Last Insert ID is NULL in Laravel

Question

I'm trying to get the last insert ID like so:

$leadData = [
            'first_name'        => $first_name,    
            'last_name'         => $last_name,
            'phone_number'      => $phone_number,  
            'company'           => $company,     
            'email_address'     => $email_address, 
            'iso_code'          => $iso_code,     
            'product'           => $product,       
            'transaction_id'    => $transaction_id,
            'rep_name'          => $rep_name,
            'ip_address'        => $ip_address
        ];

        //insert lead into DB
        $lead = new Lead();
        $lead->create($leadData);
        //dd($lead);
        $leadId = $lead->id;
        dd($leadId);

but $leadId is NULL every time. My record is being inserted correctly into the MySQL table. Its a seemingly stupid problem, but has had me stumped for the last hour.

How could $leadID possibly be null?

Answer 1

Just keep create object to one variable and print this print this variable object

//insert lead into DB
$lead = new Lead();
$lead->create($leadData);
//dd($lead);
$leadId = $lead->id;
dd($leadId);

to

$lead = new Lead();
$leadData = $lead->create($lead);
//dd($leadData);
$leadId = $leadData->id;
dd($leadId)

Answer 2

I figured it out, I had to first assign the return value of ->create() to a variable, and then use the ->id method as in my first example.

changing

$lead = new Lead();
$lead->create($leadData);
$leadId = $lead->id;

to

$lead = new Lead();
$result = $lead->create($leadData);
$leadId = $result->id;