当同一模型也存在 HasMany 关系时，如何更新 HasOne 关系?

My Organization class has many Contacts:

public function contacts()
{
    return $this->hasMany(Contact::class);
}

And likewise, my Contact class reflects this relationship:

public function organization()
{
    return $this->belongsTo(Organization::class);
}

But also, each Organization has exactly one "primary" Contact. I am using a table column organizations.primary_contact_id to identify which one:

public function primaryContact()
{
    return $this->hasOne(Contact::class, 'id', 'primary_contact_id');
}

From here, I'm stuck. The reverse relationship in Contact already exists, so I wrote another function I thought would do the trick, figuring if I updated the value in the parent table, Eloquent would naturally fetch the corresponding record in the contacts table since I defined the relationship:

/**
 * @param AppContact
 */
public function setPrimaryContact($contact)
{
    $this->primary_contact_id = $contact->id;
    $this->save;
}

But it doesn't:

>>> $org = Organization::find(17)
=> AppOrganization {#2923
     id: 17,
     name: "Test Org",
     primary_contact_id: 33,
   }
>>> $alice= $org->primaryContact
=> AppContact {#2938
     id: 33,
     organization_id: 17,
     fname: "Alice",
     lname: "Abbot",
   }
>>> $bob = Contact::find(34)
=> AppContact {#2939
     id: 34,
     organization_id: 17,
     fname: "Bob",
     lname: "Baker",
   }
>>> $org->setPrimaryContact($bob)
=> null
>>> $org
=> AppOrganization {#2923
     id: 17,
     name: "Test Org",
     primary_contact_id: 34,
     primaryContact: AppContact {#2938
       id: 33,
       organization_id: 17,
       fname: "Alice",
       lname: "Abbot",
     },
   }

You can see setPrimaryContact($bob) executed fine, as primary_contact_id got updated to Bob's id, but primaryContact still lists Alice.

Why is primaryContact not returning the correct object?

• Your setPrimaryContact method won't update your table, because you call $this->save, not $this->save(), save is a method
• After $org->setPrimaryContact($bob), you should call $org-> primaryContact->refresh() to get the updated record.

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