Laravel 5.2 Eloquent: Why is my String Primary Key becoming 0?

Laravel 5.2: Custom Primary Key in Eloquent Causing Unexpected Value

When attempting to use a string as a primary key in a Laravel 5.2 Eloquent table, users may encounter an issue where the primary key value becomes 0. This arises from the default behavior of Laravel, which casts the primary key to an integer.

To resolve this issue, follow these steps:

1. In the Eloquent model class, specify the primary key using $primaryKey.
2. Set $incrementing to false, indicating that the primary key is not auto-incrementing.
3. For Laravel 6.0 and above, set $keyType to 'string' to explicitly define the type of the primary key.

For example:

class UserVerification extends Model
{
    protected $table = 'user_verification';
    protected $fillable =   [
                                'email',
                                'verification_token'
                            ];
    protected $primaryKey = 'verification_token';
    public $incrementing = false;
    protected $keyType = 'string'; // For Laravel 6.0+
}

By implementing these changes, Laravel will correctly handle the primary key as a string, resolving the issue of the primary key value becoming 0.

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