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Michael Cook
Full Stack JavaScript Techdegree Graduate 28,975 PointsCan someone look at this method and explain why a new listing object is created and added to the collection?
I am doing the Extending OOPHP course and I am going through the code base for the example project and trying to understand it line by line. The repo can be found at: https://github.com/treehouse/extend-oo-php/tree/master/basic-directory-code
In the update method in the collection object where a listing is updated, a new listing object is created and added to the array collection. I just can't understand why, because if you add a new listing object then you should have the old listing and the new one. That doesn't make sense to me, or maybe I am missing something. Here is the method:
/**
* Filter incoming dataUpdate listing
*
* @param array $data User Data
*
* @return integer Indicates the number of records updated
*/
public function update($data)
{
// filter incoming data
$data = array_filter($data);
// add a new listing
// THIS IS THE LINE I AM SO CONFUSED ABOUT:
$this->addListing($data);
/* create a sql statement to update the data in the listings table
using the array keys to bind values */
$sql = 'UPDATE listings SET ';
foreach (array_keys($data) as $key) {
if ($key != 'id') {
$sql .= " $key = :$key, ";
}
}
$sql = substr($sql, 0, -2);
$sql .= ' WHERE id = :id';
// prepare the sql statement
$statement = $this->db->prepare($sql);
// try binding parameters and executing the statement
try {
$statement->execute($data);
} catch (Exception $e) {
echo $e->getMessage();
}
// set an alert based on whether the update was successful or not
if ($statement->rowCount() > 0) {
$this->setAlert(
'success',
'<strong>Update listing successful!</strong> ' . $data['title']
);
} else {
$this->setAlert('danger', 'Unable to update listing');
}
//return the count of affected rows
return $statement->rowCount();
}
I know this is a lot of code to look at but it would be good practice for someone else to help me analyse and understand it. Thanks,
