nested query to Parse from client

PlayStore.coffee

fetchCards: () ->
    # Gets 10 random cards from Card class
    Choice = Parse.Object.extend 'Choice'
    Card = Parse.Object.extend 'Card'
    cardQuery = new Parse.Query Card
    cardQuery.limit 10
    cardQuery.find
      success: (cards) =>
        choiceQuery = new Parse.Query Choice
        done = 0
        for j in [0..cards.length-1]
          @_game[cards[j].id] = { question: cards[j].get('question'), choices: null }
          choiceQuery.equalTo 'cardId', cards[j].id
          choiceQuery.find
            success: (choices) =>
              pChoices = []
              for i in [0..choices.length-1]
                pChoices.push { id: choices[i].id, text: choices[i].get('text'), image: choices[i].get('image')}
              @_game[choices[0].get('cardId')].choices = pChoices
              if done is cards.length-1
                @emit Constants.stores.CHANGE
              else
                done++
            error: (error) ->
              console.log "Error fetching choices: " + error.code + " " + error.message
      error: (error) ->
        console.log "Error fethcing cards: " + error.code + " " + error.message
    return