title: Need advices with Symfony2
body: <p>I've understood the routing principle consisting in creating routes and call them from twig templates.
  When calling, we can pass parameters to the route which will be included in the url.</p>
  
  <p>I'm in the following case, I have an object called "Object" and each object can belong to other objects called "Category".
  In my twig template, I display all my objects line by line (each row contains the object information and a checkbox to select it).
  I have also a button "send", I'd like to click this button and edit all the selected objects.</p>
  
  <p>However I don't think I can do this with a route because I don't know by advance how many elements will be selected (so I don't know the number of parameters to the route).</p>
  
  <p>I'd like to know how you would do this.</p>