Laravel多态关系

Question

What is the best method to handle an instance where there is no record for the polymorphic object.

   user_type A table ( user_id , username )

   user_type B table (user_id , username )

   event table (event_id, user_id, user_type )

Sample Data

A_table user_id , username 1 , sam 2 , john

B_table user_id, username 1, Don 2, Mike

Event_table event_id, user_id, user_type 1,1,A // Record 1 2,2,B // Record 2 1,5,A // Record 3

Consider the following pseudo code :
Event instance ->user->username

1) Running the above for Record 1 Should result in "Sam" 2) Running the above for Record 2 Should result in "Mike"

Imagine a 3rd case :

Where as "Event instance ->user" results in NULL.

How do we best tackle a situation like this apart from having to always check if the Object is null or not before every instance we use it.

Answer 1

The best method to go around this was to do a simple :

if ( ! $this->polymorfphic_object_method)
{
  // skip now
}