在SilverStripe中获取has_one关系

Question

I have a DataObject called Applicant and it $has_one Member (this is the SilverStripe Member class).

private static $has_one = array (
    'MemberApplicant' => 'Member'
);

When a member is logged in and visits the ApplicationPage I want to be able to populate the form based on the members Applicant data.

I can make this work but I feel like I should be able to access the data easier.

Here is what I do:

$memberID = Member::currentUserID();
$applicant = Applicant::get()->filter('MemberApplicantID', $memberID)->first();

$form->loadDataFrom($applicant);

Shouldn't I be able to instantiate a Member and then call its relative $MemberApplicant?

Answer 1

Shouldn't I be able to instantiate a Member and then call its relative $MemberApplicant?

Of course. I assume you have a 1:1 relation, then you have to define the counter part on Member using $belongs_to (see this diagram)

class Applicant extends DataObject
{
private static $has_one = [
    'MemberApplicant' => 'Member'
];
...

class MemberApplicantExtenension extends DataExtension
{
private static $belongs_to = [
    'Applicant' => 'Applicant'
];

...

Now add the DataExtension to the Member object in /mysite/_config/config.yml

Member:
  extensions:
    - MemberApplicantExtenension

and run a dev/build?flush.

Now you're able to get the related Applicant from the Member using built in ORM magic:

//Get the current Member
$member = Member::CurrentUser();

//get the $belongs_to
$applicant = $member->Applicant();