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function unixTimestampSeconds() {
  return Math.floor(Date.now() / 1000);
}

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function messageData () {
  var fiveHoursAgo = unixTimestampSeconds() - 5 * 60 * 60;
  return Messages.find({unixTimestamp: {$gte: fiveHoursAgo}});
}

function userData () {
  return Meteor.users.find({}, {fields: {'status.online': 1, username: 1}});
}

if (Meteor.isServer) {

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// In `meteor shell`:

> new Mongo.Collection("messages")
Error: A method named '/messages/insert' is already defined
    at packages/ddp/livedata_server.js:1461:1
    at Function._.each._.forEach (packages/underscore/underscore.js:113:1)
    at [object Object]._.extend.methods (packages/ddp/livedata_server.js:1459:1)
    at [object Object].Mongo.Collection._defineMutationMethods (packages/mongo/collection.js:904:1)
    at new Mongo.Collection (packages/mongo/collection.js:209:1)
    at [object Object].ns.Collection (packages/lai:collection-extensions/collection-extensions.js:71:1)

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> Rooms.findOne({name: 'linux'})
{ _id: 'QrBSYEy4PQL9e6svb',
  name: 'linux',
  unixTimestamp: 1428397795,
  joinedUsers: [ 'JNkrbokz2393fLDjg' ] }
> Rooms.findOne({name: "doesn't exist"})
> x = Rooms.findOne({name: "doesn't exist"})
> x
> 

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  Template.body.helpers({
    messages: function () {
      return Messages.find({room: $('#joined-rooms').val()});
    }
  });

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<template name="joinedRoomsList">
  <select id="joined-rooms">
    {{#each joinedRooms}}
      <option>{{name}}</option>
    {{/each}}
  </select>
</template>

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if (Meteor.isServer) {
  function onlineUsers () {
    return function () {
      return Meteor.users.find({'status.online': true}, {fields: {'status.online': 1, username: 1}});
    }   
  }
  
  Meteor.publish("onlineUsers", onlineUsers);
}

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  <section id="users">
    {{#with room}}
      {{#each joinedUsers}}
        <div class="user">{{this}}</div>
      {{/each}
    {{/each}}
  </section>

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<template name="roomsList">
  <div class="modal fade">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <h4 class="modal-title">Rooms List</h4>
        </div>
        <div class="modal-body">
          <table>
            {{#each rooms}}

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    'click #join-room': function (event) {
      bootbox.prompt("Enter the name of the room you want to join.", function(roomName) {
        if (roomName !== null) {
          joinRoom(roomName);
          $('#joined-rooms').val(roomName); // this is the line that isn't working.
        }
      });
    },