Now that Parse has shut down, and developers are looking for alternatives, here’s a quick proof of concept called Farse I wrote a while back. It’s a service clone, which leverages Objective C’s Key-Value coding and the Apache Software Foundation’s project Solr to model a schema-less, nosql database with rest api and iOS client library. (The Parse service offered quite a bit more than this, such as push messaging and server-side code execution, which Farse doesn’t address)
When I first saw Parse, Solr immediately came to mind as it provides the schema-less database and REST api out of the box. It seemed to me that one could create the client side using the “modern” objective c concept of object subscripting to create fields ‘on-the-fly’ which could be serialized to and from Solr / json.
If you’re interested in building your own Parse service clone, I present this as one way to start.