silverstripe-blog/code/model/BlogTag.php

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<?php
/**
* A blog tag for keyword descriptions of a blog post.
*
* @package silverstripe
* @subpackage blog
*
* @method Blog Blog()
*
* @property string $Title
* @property string $URLSegment
* @property int $BlogID
*/
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class BlogTag extends DataObject implements CategorisationObject
{
/**
* Use an exception code so that attempted writes can continue on
* duplicate errors.
*
* @const string
* This must be a string because ValidationException has decided we can't use int
*/
const DUPLICATE_EXCEPTION = "DUPLICATE";
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/**
* @var array
*/
private static $db = array(
'Title' => 'Varchar(255)',
);
/**
* @var array
*/
private static $has_one = array(
'Blog' => 'Blog',
);
/**
* @var array
*/
private static $belongs_many_many = array(
'BlogPosts' => 'BlogPost',
);
/**
* @var array
*/
private static $extensions = array(
'URLSegmentExtension',
);
/**
* @return DataList
*/
public function BlogPosts()
{
$blogPosts = parent::BlogPosts();
$this->extend("updateGetBlogPosts", $blogPosts);
return $blogPosts;
}
/**
* {@inheritdoc}
*/
public function getCMSFields()
{
$fields = new FieldList(
TextField::create('Title', _t('BlogTag.Title', 'Title'))
);
$this->extend('updateCMSFields', $fields);
return $fields;
}
/**
* {@inheritdoc}
*/
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public function validate()
{
$validation = parent::validate();
if($validation->valid()) {
// Check for duplicate tags
$blog = $this->Blog();
if($blog && $blog->exists()) {
$existing = $blog->Tags()->filter('Title', $this->Title);
if($this->ID) {
$existing = $existing->exclude('ID', $this->ID);
}
if($existing->count() > 0) {
$validation->error(_t(
'BlogTag.Duplicate',
'A blog tags already exists with that name'
), BlogTag::DUPLICATE_EXCEPTION);
}
}
}
return $validation;
}
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/**
* Returns a relative URL for the tag link.
*
* @return string
*/
public function getLink()
{
return Controller::join_links($this->Blog()->Link(), 'tag', $this->URLSegment);
}
/**
* Inherits from the parent blog or can be overwritten using a DataExtension.
*
* @param null|Member $member
*
* @return bool
*/
public function canView($member = null)
{
$extended = $this->extendedCan(__FUNCTION__, $member);
if ($extended !== null) {
return $extended;
}
return $this->Blog()->canView($member);
}
/**
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* {@inheritdoc}
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*/
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public function canCreate($member = null, $context = array())
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{
$extended = $this->extendedCan(__FUNCTION__, $member);
if ($extended !== null) {
return $extended;
}
$permission = Blog::config()->grant_user_permission;
return Permission::checkMember($member, $permission);
}
/**
* Inherits from the parent blog or can be overwritten using a DataExtension.
*
* @param null|Member $member
*
* @return bool
*/
public function canDelete($member = null)
{
$extended = $this->extendedCan(__FUNCTION__, $member);
if ($extended !== null) {
return $extended;
}
return $this->Blog()->canEdit($member);
}
/**
* Inherits from the parent blog or can be overwritten using a DataExtension.
*
* @param null|Member $member
*
* @return bool
*/
public function canEdit($member = null)
{
$extended = $this->extendedCan(__FUNCTION__, $member);
if ($extended !== null) {
return $extended;
}
return $this->Blog()->canEdit($member);
}
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}