In order to keep this consistent with the website form, can you add the userId as something like "submitterId" to the attributes hash? It would look something like `postObj.attributes.submitterId = {{ userId }}` (just make sure `postObj.attributes` has been initialized first) then we can just save the username/realname as both being `displayname`

We really should probably merged those fields into the same thing, but for the time being, they're just a PITA.