Denormalized Relation - infinite loop bug?

gistfile1.coffee

Utils.getDescendantProp = (obj, desc)->
  arr = desc.split(".")

  first = arr[0]
  while arr.length and obj[first]
    obj = obj[first]
    first = arr.shift()
  return obj

Schemas.buildDenormalizedRelation = (collection,fields,pk,fk)->
  pk = pk ? '_id'
  fk = fk ? '_id'
  schema = {}
  selectWidget = 'select2'

  schema[fk] = {
    type: String
    regEx: SimpleSchema.RegEx.Id
    autoform:
      type: selectWidget
      options: ->
        collection.find({}).fetch().map((doc)->
          label: fields.map((field)->"#{Utils.getDescendantProp(doc,field)} ").reduce(Reduce.sum)
          value: doc[pk]
        )
  }
  fields.forEach((field)->
    schema[field] = {
#TODO: Figure out how to get correct datatype from remote collection schema
      type: Utils.getDescendantProp(collection.simpleSchema()?._schema ? {},field)?.type ? String
      autoform:
        omit: true
      autoValue: ->
        doc_id = this.siblingField(fk).value
        if doc_id
          refDoc = collection.findOne({_id: doc_id})
          return Utils.getDescendantProp(refDoc,field)
    }
  )
  new SimpleSchema schema