ember-data override to rev attributes when null. data source (couchdb) doesn't want a null rev attribute when adding (POSTing) a record.

gistfile1.txt

    //Override is to accomidate couchdb and that it doesn't like like to see a revision or rev
    //when creating a record.  But because our model contains a rev (which is used for updates 
    //or patch request) we need to make sure during a POST request that we cut or remove the rev 
    //property out of the payload. Since Ember-Data sets it to null (record is about to be added) 
    //removing it won't hurt a thing.
    
    serialize(snapshot, options) {
        let data = this._super(...arguments);
        if (data.data.attributes.rev === null) {
          delete data.data.attributes.rev;
        }
      return data;
    },