php - Laravel eloquent table structure -

i quite new laravel , eloquent world , i'm loving far, having trouble understating how structure tables , models in order me able crud data eloquents relationships. far have structured tables this:

users -----------------has_one------->onsite_teachers onsite_teachers -------has_many------>train_lines train_lines -----------has_many------>train_stations  train_lines -----------belongs_to---->text_train_lines train_stations --------belongs_to---->text_train_stations 

my question how best construct models me able crud using relationships. because have tried following no success:

$user = user::find(1); $user->onsite_teacher->train_lines()->save($data); $user->onsite_teacher->train_lines->train_stations()->save($data); 

it looks query wrong

try this:

$user = user::find(1); $user->onsite_teacher()->first()      ->train_lines()->save($data);