Zend Framework Sql not finding column - zend-framework2

Question

I'm having an issue with Zend Framework 2's SQL class. It's saying it cannot find a certain column in the table but the column is there. I've run into this problem before and had to use actual SQL syntax instead of building the query. I rather not have to resort to putting the actual syntax in and instead figure out why this is happening so I can avoid having this issue in the future.
Here is my code:
namespace Members\Model;
use Zend\Db\TableGateway\TableGateway;
use Zend\Db\Sql\Sql;
use Zend\Db\Sql\Select;
use Zend\Db\Adapter\Adapter;
use Zend\Db\Sql\Predicate;
use Members\Model\Interfaces\FeedInterface;
use Members\Model\Exceptions\FeedException;
class FeedModel implements FeedInterface
{
/**
* #var TableGateway
*/
public $gateway;
/**
* #var string
*/
public $user;
/**
* #var Sql
*/
public $sql;
/**
* #var Select
*/
public $select;
/**
* Constructor method for FeedModel class
* #param TableGateway $gateway
* #param string $user
*/
public function __construct(TableGateway $gateway, $user)
{
$this->gateway = $gateway instanceof TableGateway ? $gateway : null;
$this->select = new Select();
$this->sql = new Sql($this->gateway->getAdapter());
$this->user = $user;
}
/**
* {#inheritDoc}
* #see \Members\Model\Interfaces\FeedInterface::listFriendsStatus()
*/
public function listFriendsStatus()
{
// get the friend ids based on user id
// and then compare the friend id to the id in status table
$friend_query = $this->select->columns(array('*'))
->from('friends')
->where(array('user_id' => $this->getUserId()['id'])); // the issue
file_put_contents(getcwd() . '/public/query.txt', $this->sql->buildSqlString($friend_query));
$query = $this->sql->getAdapter()->query(
$this->sql->buildSqlString($friend_query),
Adapter::QUERY_MODE_EXECUTE
);
if ($query->count() > 0) {
$friend_id = array();
foreach ($query as $result) {
$friend_id[] = $result;
}
$this->select->columns(array('status'))
->from('status')
->where(array('id' => array_values($friend_id), new Predicate\IsNotNull('id')));
$status_query = $this->sql->getAdapter()->query(
$this->sql->buildSqlString($this->select),
Adapter::QUERY_MODE_EXECUTE
);
if ($status_query->count() > 0) {
// check if a image was used
$this->select->columns('username')
->from('members')
->where(array('id' => array_values($friend_id), new Predicate\IsNotNull('id')));
$image_query = $this->sql->getAdapter()->query(
$this->sql->buildSqlString($this->select),
Adapter::QUERY_MODE_EXECUTE
);
if ($image_query->count() > 0) {
$status_dir = array();
foreach ($image_query as $value) {
if (#!is_dir(getcwd() . '/public/images/profile/' . $value['username'] . '/status/')) {
continue;
}
$status_dir[] = getcwd() . '/public/images/profile/' . $value['username'] . '/status/';
}
$images = array();
// retrieve the image inside the status directory
foreach (array_diff(scandir($status_dir, 1), array('.', '..')) as $values) {
$images[] = $values;
}
} else {
throw new FeedException("The user does not exist in the user table.");
}
$status = array();
// get all the statuses
foreach ($status_query as $rows) {
$status[] = $rows;
}
return array('status' => $status, 'images' => $images);
} else {
throw new FeedException("No status was found for your friends.");
}
} else {
throw new FeedException(sprintf("Could not locate any friends for %s", $this->user));
}
}
/**
* {#inheritDoc}
* #see \Members\Model\Interfaces\FeedInterface::hideFriendsStatus()
*/
public function hideFriendsStatus($friend_id)
{
}
/**
* Grabs the user id for the user
*
* #return int|boolean
*/
public function getUserId()
{
$this->select->columns(array('*'))
->from('members')
->where(array('username' => $this->user));
$query = $this->sql->getAdapter()->query(
$this->sql->buildSqlString($this->select),
Adapter::QUERY_MODE_EXECUTE
);
if ($query->count() > 0) {
foreach ($query as $result) {
$row = $result;
}
return $row;
}
return false;
}
}
This is the exception message I am getting:
PDOException: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'user_id' in 'where clause'
But as you can see in this screenshot, the column user_id exists in the friends table I have in place:
So my question is why is it doing this and how can I in the future avoid this issue?
Thanks!

Answer 1

It looks like the select is causing the issue.
Since your code ->from('friends') is called first and then it is overridden due to this function call $this->getUserId(), which overrides the friends table to members due to ->from('members').
Try changing your code to.
$userId = $this->getUserId()['id'];
$friend_query = $this->select->columns(array('*'))
->from('friends')
->where(array('user_id' => $userId));
This should work, but if it doesn't, try to just create new select object $select = new Select(); in both the functions rather than $this->select = new Select();.