Laravel 5.2 Model User->Invoice->InvoiceDetails - php

Question

I have 3 models and i don't know which relationship do i need to write for each model
User | Invoice | InvoiceDetails
A User can have many Invoices and one Invoice is made by only one User.
So in User Class i write:
public function invoice(){
return $this->hasMany('App\Invoice');
}
and inside Invoice Class i write:
public function user(){
return $this->belongsTo('App\User');
}
Is this ^ correct?
And now, one Invoice has one InvoiceDetail does that mean for each Invoice there is only one row in table invoice_details?
I just don't know what to write inside each model, how to connect them?
I have made a little schema just to show what it should be like:
So the question is, which functions to write inside each Model to declare proper connections between them?

Answer 1

What you've written so far is fine, it links users to invoices properly (almost). The only thing is you need to rename owner_id to user_id, or specify that it should use the owner_id field.
User class
// Note that the function should be plural as it's for many
public function invoices(){
return $this->hasMany('App\Invoice', 'owner_id', 'ID');
}
Invoice class
public function user(){
return $this->belongsTo('App\User', 'ID', 'owener_id');
}
Then you just need to define the relationship with InvoiceDetails
Invoice class
public function invoiceDetails()
{
return $this->hasMany('App\InvoiceDetails');
}
InvoiceDetails class
public function invoice()
{
return $this->belongsTo('App\Invoice');
}