Laravel One to One Relationship get object result is null - php

Question

Migration persons Table:
Schema::create('persons', function (Blueprint $table) {
$table->id();
$table->string("firstname");
$table->string("lastname");
$table->timestamps();
});
Migration passports Table:
Schema::create('passports', function (Blueprint $table) {
$table->id();
$table->string("identifystring")->unique();
$table->unsignedBigInteger("person_id");
$table->timestamps();
$table->foreign("person_id")->references("id")->on("persons")->onDelete("cascade");
});
Person model:
class Person extends Model
{
use HasFactory;
protected $table ="persons";
protected $fillable = [
"firstname",
"lastname"
];
public function passport() {
$this->hasOne(\App\Models\Passport::class, "passports.person_id","persons.id");
}
}
Passport Model:
class Passport extends Model
{
use HasFactory;
protected $table = "passports";
protected $fillable = [
"identifystring",
"person_id"
];
}
execute Code:
$person = \App\Models\Person::findOrFail(2);
dd($person->passport());
Result is: null

Answer 1

class Person extends Model
{
use HasFactory;
protected $table ="persons";
protected $fillable = [
"firstname",
"lastname"
];
public function passport() {
$this->hasOne(\App\Models\Passport::class, "person_id", "id");
}
}

Answer 2

You did not return the relation. just return it:
public function passport() {
return $this->hasOne(\App\Models\Passport::class, "passports.person_id","persons.id");
}

Answer 3

As per the migrations written. In the Person model write
public function passport() {
return $this->hasOne(\App\Models\Passport::class, "person_id","id");
}
and in the Passport model write
public function person() {
return $this->belongsTo(\App\Models\Person::class, 'id', 'person_id');
}
Execute the code
$person = \App\Models\Person::findOrFail(2)->passport;
dd($person);

Answer 4

Use this code.
In your Person Model
public function passport() {
return $this->hasOne(\App\Models\Passport::class);
}
In your passport model
public function person() {
return $this->belongsTo(\App\Models\Person::class, 'person_id');
}
Then try to pass the relation again by doing the same thing
$person = \App\Models\Person::findOrFail(2);
dd($person->passport());