public function prepareData() { $d = new T1(); $d->t1_id = 1; $d->t2_id = 1; $d->save(); $d = new T2(); $d->t2_id = 1; $d->hello_id = 10; $d->save(); for ($i = 0; $i < 10; $i++) { $t3 = new T3(); $t3->hello_id = 10; $t3->save(); } }