app/assets/javascripts/backbone/models/chat.js.coffee
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 class Xmpp.Models.Chat extends Xmpp.Models.Model
   namespace: 'app.chat'
 
   defaults:
     who: null
     withWhom: null
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     chatId: null
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   initialize: ->
     _.bindAll(this)
 
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     App.Com.openNewChatId(@get('who').get('jid'), @get('withWhom').get('jid'), this)
 
   setChatId: (id) ->
     App.debug ['chat has id', id]
     @set('chatId', id)
 
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 class Xmpp.Collections.ChatsCollection extends Backbone.Collection
   model: Xmpp.Models.Chat
 
   initialize: ->
     _.bindAll(this)
 
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     Backbone.Events.on('closeChat', (tab, chat) =>
       @removeChat(chat)
     )
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   find: (who, withWhom) ->
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     _.find(@models, (chat) ->
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       chat.get('who') == who && chat.get('withWhom') == withWhom
     )
 
   removeChat: (chat) ->
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     @models = _.without(@openedChats, chat)