Hi,
I want to use HTMLEditor field in ModelAdmin, but when I click on icon like (image, url) in HTML editor I get this error
[User Error] ModelAdmin::init(): Invalid Model class

How can use HTML editor field in ModelAdmin?

example:

class TaskModelAdmin extends ModelAdmin
{
	static $url_segment = 'task';
	static $menu_title = 'Tasks';
	
	static $menu_priority = 1;
	
	public $showImportForm = false;
	
	//static $url_priority = 50;
	
	public static $managed_models = array('Task');
}

class Task extends DataObject
{
	public static $db = array(
		'Name' => 'Varchar(500)',
		'Description' => 'HTMLText',
		'Bug' => 'Boolean',
		'StartDate' => 'Date',
		'EndDate' => 'Date'
	);
}

I'm also having this issue. Were you able to figure anything out?

Yep, definitely an issue.

http://logs.simon.geek.nz/index.php?date=2012-09-14
http://logs.simon.geek.nz/index.php?date=2012-07-04

This can be added to your ModelAdmin subclass to produce a different output from /admin/[modeladminclass]/EditorToolbar/LinkForm/forTemplate

Temporary solution (tested minimally):

class ModelAdminHtmlEditorField_Toolbar extends HtmlEditorField_Toolbar {
public function forTemplate() {
return sprintf(
'<div id="cms-editor-dialogs" data-url-linkform="%s" data-url-mediaform="%s"></div>',
Controller::join_links($this->controller->Link(), $this->name, 'LinkForm', 'forTemplate'),
Controller::join_links($this->controller->Link(), $this->name, 'MediaForm', 'forTemplate')
);
}
}

In your ModelAdmin subclass:

public function EditorToolbar() {
return new ModelAdminHtmlEditorField_Toolbar($this, $this->name."/EditorToolbar");
}

What build of SilverStripe 3 are you using? Just tried to add a HTMLEditor in 3.0.2 (rc2 I think) and it seems to work fine there, uploading images and all...

I'm having this issue too.

http://open.silverstripe.org/ticket/7646

I can also confirm this issue but it looks like 'SamTheJarvis' fix where you setup a new class in your code directory and update your model admin class fixes the issue. As a note, I only seem to get this issue when you 1, search for something in model admin and then go to add a link etc.

If I come in on new session, login, go to the model admin and then choose to add a link, seems to work just fine. So not sure what is happening but seems like maybe something is getting messed up in the routing.

Thanks Sam for a work around

If I come in on new session, login, go to the model admin and then choose to add a link, seems to work just fine.

This is because you're working with the cached version of the HTMLEditorField from Pages in this moment. If you ?flush the ModelAdmin, a new cached version for ModelAdmin will be created and the link to MediaForm and LinkForm in ModelAdmin will fail.

This patch worked for us too. Thanks for sharing it!!