Hello everyone,
I have a design problem with Silverstripe 3.1. I do not know how to do.
I have 3 DataObject: Newspaper, Interview and Post.
A Newpaper has several Interviews and several Post. How to make in the Newspaper ModelAdmin, I can manage the order of Interviews and Posts inside a single DataGrid Field?

• Journal has_many Interview et Post
  
• Post and Interview has_one Journal

not sure to see exactly what you want but maybe this?

class JournalAdmin extends ModelAdmin {	
	private static $menu_title = 'Journal';	
	private static $url_segment = 'newspaper';
	private static $managed_models = array(
		'Journal',
		'Interview',
		'Post',
	);
}

but after reading again its more about displaying "interview" and "post" into the "journal" grid. isnt it?

but after reading again its more about displaying "interview" and "post" into the "journal" grid. isnt it?
yes it is !

Upon reflection, I found a solution using 2 dataobjects wich extend one basic dataobject : http://www.sspaste.com/paste/show/55f6bcd860218