment", $this->fieldLabel('URLSegment')),
				new TextField("MetaTitle", $this->fieldLabel('MetaTitle')),
				new TextareaField("MetaKeywords", $this->fieldLabel('MetaKeywords'), 1),
				new TextareaField("MetaDescription", $this->fieldLabel('MetaDescription'))
			),
			$photoTab = new Tab(_t('Article.TABPHOTO', 'Slike'),
				$photoManager
			),
			$tabPublish = new Tab(_t('Article.TABPUBLISH', 'Objava'),
				new DatetimeField_Readonly("Created",$this->fieldLabel('Created')),
				new DatetimeField_Readonly("LastEdited",$this->fieldLabel('LastEdited')),
				new CheckboxField("Published",$this->fieldLabel('Published'))
			),
			$tabToDo = new Tab(_t('Article.TABTODO', 'Opomniki'),
				//new LiteralField("ToDoHelp","Tekst To-Do"),
				new TextareaField("ToDo", "", 10)
			)
		);
		} else {
			$extraFields = new TabSet ("Root",
				$contentTab = new Tab(_t("Article.TABCONTENT", "Vsebina"),
					new TextField("Title", _t('Article.TITLE',"Naslov članka")),
					new TextField("Subtitle", _t('Article.SUBTITLE',"Podnaslov	 članka")),
					$authorField,
					new TextField("Credits", _t('Article.CREDITS',"Ostali soavtorji")),
					new TextareaField("Summary", _t('Article.SUMMARY',"Povzetek članka"))
				)
			);	
		}
		
		$f = new FieldSet(
			$extraFields
		);	
			
		return $f;
	}
	
	function onBeforeWrite() {
		if((!$this->URLSegment || $this->URLSegment=='nov-clanek') && $this->Title !='Nov članek') {
			$this->URLSegment = SiteTree::generateURLSegment($this->Title);
		}
		else if ($this->isChanged('URLSegment')) {
			$segment = preg_replace('/[^A-Za-z0-9]+/','-',$this->URLSegment);
			$segment = preg_replace('/-+/','-',$segment);
			
			if(!$segment) {
				$segment="clanek-$this->ID";
			}
			$this->URLSegment = $segment;	
		}
		
		$count=2;
		while($this->LookForExistingURLSegment($this->URLSegment)) {
			$this->URLSegment = preg_replace('/-[0-9]+$/', null, $this->URLSegment).'-'.$count;
			$count++;
		}
		parent::onBeforeWrite();
		
	}
	
	function LookForExistingURLSegment($URLSegment) {
		return(DataObject::get_one('Article', "URLSegment = '".$URLSegment."' AND ID != ".$this->ID));
	}
	
	public function AuthorName() {
		return $this->Author()->FirstName." ".$this->Author()->Surname;
	}
	
	public function isPublished() {
		return $this->Published ? _t("Article.YES","Da") : _t("Article.NO","Ne");
	}
}

ArticleAdmin.php

class ArticleAdmin extends ModelAdmin {
 
  public static $managed_models = array( 
      'Article'
   );
 
  static $url_segment = 'articles';
  static $menu_title = 'Article Admin';
  public $showImportForm = false;
}