Merx - User blueprint

I use Merx plugin. My orders only stores user->uuid() as user infos, as users have to be logged in to place an order.
I want to put an ‘orders’ section in user blueprint, listing only user orders.
My user yml:

sections:
  orders:
    type: pages
    label: Commandes
    parent: site.find('commandes')
    template: order
    query: site.find('commandes').children.filterBy('user_uuid', user.uuid, '=')
    sortBy: num desc

But orders sections remains empty.

What type of fields is user_uuid?

that last param (=) doesn’t make sense, unless you separate values by that character.

Parent and template are superfluous when using a query

‘user_uuid’ is a text field.

What is wrote above about the parent and template is not correct, but the query needs to be:

    query: site.find('commandes').children.filterBy('user_uuid', user.uuid.id)

It works (with user.uuid and not user.uuid.id).
But is it possible as an admin to filter user orders when I click on user page ?
It looks like I can’t send the user page uuid to the query. It takes my admin’s uuid.