data wrapper

layer.coffee

Layer =
  
  getCollections: (callback) ->
    collections = db.extractCollections()
    return callback(collections) if collections.length
    
    API.getCollections
      success: (data) ->
        collections = db.saveAndGetCollections data
        callback(collections)
        
      error: ->
        callback(null)
        

# Sample usage:
Layer.getCollections (collections) ->
  console.log collections