I have created a data object and can view the data on one page but I am having trouble understanding how to view it on multiple pages.

My data object:

class AgsMember extends DataObject {
     public static $db = array(
       //......removed for readability
    );

     // One-to-one relationship 
    public static $has_one = array(
        'ProfilePicture' => 'Image',
        'AgsMemberPage' => 'AgsMemberPage'
        //=====================================
        //should I be adding the other page here?        
    );

    // Summary fields
    public static $summary_fields = array(
    ///...............removed for readability
    );

    public function getCMSFields_forPopup() {
    //.....................
        );
    }
}

class AgsMemberPage extends Page{
    private static $has_many = array(
      'AgsMembers'=>'AgsMember'
    );
    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
        $fields->addFieldToTab('Root.AgsMember', GridField::create(
            'Ags Member',
            'Ags Member List',
            $this->AgsMembers(),
            GridFieldConfig_RecordEditor::create()
        ));

        return $fields;
    }
}

class AgsMemberPage_Controller extends Page_Controller{
	public function init() {
        parent::init();

        }
}

But I can not utilize it on another page

class MemberDirectoryPage extends Page {
    private static $has_many = array(
      'AgsMembers'=>'AgsMember'
    );
    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
        return $fields;
    }
}

class memberDirectoryPage_Controller extends Page_Controller{
	public function init() {
        parent::init();
    }
}

Hi,

The issue here is that the AgsMember class is being tied to one page type (AgsMemberPage), in the $has_one array 'AgsMemberPage' => 'AgsMemberPage' so cannot also belong to the MemberDirectoryPage. $has_many is just the other end of the $has_one relation, so 2 has_many's and 1 has_one does not match up.

I don't really understand why members need to be tied to a particular page type; personally I would create AgsMembers independent of any pages with its own Model Admin to manage them in the CMS. But the main part of the solution is in the second page type, if I understand what you want to do...

If you just want to output all of the members on the MemberDirectoryPage, say looping through them in the template and outputting a list on the screen, remove the $has_many and create a function called something like AgsMembers(), then in this function you can get all the AgsMembers in the database and return them to the template for output, no relation between the members and the directory page is required.

class MemberDirectoryPage extends Page {
    public function getCMSFields()
    {
        $fields = parent::getCMSFields();
        return $fields;
    }
}

class memberDirectoryPage_Controller extends Page_Controller{
	public function init() {
        parent::init();
    }

   public function AgsMembers() {
      return AgsMembers::get();   // Just get all members in the DB and return.
  }
}

Then in the template (.ss) for the MemberDirectory page...

<ul>
  <% loop $AgsMembers %>
    <li>$Name</li>
  <% end_loop %>
</ul>

If you did want to utilise the members on another page where, for example, only the members a CMS user/admin selects appear on the directory and not all. Then that is a slightly different solution involving the $many_many relation.

In this case the code for the AgsDirectory page would be as follows...

class MemberDirectoryPage extends Page {
  
  public static $many_many = array(
    'SelectedMembers' => 'AgsMember'
  ) ;

  public function getCMSFields()
    {
        $fields = parent::getCMSFields();

        $fields->addFieldToTab('Root.AgsMember', GridField::create(
            'SelectedMembers',
            'Selected Members',
            $this->SelectedMembers(),
            GridFieldConfig_RelationEditor::create()
        ));

        return $fields;
    }
}

class memberDirectoryPage_Controller extends Page_Controller{
	public function init() {
        parent::init();
    }
}

And the template code for the directory page...

<ul>
  <% loop $SelectedMembers %>
    <li>$Name</li>
  <% end_loop %>
</ul>

Regards,
DouG