gistfile1.txt

  componentWillMount: function () {
    let dummyImage = 'http://upload.wikimedia.org/wikipedia/en/4/42/Richard_Feynman_Nobel.jpg'
    let userPromises = []
    let clone = _.each(this.state.conversations.slice(), function (conversation) {
      conversation.avatars = []
      _.each(_.keys(conversation.participants), function (key) {
        if (conversation.participants.hasOwnProperty(key)) {
          // Suggestion: Only show avatars for participants who have actively contributed to conversation
          let getAvatar = db.getUser(key).then(function (err, res) {
            if (res.avatar) {
              conversation.avatars.push(res.avatar)
              return
            } else if (err) {
              console.log(err)
            }
          }).catch(function (err) {
            if (err.status === 404) {
              if (conversation.avatars.indexOf(dummyImage) === -1) {
                conversation.avatars.push(dummyImage)
              }
              return
            } else {
              console.log(err)
            }
          })
          userPromises.push(getAvatar)
        }
      })
    })

    Promise.all(userPromises).then(function () {
      this.setState({conversations: clone})
    }.bind(this)).catch(function (err) {
      console.log('Catch promise err', err)
    })
  },