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DataObjectManager Module
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ManyManyDataObjectManager - Unable to Use Function Call $field_names Array?
12 July 2012 at 5:49am Last edited: 12 July 2012 5:52am
Hi,
I've been working with the DataObjectManager module for years, but today I came across a strange error (probably a mistake in my code that i can't see). I have a ManyManyDataObjectManager in my generic Page class like so:
<?php
class Page extends SiteTree {
.....
static $many_many = array(
"Buttons" => "Button"
);
function getCMSFields() {
$fields = parent::getCMSFields();
$buttons = new ManyManyDataObjectManager(
$this,
"Buttons", // relation name
"Button", // object class
Button::$field_names, // fields to show in table
Button::getCMSFields_forPopup(), // form that pops up for edit
"", // a filter to only display item associated with this page
"SortOrder ASC" // Sort
);
$fields->addFieldToTab("Root.Content.Buttons", $buttons);
return $fields;
}}
And here is my Button DataObject:
<?php
class Button extends DataObject {
static $db = array(
"Title" => "Text"
);
static $has_one = array(
"LinkedPage" => "SiteTree"
);
static $belongs_many_many = array(
"Pages" => "Page"
);
static $field_names = array(
"Title" => "Title",
"PageName" => "Page Name"
);
function getCMSFields_forPopup() {$fields = new FieldSet();
$fields->push(new TextField("Title", "Text"));
$LinkedPageField = new SimpleTreeDropdownField("LinkedPageID", "Link to Page", "SiteTree");
$LinkedPageField->setEmptyString("-- None --");
$fields->push($LinkedPageField);return $fields;
}
public function PageName() {
$PageObject = DataObject::get_by_id("SiteTree", $this->LinkedPageID);
return ($PageObject!=null) ? $PageObject->Title : "";
}
}The error when I click on a page in the CMS is:
Unknown column 'PageName' in 'field list'
Ha? I thought I could put function names in this associative array. It isn't meaningful to put the LinkedPageID itself in the display table, which is why I am calling PageName() instead. Indeed, I can't use LinkedPageID here either or I get this error:
Duplicate column name 'LinkedPageID'
What am I doing wrong here?
Thanks in advance,
Garrett
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