Posts categorized “PHP”.

Reordering Yii Results Without Another Select

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In case you weren’t aware, you can reorder the results you already have from a previous Yii call. For example…

 
$users = User::model()->findByPk(2);
$posts = $user->posts(array('order'=>' created Desc '));

There were just ordered our users posts by created date descending.

We can also do filtering…

 
$users = User::model()->findByPk(2);
$posts = $user->posts(array('condition'=>' status=1 '));

So now we only have active posts. We could also combine a condition and a status.

You can find out more here: http://www.yiiframework.com/doc/guide/1.1/en/database.arr#dynamic-relational-query-options

Yii (and Yii2) UpdateAll Example

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This is a simple example of how to use Yii’s updateAll():

In this example we want to set status = 1 WHERE type_id = 1 AND status = 0

Note this is a simple example where we are only updating one column and using a string for our condition. There are more complex options available.

Comment::model()->updateAll(array( 'status' => 1 ), 'type_id = 1 AND status = 0' );

So as you can see first comes an array of column => new_value pairs, then a condition string which is pretty much used as the WHERE clause.

An example of updating more than one column:

Comment::model()->updateAll(array( 'status' => 1, 'updated' => '2011-08-25 09:33:23' ), 'type_id = 1 AND status = 0 ' );

Update. Yii2 example:

Updating a single column:

Comment::updateAll(['status' => 1], 'type_id = 1 AND status = 0');

Updating multiple columns:

Comment::updateAll(['status' => 1, 'updated' => '2011-08-25 09:33:23'], 'type_id = 1 AND status = 0' );

Yii – “Model.id” not defined for CArrayDataProvider and CSqlDataProvider etc

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There is a Yii error I come across every now and again, and each time it stumps me.

If you ever get SomeModel.id not defined error when trying to put your dataprovider results into a cgridview or similar then it’s likely because

1) Your model doesn’t have an id column, it might use file_id or user_id etc instead and

2) You haven’t defined which other column should be used.

We do this using what’s known as keyField:


new CArrayDataProvider($users, array('keyField' => 'user_id'));
new CSqlDataProvider($users, array('keyField' => 'user_id'));

Yii – Rewrite file or image urls for download or display

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I recently had a need to track files and images which were uploaded and for their urls to be secret. This meant that they couldn’t sit in a folder waiting to be found and had to be saved below the site root.

To get access to them I wanted to the check the user permissions followed by forcing download of all files (including images). Here are the steps I took to accomplish this…

For the sake of this page, my (fake) file urls are something like:

example.com/user/123/file/456.pdf

Update the urlmanager to rewrite files to my filemanager/view:

 
	'user/<user_id:\d+>/file/<id:\d+>.[a-z0-9]+' => 'filemanager/view',

Update the filemanager class’ actionView function:

 
	public function actionView($id)
	{
		$file = $this->loadModel($id);
 
		header("Pragma: public"); // required
		header("Expires: 0");
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Cache-Control: private",false); // required for certain browsers 
		//header("Content-Type: " . $file->mime_type);
		header("Content-Disposition: attachment; filename=\"" . str_replace(" ", "-", preg_replace("@[^a-z0-9 ]@", "", strtolower($file->file_name))) . '.' . $file->file_extension . "\";" );
		header("Content-Transfer-Encoding: binary");
		header("Content-Length: ".filesize(Yii::app()->basePath . '/../../uploads/user_files/' . $file->file_id . '.' . $file->file_extension));
		readfile(Yii::app()->basePath . '/../../uploads/user_files/' . $file->file_id . '.' . $file->file_extension);
		exit();
 
	}

I also of course required filemanager access to be strict:

 
	public function accessRules()
	{
		return array(
			array('allow', 
				'actions'=>array('view', 'create','delete'),
				'users'=>array(),
				'expression' => 'User::model()->hasRightsToFile()',
			),
			array('deny',  // deny all users
				'users'=>array('*'),
			),
		);
	}

And that’s about it. Controlled and forced file download with rewritten file urls.

Yii – Only fill filter dropdown with used options

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Sometimes you want to show a filter dropdown but by default it will show all value options even if not assigned to anything. You can use findAll with criteria to only bring back items which are in use…

 
$criteria = new CDbCriteria;
$criteria->join = 'INNER JOIN organisation ON organisation.category_id = t.category_id';
 
if($_GET['school_id'])
{
	$criteria->condition = 'organisation.school_id = ' . $_GET['school_id'];
}
else
{
 
}
 
$categories = OrganisationCategory::model()->findAll($criteria);
$categories_array = array();
foreach($categories as $category)
{
	$categories_array[$category->category_id] = $category->name;
}
 
 
$columns = array(
	'name',
	array(
		'name'=>'category_id',
		'value' => 'OrganisationCategory::model()->findByPk($data->category_id)->name',
		'filter' => $categories_array
[...]