title: Get nested fields with MongoDB shell
body: <p>I've "users" collection with a "watchlists" field, which have many inner fields too, one of that is "arrangeable_values" (the second field within "watchlists"). </p>
  
  <p>I need to find for each user in "users" collection, each "arrangeable_values" within "watchlists".</p>
  
  <p>How can I do that with mongodb shell ?</p>
  
  <p>Here is an example of data model :</p>
  
  <pre><code>&gt; db.users.findOne({'nickname': 'superj'})
  {
      "_id" : ObjectId("4f6c42f6018a590001000001"),
      "nickname" : "superj",
      "provider" : "github",
      "user_hash" : null,
      "watchlists" : [
          {
              "_id" : ObjectId("4f6c42f7018a590001000002"),
              "arrangeable_values" : {
                  "description" : "My introduction presentation to node.js along with sample code at various stages of building a simple RESTful web service with journey, cradle, winston, optimist, and http-console.",
                  "tag" : "",
                  "html_url" : "https://github.com/indexzero/nodejs-intro"
              },
              "avatar_url" : "https://secure.gravatar.com/avatar/d43e8ea63b61e7669ded5b9d3c2e980f?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png",
              "created_at" : ISODate("2011-02-01T10:20:29Z"),
              "description" : "My introduction presentation to node.js along with sample code at various stages of building a simple RESTful web service with journey, cradle, winston, optimist, and http-console.",
              "fork_" : false,
              "forks" : 13,
              "html_url" : "https://github.com/indexzero/nodejs-intro",
              "pushed_at" : ISODate("2011-09-12T17:54:58Z"),
              "searchable_values" : [
                  "description:my",
                  "description:introduction",
                  "description:presentation",
                  "html_url:indexzero",
                  "html_url:nodejs",
                  "html_url:intro"
              ],
              "tags_array" : [ ],
              "watchers" : 75
          },
      {
          "_id" : ObjectId("4f6c42f7018a590001000003"),
          "arrangeable_values" : {
              "description" : "A Backbone alternative idea",
              "tag" : "",
              "html_url" : "https://github.com/maccman/spine.todos"
          },
          "avatar_url" : "https://secure.gravatar.com/avatar/baf018e2cc4616e4776d323215c7136c?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png",
          "created_at" : ISODate("2011-03-18T11:03:42Z"),
          "description" : "A Backbone alternative idea",
          "fork_" : false,
          "forks" : 31,
          "html_url" : "https://github.com/maccman/spine.todos",
          "pushed_at" : ISODate("2011-11-20T22:59:45Z"),
          "searchable_values" : [
              "description:a",
              "description:backbone",
              "description:alternative",
              "description:idea",
              "html_url:https",
              "html_url:github",
              "html_url:com",
              "html_url:maccman",
              "html_url:spine",
              "html_url:todos"
          ],
          "tags_array" : [ ],
          "watchers" : 139
      }
      ]
  }
  </code></pre>