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+--- Thread: Query builder question (CI 4 newbie) (/showthread.php?tid=79788)
Query builder question (CI 4 newbie) - bastian - 07-27-2021
Hi there
I started making my first steps with CI4 after years of experience with CI. Now I'm struggling with something that worked fine with query builder prior to CI4.
Here are two functions of a basic model:
PHP Code:
public function getThread($id, $field = NULL) {
$query = $this->db->table('threads')
->where('id', $id)
->get();
$thread = $query->getRow();
if ($thread == FALSE) {
return FALSE;
}
$thread->posts = $this->basicModel->getPostsByThread($thread->id);
if (is_null($field)) {
return $thread;
}
else {
return $thread->$field;
}
}
public function getPostsByThread($thread_id) {
$query = $this->db->table('posts')
->where('thread_id', $thread_id)
->orderBy('date')
->get();
return $query->getResult();
}
So, when calling function getThread() CI4 return the following error caused by the line $thread->posts = …:
Quote:CodeIgniter\Database\Exceptions\DatabaseException #8
You must set the database table to be used with your query.
I guess I have to rethink using query builder. Maybe you can give me a hint.
RE: Query builder question (CI 4 newbie) - InsiteFX - 07-27-2021
PHP Code:
$db = \Config\Database::connect();
$builder = $db->table('users');
RE: Query builder question (CI 4 newbie) - bastian - 07-27-2021
Thanks for your answer.
Database connection is done automatically when extending the model with Model class, right?
What's the difference between
PHP Code:
$builder = $db->table('users')
and
PHP Code:
$query = $this->db->table('users')…
RE: Query builder question (CI 4 newbie) - ikesela - 07-27-2021
YOUR CODE ABOVE:
$thread->posts = $this->basicModel->getPostsByThread($thread->id);
shoud be only this
$thread->posts = $this->getPostsByThread($thread->id); // why need basicModel ?? if u can call direct
SECOND:
same, since instance is shared.
1) you need to get the instance first , $db = db_connect();
2) instance from parent class (model) , $this->db;
RE: Query builder question (CI 4 newbie) - bastian - 07-27-2021
Ah, now it's working!
$this->basicModel->… was wrong. It must be $this->… directly, as you mentioned.