title: RavenDB query NOT contains
body: <p>I have collection of documents Users</p>
  
  <pre><code>User
  {
    "Status": "ACTIVE",
    "Login": {
      "UserName": "login",
      "Password": null,
      "CreationDate": "2011-12-07T11:30:24.4062500Z",
      "Roles": [
        {
          "Id": "roles/WebUser",
          "Name": "WebUser"
        },
        {
          "Id": "roles/Admin",
          "Name": "Admin"
        }
      ]
    },
  }
  </code></pre>
  
  <p>How can i make a query to get list of users with role name "WebUser" except users with role name "Admin" (Contains role "WebUser" but not contains role "Admin")</p>
  
  <p>Using LINQ or lucene</p>