Users' names do not show in details (but are ok in form)

[tali]

Hi,

To table Events I have joined a repeated group of users : those who will attend the event.
On the form, I have correct names

Form
...
  Repeat group of users
  Name 1   V  [V stands for dropdown]
  Name 2   V
  ...
  Name n   V

but in the details, I do not see the names

Details
...
  Repeat group of users
  _
  _
  ...
  Name 2

except the last name which is falsely set to the name of the connected user (here Name 2)

 

[tali]

The solution is just to use instead a databasejoin plugin element with default eval

$user = JFactory::getUser();
return $user->id;

So what is the use of a user plugin?
And why it does not just behave like a databasejoin plugin (see first post)?