title: How to add new fields to existing users
body: <p>I'm having a big deal - the meteor app I've been developing the last weeks is finally online. But, for an update, I need to add a field to my users profile.</p>
  
  <p>I thought that walling a methods with the following code would work :</p>
  
  <pre><code>updateUsrs_ResetHelps: function(){
    if(Meteor.users.update({}, {
      $set: {
        'profile.helps': []
      }
    }))
      console.log("All users profile updated : helps reset");
    else
      throw new Meteor.Error(500, 'Error 500: updateUsrs_ResetHelps', 
        'the update couldn\'t be performed');
  }
  </code></pre>
  
  <p>The problem is that my users have the classic Meteor.accounts document, whith emails, _id, services, profile, etc... but, in the profile, they don't have a .helps fields. I need to create it.</p>
  
  <p>For the future users, I've modified the accounts creation function to add this fields when they sign up, but for the 200 users I already got signed up, I do really need a solution.</p>
  
  <p>EDIT : Might it be because of the selector in the update ? Is a simple {} selector valid to update all the users / documents of the collection at once ?</p>