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Good night everyone!

TypeError Argument 2 passed to CodeIgniter\Database\BaseBuilder::like() must be of the type string, null given, called in D:\xampp\htdocs\lordeCI\app\Controllers\AutocompleteSearch.php on line 31

Codeigniter is throwing this error for the chunk of code below, 'titulo' and 'post_id' are column names of a table called 'posts':

public function ajaxSearch()
    {
        helper(['form', 'url']);

        $data = [];

        $db      = \Config\Database::connect();
        $builder = $db->table('posts');   

        $query = $builder->like('titulo', $this->request->getVar('q')) //this is line 31
                    ->select('post_id, titulo as text')
                    ->limit(10)->get();
        $data = $query->getResult();
        
        echo json_encode($data);
    }

Also, some images aren't loading properly, the browser gives a status code: 200 though content-type is "text/html", i've checked the image path and it is correct. However the message below showed up in dev tools, network tab.

"DevTools failed to load SourceMap: Could not load content for chrome-extension://pmncamalnkoafdfdmojmhanhngjaakcb/browser-polyfill.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME"

Answer 1

For the exception

You are getting: You are passing empty value to the q param, the exception happens because it is like calling: $query = $builder->like('titulo', null), this cannot happen, only strings are accepted as the second parameter for the like method.

To solve this, validate your parameter before using it:

$titulo = '';
if ( ! empty( $titulo ) ) {
    $titulo = $this->request->getVar('q');
}
$query = $builder->like('titulo', $titulo);

A better way to do this is through Form Validation.

The images problem

You must check how you are returning your images to your client. If you return a image directly from an echo you will have this kind of error.

Best way is to solve this in your app server level.

The SourceMap error

Not that big of a problem, this will not hinder your application in anything. Take a look at this StackOverflow's question.