Can't get Laravel associate to work

Question

I'm not quite sure if I understand the associate method in Laravel. I understand the idea, but I can't seem to get it to work.

With this (distilled) code:

class User {      public function customer()     {         return $this->hasOne('Customer');     }  }  class Customer {      public function user()     {         return $this->belongsTo('User');     }  }  $user = new User($data); $customer = new Customer($customerData);  $user->customer()->associate($customer); 

I get a Call to undefined method Illuminate\Database\Query\Builder::associate() when I try to run this.

From what I can read, I do it exactly as is stated in the docs.

What am I doing wrong?

Answer 1

I have to admit that when I first started using Laravel the relationships where the part that I had to consistently refer back to the docs for and even then in some cases I didn't quite get it right.

To help you along, associate() is used to update a belongsTo() relationship. Looking at your code, the returned class from $user->customer() is a hasOne relationship class and will not have the associate method on it.

If you were to do it the other way round.

$user = new User($data); $customer = new Customer($customerData);  $customer->user()->associate($user); $customer->save(); 

It would work as $customer->user() is a belongsTo relationship.

To do this the other way round you would first save the user model and then save the customer model to it like:

$user = new User($data); $user->save();  $customer = new Customer($customerData); $user->customer()->save($customer); 

Edit: It may not be necessary to save the user model first but I've just always done that, not sure why.

Answer 2

As I understand it, ->associate() can onyl be called on a BelongsTo relationship. So, in your example, you could do $customer->user()->associate($user). However, in order to 'associate' a Has* relationship you use ->save(), so your code should be $user->customer()->save($customer)